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83-652: The LAX West Intermodal Transportation Facility (also known as the West ITF or the LAX Economy Parking facility ) is a large parking structure with a park and ride area and access to the LAX City Bus Center and nearby hotels. The four-story, 1,700,000 square feet (160,000 m) facility cost US$ 294.1 million to build and opened on October 19, 2021. Construction on the West ITF began in summer of 2019 with

166-467: A corrosion -inhibiting grease , usually lithium based. Anchorages at each end of the tendon transfer the tensioning force to the concrete, and are required to reliably perform this role for the life of the structure. Unbonded post-tensioning can take the form of: For individual strand tendons, no additional tendon ducting is used and no post-stressing grouting operation is required, unlike for bonded post-tensioning. Permanent corrosion protection of

249-554: A multistorey , parking building , parking structure , parkade (mainly Canadian ), parking ramp , parking deck , or indoor parking , is a building designed for car, motorcycle and bicycle parking in which parking takes place on more than one floor or level. The first known multistorey facility was built in London in 1901 and the first underground parking was built in Barcelona in 1904 (see history ). The term multistorey (or multistory)

332-584: A 1975 marine vessel was transformed into a floating pontoon multi-storey car parking facility. The ship was given the new name P-Arken (a pun on the words park and ark ) and it is permanently towed in Gothenburg 's harbour Lilla Bommen near Skeppsbron . In November 2019, a fully-clad parking barge for automobiles was patented in the United States. Its angular sides are designed to protect against driving wind, rain, and debris. In October 2009,

415-508: A broad range of structural, aesthetic and economic requirements. Significant among these include: a minimum number of (intrusive) supporting walls or columns; low structural thickness (depth), allowing space for services, or for additional floors in high-rise construction; fast construction cycles, especially for multi-storey buildings; and a low cost-per-unit-area, to maximise the building owner's return on investment. The prestressing of concrete allows "load-balancing" forces to be introduced into

498-639: A fourth-floor section failed at the Centergy building in midtown Atlanta , pancaking down and destroying more than 30 vehicles but injuring no-one. In December 2007, a car crashed into the wall of the deck at the SouthPark Mall in Charlotte, North Carolina , weakening it and causing a small collapse which destroyed two cars below. On the same day, one under construction in Jacksonville, Florida collapsed as concrete

581-591: A groundbreaking on July 11, 2019. The West ITF opened to the public on October 19, 2021, and will temporarily use buses to transport customers between the airport and the facility. In 2022, Los Angeles World Airports' Security & Badging Office moved into a 26,000-square-foot (2,400 m) space on the ground floor. The APM is expected to operate 24 hours a day. During peak hours (9 a.m. to 11 p.m.) trains will arrive every two minutes. Multistorey car park A multistorey car park ( Commonwealth English ) or parking garage ( American English ), also called

664-503: A hallmark of zoning and planning codes for municipalities in the US. (States do not prescribe parking requirements, while counties and cities can). The earliest known multi-storey car park was opened in May 1901 by City & Suburban Electric Carriage Company at 6 Denman Street, central London. The location had space for 100 vehicles over seven floors, totaling 19,000 square feet. The same company opened

747-508: A larger building, often underground as part of the basement, such as the parking lot at the Atlantic Station redevelopment in Atlanta . This saves land for other uses (as opposed surface parking), is cheaper and more practical in most cases than a separate structure, and is hidden from view. It protects customers and their cars from weather such as rain, snow, or hot summer sunshine that raises

830-476: A man was killed during a robbery in the parking garage at The Mall at Short Hills in Millburn, New Jersey . The paramedics responding to the shooting were delayed because their ambulance was too large to enter the structure. In the United States, costs for parking garages are estimated to cost between $ 25,000 per space, with underground parking costing around $ 35,000 per space. Parking structures are subjected to

913-513: A number of regional terms: Architects and structural engineers in the USA are likely to call it a parking structure since their work is all about structures and since that term is the vernacular in the United States. When constructed as the base of a high-rise, it is sometimes called a parking podium . United States building codes use the term open parking garage to refer to a structure designed for car storage that has openings along at least 40% of

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996-597: A parking garage. When the Capital Garage in Washington, D.C. was built in 1927, it was reportedly the largest parking structure of its kind in the country. It was imploded in 1974. The movement of vehicles between floors can take place by means of: Where the car park is built on sloping land, it may be split-level or have sloped parking. Many parking structures are independent buildings dedicated exclusively to that use. The design loads for car parks are often less than

1079-482: A parking structure under construction at a campus of Miami-Dade College in Florida collapsed, purportedly due to an unfinished column. The Surfside condominium's main building's collapse that killed ninety-eight people was likely caused by the failure of the long-term degradation of reinforced concrete structural support in the basement-level parking garage. As multi-storey car parks have become more common since

1162-609: A proof-loaded, redundant and monitorable pressure-containment system. Nuclear reactor and containment vessels will commonly employ separate sets of post-tensioned tendons curved horizontally or vertically to completely envelop the reactor core. Blast containment walls, such as for liquid natural gas (LNG) tanks, will normally utilize layers of horizontally-curved hoop tendons for containment in combination with vertically looped tendons for axial wall pre-stressing. Heavily loaded concrete ground-slabs and pavements can be sensitive to cracking and subsequent traffic-driven deterioration. As

1245-419: A protective sleeve or duct which is either cast into the concrete structure or placed adjacent to it. At each end of a tendon is an anchorage assembly firmly fixed to the surrounding concrete. Once the concrete has been cast and set, the tendons are tensioned ("stressed") by pulling the tendon ends through the anchorages while pressing against the concrete. The large forces required to tension the tendons result in

1328-620: A railway bridge constructed 1946 in the UK . By the 1960s, prestressed concrete largely superseded reinforced concrete bridges in the UK, with box girders being the dominant form. In short-span bridges of around 10 to 40 metres (30 to 130 ft), prestressing is commonly employed in the form of precast pre-tensioned girders or planks. Medium-length structures of around 40 to 200 metres (150 to 650 ft), typically use precast-segmental, in-situ balanced-cantilever and incrementally-launched designs . For

1411-508: A result, prestressed concrete is regularly used in such structures as its pre-compression provides the concrete with the ability to resist the crack-inducing tensile stresses generated by in-service loading. This crack-resistance also allows individual slab sections to be constructed in larger pours than for conventionally reinforced concrete, resulting in wider joint spacings, reduced jointing costs and less long-term joint maintenance issues. Initial works have also been successfully conducted on

1494-511: A second location in 1902 for 230 vehicles. The company specialized in the sale, storage, valeting, and on-demand delivery of electric vehicles that could travel about 40 miles and had a top speed of 20 miles per hour. The earliest known parking garage in the United States was built in 1918 for the Hotel La Salle at 215 West Washington Street in the West Loop area of downtown Chicago, Illinois. It

1577-532: A significant permanent compression being applied to the concrete once the tendon is "locked-off" at the anchorage. The method of locking the tendon-ends to the anchorage is dependent upon the tendon composition, with the most common systems being "button-head" anchoring (for wire tendons), split-wedge anchoring (for strand tendons), and threaded anchoring (for bar tendons). Tendon encapsulation systems are constructed from plastic or galvanised steel materials, and are classified into two main types: those where

1660-503: A single tendon duct, with the exception of bars which are mostly used unbundled. This bundling makes for more efficient tendon installation and grouting processes, since each complete tendon requires only one set of end-anchorages and one grouting operation. Ducting is fabricated from a durable and corrosion-resistant material such as plastic (e.g., polyethylene ) or galvanised steel, and can be either round or rectangular/oval in cross-section. The tendon sizes used are highly dependent upon

1743-447: A vehicle's interior temperature to extremely high levels. Underground parking of only two levels was considered an innovative concept in 1964, when developer Louis Lesser developed a two-level underground parking structure under six 10-storey high-rise residential halls at California State University, Los Angeles , which lacked space for horizontal expansion in the 176-acre (0.71 km ) university. The simple two-level parking structure

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1826-632: Is Mall of America in Bloomington, Minnesota , USA, which has two large parking lots attached to the building, at the eastern and western ends. A common position for parking within shopping centers in the UK is on the roof, around the various utility systems, enabling customers to take lifts straight down into the center. Examples of such are The Oracle in Reading and Festival Place in Basingstoke . Parking garages without mixed use can provide excellent uses for

1909-592: Is a highly versatile construction material as a result of it being an almost ideal combination of its two main constituents: high-strength steel, pre-stretched to allow its full strength to be easily realised; and modern concrete, pre-compressed to minimise cracking under tensile forces. Its wide range of application is reflected in its incorporation into the major design codes covering most areas of structural and civil engineering, including buildings, bridges, dams, foundations, pavements, piles, stadiums, silos, and tanks. Building structures are typically required to satisfy

1992-465: Is a multi-storey car park structure with a ground floor and 5 floors above that, i.e. a total of 6 floors. The preceding does not apply to the United States where B+x refers to basement levels ascending in number x while descending in elevation, L1 or ground level [unlike European standards where ground level is below Level 1] with added levels as L2, etc. Structure car parks are car parks made of structural steel components connected to each other to carry

2075-566: Is almost never used in the US, because almost all parking structures have multiple parking levels. Parking structures may be heated if they are enclosed. Design of parking structures can add considerable cost for planning new developments, with costs in the United States around $ 28,000 per space and $ 56,000 per space for underground (excluding the cost of land), and can be required by cities in parking mandates for new buildings. Some cities such as London have abolished previously enacted minimum parking requirements. Minimum parking requirements are

2158-418: Is fed into a greasing chamber and then passed to an extrusion unit where molten plastic forms a continuous outer coating. Finished strands can be cut-to-length and fitted with "dead-end" anchor assemblies as required for the project. Both bonded and unbonded post-tensioning technologies are widely used around the world, and the choice of system is often dictated by regional preferences, contractor experience, or

2241-589: Is generally not recommended to use automated car parks for high peak hour volume facilities. Additional factors that need to be taken into consideration are: Automotive factories and car dealerships often use automated car parks to store inventory, which makes best use of space if they operate in urban areas, plus the car park may be decorated to promote the brand. For instance at the Autostadt there are two 60 meter/200 ft tall glass silos (AutoTürme) used as storage for new Volkswagens. The two towers are connected to

2324-580: Is measured in cars per level square footage [car count/level area]. Common structural systems in the United States for long-span structures are prestressed concrete double-tee floor systems, post-tensioned cast-in-place concrete floor systems or short-span podium parking with post-tensioned slabs and drop panels [drop heads. Steel embeds or thicker slabs can eliminate the need for drop panels, providing higher clearances for higher profile vehicles.] In recent times, parking structures built to serve residential and some business properties have been built as part of

2407-423: Is most commonly used for the fabrication of structural beams , floor slabs , hollow-core slabs, balconies , lintels , driven piles , water tanks and concrete pipes . Post-tensioned concrete is a variant of prestressed concrete where the tendons are tensioned after the surrounding concrete structure has been cast. The tendons are not placed in direct contact with the concrete, but are encapsulated within

2490-404: Is no need for an energy-intensive ventilating system , since cars are not driven inside and human cashiers or security personnel may not be needed. For naturally ventilated car parks structures, the ventilation equipment is not needed. Automated car parks rely on similar technology to that used for mechanical handling and document retrieval. The driver leaves the car in an entrance module, and it

2573-557: Is on its third edition, written by prominent staff of Walker Parking Consultants, a preeminent Parking Structure designer in the US. Prestressed concrete This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service. Tendons may consist of single wires , multi-wire strands or threaded bars that are most commonly made from high-tensile steels , carbon fiber or aramid fiber . The essence of prestressed concrete

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2656-683: Is reserved for the disabled; above every parking space), indoor positioning system (IPS), including QR code , and mobile payment options. The Santa Monica Place shopping mall in California has cameras on each stall that can help count the lot occupancy and find lost cars. Online booking technology service providers have been created to help drivers find long-term parking in an automated manner, while also providing significant savings for those who book parking spaces ahead of time. They use real-time inventory management checking technology to display car parks with availability, sorted by price and distance from

2739-428: Is that once the initial compression has been applied, the resulting material has the characteristics of high-strength concrete when subject to any subsequent compression forces and of ductile high-strength steel when subject to tension forces . This can result in improved structural capacity and/or serviceability compared with conventionally reinforced concrete in many situations. In a prestressed concrete member,

2822-459: Is the most popular structural material for bridges, and prestressed concrete is frequently adopted. When investigated in the 1940s for use on heavy-duty bridges, the advantages of this type of bridge over more traditional designs was that it is quicker to install, more economical and longer-lasting with the bridge being less lively. One of the first bridges built in this way is the Adam Viaduct ,

2905-486: Is the protection afforded to the end-anchorage assemblies of unbonded tendons or cable-stay systems, as the anchorages of both of these are required to retain the prestressing forces. Failure of any of these components can result in the release of prestressing forces, or the physical rupture of stressing tendons. Modern prestressing systems deliver long-term durability by addressing the following areas: Several durability-related events are listed below: Prestressed concrete

2988-401: Is then transported to a parking slot by a robotic trolley . For the driver, the process of parking is reduced to leaving the car inside an entrance module. At peak periods a wait may occur before entering or leaving, because loading passengers and luggage occurs at the entrance and exit rather than at the parking stall. This loading blocks the entrance or exit from being available to others. It

3071-473: Is typically higher than conventional car park structures, however, this can be offset by the higher space efficiency including reduced excavation waste from minimized footprints. The cost of the mechanical equipment needed to transport the cars needs to be added to the building cost. In addition, operation and maintenance costs of the mechanical equipment need to be added in order to determine the total cost of ownership. Other costs could be saved, for example, there

3154-417: Is undertaken for three main purposes: to protect the tendons against corrosion ; to permanently "lock-in" the tendon pre-tension, thereby removing the long-term reliance upon the end-anchorage systems; and to improve certain structural behaviors of the final concrete structure. Bonded post-tensioning characteristically uses tendons each comprising bundles of elements (e.g., strands or wires) placed inside

3237-593: Is used in the United Kingdom, Hong Kong, and many Commonwealth of Nations countries, and it is nowadays most commonly spelled without a hyphen. In the United States, the term parking structure is used, especially when it is necessary to distinguish such a structure from the "garage" connected with a house. In some places in North America, "parking garage" refers only to an indoor, often underground, structure. Outdoor, multi-level parking facilities are referred to by

3320-554: The National Building Museum opened an exhibition solely devoted to the study of parking garages and their impact on the built environment. This exhibition, titled House of Cars: Innovation and the Parking Garage , was on view until 11 July 2010. Additional information on the design and building of parking structures can be found in "Parking Structures: planning, design, construction, maintenance, and repair" This resource

3403-714: The Roof area: The Grove Parking Garage is the site for movies on its 8th level roof, The Grand Prix of Long Beach, CA can be viewed from the Roof level of The Aquarium of the Pacific Parking Garage and The Pike Parking Garage (opposite the Queensway Structure) were built with a thickened post-tensioned roof slab to accommodate crowds of people. These parking structures often have low ceiling clearances [7'-2" and 8'-4" for accessible parking], which restrict access by full-size vans and other large vehicles. On 15 December 2013,

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3486-547: The Volkswagen factory by a 700-metre tunnel. When cars arrive at the towers they are carried up at a speed of 1.5 metres per second. The render for the Autostadt shows 6 towers. When purchasing a car from Volkswagen (the main brand only, not the sub-brands) in select European countries, it is optional if the customer wants it delivered to the dealership where it was bought or if the customer wants to travel to Autostadt to pick it up. If

3569-432: The airport. Other recent developments in technology include Vehicles Detection and Count Systems, Point of Sale & Revenue Control Systems, Traffic & Capacity Monitoring Systems, Valet Parking Point of Sale, Management & Revenue Control Systems. These systems help in way finding for parking clients with space availability shown at every turn, space monitoring using retrofit wifi transmitters in each space to update

3652-405: The application, ranging from building works typically using between 2 and 6 strands per tendon, to specialized dam works using up to 91 strands per tendon. Fabrication of bonded tendons is generally undertaken on-site, commencing with the fitting of end-anchorages to formwork , placing the tendon ducting to the required curvature profiles, and reeving (or threading) the strands or wires through

3735-468: The availability of alternative systems. Either one is capable of delivering code-compliant, durable structures meeting the structural strength and serviceability requirements of the designer. The benefits that bonded post-tensioning can offer over unbonded systems are: The benefits that unbonded post-tensioning can offer over bonded systems are: Long-term durability is an essential requirement for prestressed concrete given its widespread use. Research on

3818-425: The choice of converting a surface to parking area irrevocably. They could be used as permanent structures or are conceived as temporary parking facilities for temporary parking demand needs. A number of parking decks have been demounted after a few years – to make room for the development of a permanent structure – and relocated to respond to local parking demand. The earliest use of an automated parking system (APS)

3901-612: The cold-climate areas which use salt for melting snow. These structures are not usually known for their architectural value. As Architectural Record has noted, "In the Pantheon of Building Types, the parking garage lurks somewhere in the vicinity of prisons and toll plazas." The New York Times has labeled parking structures as "the grim afterthought of American design". A handful of structures have received considerable praise for their design, including The term multistorey car park (often abbreviated to multistorey or multistory )

3984-433: The concrete volume (internal prestressing) or wholly outside of it (external prestressing). While pre-tensioned concrete uses tendons directly bonded to the concrete, post-tensioned concrete can use either bonded or unbonded tendons. Pre-tensioned concrete is a variant of prestressed concrete where the tendons are tensioned prior to the concrete being cast. The concrete bonds to the tendons as it cures , following which

4067-404: The concrete wall to form a series of hoops, spaced vertically up the structure. When tensioned, these tendons exert both axial (compressive) and radial (inward) forces onto the structure, which can directly oppose the subsequent storage loadings. If the magnitude of the prestress is designed to always exceed the tensile stresses produced by the loadings, a permanent residual compression will exist in

4150-908: The design and construction of prestressed concrete structures. In the United States, such organizations include the Post-Tensioning Institute (PTI) and the Precast/Prestressed Concrete Institute (PCI). Similar bodies include the Canadian Precast/Prestressed Concrete Institute (CPCI), the UK's Post-Tensioning Association, the Post Tensioning Institute of Australia and the South African Post Tensioning Association. Europe has similar country-based associations and institutions. These organizations are not

4233-438: The development of a foundationless, modular, removable steel car park structure. Parking demand often grows quickly, significantly and sometimes unexpectedly. Modular steel car parks could be the proper solution if the surface area available is not sufficient and can be expanded upward, or whenever it is not feasible to build up a multi-storey parking. The development of the building concept of modular car parks came about by using

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4316-493: The downtown core condominium developments sine the 2010s, due to developers having to meet city-mandated minimum parking space requirements while building on increasingly smaller lots. Modern car parks utilize a variety of technologies to help motorists find unoccupied parking spaces, car location when returning to the vehicle and improve their experience. These include adaptive lighting , sensors and parking space LED indicators (red for occupied, green for available and blue

4399-413: The ducting. Following concreting and tensioning, the ducts are pressure-grouted and the tendon stressing-ends sealed against corrosion . Unbonded post-tensioning differs from bonded post-tensioning by allowing the tendons permanent freedom of longitudinal movement relative to the concrete. This is most commonly achieved by encasing each individual tendon element within a plastic sheathing filled with

4482-426: The durability performance of in-service prestressed structures has been undertaken since the 1960s, and anti-corrosion technologies for tendon protection have been continually improved since the earliest systems were developed. The durability of prestressed concrete is principally determined by the level of corrosion protection provided to any high-strength steel elements within the prestressing tendons. Also critical

4565-399: The end-anchoring of the tendons is released, and the tendon tension forces are transferred to the concrete as compression by static friction . Pre-tensioning is a common prefabrication technique, where the resulting concrete element is manufactured off-site from the final structure location and transported to site once cured. It requires strong, stable end-anchorage points between which

4648-422: The exterior of the structures. In modern construction of the precast modules, there are other features to improve the strength of the structure. An example is to use prestressed strands on post-tensioned concrete for the construction of the shear walls . Another example is the use of carbon-fiber-reinforced polymer to replace steel wire mesh to lighten the load and yield more corrosion resistance especially for

4731-451: The form of post-tensioned anchors drilled into the dam's concrete structure and/or the underlying rock strata. Such anchors typically comprise tendons of high-tensile bundled steel strands or individual threaded bars. Tendons are grouted to the concrete or rock at their far (internal) end, and have a significant "de-bonded" free-length at their external end which allows the tendon to stretch during tensioning. Tendons may be full-length bonded to

4814-556: The heavy and shifting loads of moving vehicles, and must bear the associated physical stresses. Expansion joints are used between sections not only for thermal expansion but to accommodate the flexing of the structure's sections due to vehicle traffic. Parking structures are generally not subject to building inspections after being checked for their initial occupancy permit . Seismic retrofits can be applied where earthquakes are an issue. Some parking structures have partly collapsed, either during construction or years later. In July 2009

4897-622: The internal stresses are introduced in a planned manner so that the stresses resulting from the imposed loads are counteracted to the desired degree. Prestressed concrete is used in a wide range of building and civil structures where its improved performance can allow for longer spans , reduced structural thicknesses, and material savings compared with simple reinforced concrete . Typical applications include high-rise buildings , residential concrete slabs , foundation systems , bridge and dam structures, silos and tanks , industrial pavements and nuclear containment structures . First used in

4980-404: The late nineteenth century, prestressed concrete has developed beyond pre-tensioning to include post-tensioning , which occurs after the concrete is cast. Tensioning systems may be classed as either monostrand , where each tendon's strand or wire is stressed individually, or multi-strand , where all strands or wires in a tendon are stressed simultaneously. Tendons may be located either within

5063-597: The latter is chosen, the Autostadt supplies the customer with free entrance, meal tickets and a variety of events building up to the point where the customer can follow on screen as the automatic elevator picks up the selected car in one of the silos. The car is then transported out to the customer without having driven a single meter, and the odometer is thus on "0". Automated car parks have been popular for multistorey residential buildings in New York City and Paris . In Toronto , automated car parks are gradually catching in

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5146-472: The loads and provide full structural rigidity. Steel is a high-strength material requiring less material than other types of structures like concrete and timber. Steel construction features: The ceiling slab of the steel structure car park is typically made of composite material such as corrugated steel sheets and concrete. The surface of the first-floor parking can be left bare or covered with epoxy or tarmac. Demand, steel features, and innovation have led to

5229-432: The longest bridges, prestressed concrete deck structures often form an integral part of cable-stayed designs . Concrete dams have used prestressing to counter uplift and increase their overall stability since the mid-1930s. Prestressing is also frequently retro-fitted as part of dam remediation works, such as for structural strengthening, or when raising crest or spillway heights. Most commonly, dam prestressing takes

5312-446: The middle of the twentieth century, many constructions of such structures have been using precast concrete to reduce the construction time. The design involves putting parking structure parts together. The parts of precast concrete include multi-storey structural wall panels, interior and exterior columns, structural floors, girders , wall panels, stairs, and slabs. The precast concrete parts are transported using flatbed semi-trailers to

5395-466: The modular assembling method of vertical and horizontal elements (such as columns and beams) Modular car park structures are versatile and can be built in phases or in different sizes and shape. The solution makes it possible to develop a parking structure even in case of particular conditions or constraints, such as archaeological sites or city centres, because it allows: These parking structures are generally demountable and can be relocated to avoid making

5478-549: The office building they serve (50 psf versus 80 [100] psf), leading to long floor spans of 55–65 feet that permit cars to park in rows without supporting columns in between [called long span]. Podium parking below high-rise and mid-rise buildings are often short-span 25–30 feet clear between columns, since office/residential/retail floors above require more support [100 psf per International Building Code]. Columns in short -span structures obstruct row based parking spaces and will be less efficient than long-span designs; parking efficiency

5561-420: The perimeter, as opposed to an enclosed parking garage that requires mechanical ventilation. Natural or mechanical ventilation provides fresh air flow to disperse car exhaust in normal conditions, or hot gas and smoke in case of fire. Typically parking consultants in the UK describe the number of car park floors in terms of "G+x". G stands for ground and x for the number of floors above ground. For example, G+5

5644-438: The sites. The structural floor modules may need to be laid tilted during the transportation in order to cover as large floor area as possible while they can be easily transported on the roadways. The modules are lifted using precast concrete lifting anchor systems at the sites for assembly. Decorations may include using of covers to close the holes in the precast concrete that contains the lifting anchors, and installing facades to

5727-695: The space availability signs and to alert parking management of bottle necks and intervention measures. Revenue Control, Capacity Management, and Valet Point of Sale is a major issue for Office and Retail parking management and is also a means of parking management intervention, where website update the status of all of these issues for exclusive use by management. Irvine Spectrum Center, Irvine CA, with 3 parking structures, uses all of these systems The City of Santa Monica uses Traffic and Capacity Monitoring with its 30 parking structures. Disneyland, in Anaheim CA uses most of these hi-tech solutions on its 8 garages. In 1991,

5810-553: The strands is provided by the combined layers of grease, plastic sheathing, and surrounding concrete. Where strands are bundled to form a single unbonded tendon, an enveloping duct of plastic or galvanised steel is used and its interior free-spaces grouted after stressing. In this way, additional corrosion protection is provided via the grease, plastic sheathing, grout, external sheathing, and surrounding concrete layers. Individually greased-and-sheathed tendons are usually fabricated off-site by an extrusion process. The bare steel strand

5893-579: The structure to counter in-service loadings. This provides many benefits to building structures: Some notable building structures constructed from prestressed concrete include: Sydney Opera House and World Tower , Sydney; St George Wharf Tower , London; CN Tower , Toronto; Kai Tak Cruise Terminal and International Commerce Centre , Hong Kong; Ocean Heights 2 , Dubai; Eureka Tower , Melbourne; Torre Espacio , Madrid; Guoco Tower (Tanjong Pagar Centre), Singapore; Zagreb International Airport , Croatia; and Capital Gate , Abu Dhabi UAE. Concrete

5976-475: The surface of the tendons is critical to the pre-tensioning process, as it determines when the tendon anchorages can be safely released. Higher bond strength in early-age concrete will speed production and allow more economical fabrication. To promote this, pre-tensioned tendons are usually composed of isolated single wires or strands, which provides a greater surface area for bonding than bundled-strand tendons. Unlike those of post-tensioned concrete (see below),

6059-432: The surrounding concrete or rock once tensioned, or (more commonly) have strands permanently encapsulated in corrosion-inhibiting grease over the free-length to permit long-term load monitoring and re-stressability. Circular storage structures such as silos and tanks can use prestressing forces to directly resist the outward pressures generated by stored liquids or bulk-solids. Horizontally curved tendons are installed within

6142-546: The tendon element is subsequently bonded to the surrounding concrete by internal grouting of the duct after stressing ( bonded post-tensioning); and those where the tendon element is permanently de bonded from the surrounding concrete, usually by means of a greased sheath over the tendon strands ( unbonded post-tensioning). Casting the tendon ducts/sleeves into the concrete before any tensioning occurs allows them to be readily "profiled" to any desired shape including incorporating vertical and/or horizontal curvature . When

6225-418: The tendons are stretched. These anchorages form the ends of a "casting bed" which may be many times the length of the concrete element being fabricated. This allows multiple elements to be constructed end-to-end in the one pre-tensioning operation, allowing significant productivity benefits and economies of scale to be realized. The amount of bond (or adhesion ) achievable between the freshly set concrete and

6308-406: The tendons are tensioned, this profiling results in reaction forces being imparted onto the hardened concrete, and these can be beneficially used to counter any loadings subsequently applied to the structure. In bonded post-tensioning, tendons are permanently bonded to the surrounding concrete by the in situ grouting of their encapsulating ducting (after tendon tensioning). This grouting

6391-662: The tendons of pre-tensioned concrete elements generally form straight lines between end-anchorages. Where "profiled" or "harped" tendons are required, one or more intermediate deviators are located between the ends of the tendon to hold the tendon to the desired non-linear alignment during tensioning. Such deviators usually act against substantial forces, and hence require a robust casting-bed foundation system. Straight tendons are typically used in "linear" precast concrete elements, such as shallow beams, hollow-core slabs ; whereas profiled tendons are more commonly found in deeper precast bridge beams and girders. Pre-tensioned concrete

6474-677: The use of precast prestressed concrete for road pavements, where the speed and quality of the construction has been noted as being beneficial for this technique. Some notable civil structures constructed using prestressed concrete include: Gateway Bridge , Brisbane Australia; Incheon Bridge , South Korea; Roseires Dam , Sudan; Wanapum Dam , Washington, US; LNG tanks , South Hook, Wales; Cement silos , Brevik Norway; Autobahn A73 bridge , Itz Valley, Germany; Ostankino Tower , Moscow, Russia; CN Tower , Toronto, Canada; and Ringhals nuclear reactor , Videbergshamn Sweden. Worldwide, many professional organizations exist to promote best practices in

6557-491: The wall concrete, assisting in maintaining a watertight crack-free structure. Prestressed concrete has been established as a reliable construction material for high-pressure containment structures such as nuclear reactor vessels and containment buildings, and petrochemical tank blast-containment walls. Using pre-stressing to place such structures into an initial state of bi-axial or tri-axial compression increases their resistance to concrete cracking and leakage, while providing

6640-610: Was being poured on the sixth floor. In November 2008, the sudden collapse of the middle level of a deck in Montreal was preceded by warning signs some weeks before, including cracks and water leaks. In June 2012, the Algo Centre Mall 's rooftop parking deck collapsed into the building, crashing through the upper level lottery kiosk adjacent to the food court and escalators to the ground floor below, killing two people. In October 2012 four people were killed and nine more injured when

6723-453: Was considered unusual enough in 1964 that a separate newspaper section entitled "Parking Underground" described the parking lot as an innovative "concept" and as "subterranean spaces". In Toronto , a 2,400 space underground parking structure below Nathan Phillips Square is one of the world's largest. Parking which serve shopping centers can be built adjacent to the center for easier access at each floor between shops and parking. One example

6806-399: Was designed by Holabird and Roche. The Hotel La Salle was demolished in 1976, but the parking structure remained because it had been designated as preliminary landmark status and the structure was several blocks from the hotel. It was demolished in 2005 after failing to receive landmark status from the city of Chicago. A 49-storey apartment tower, 215 West, has taken its place, also featuring

6889-655: Was in Paris in 1905 at the Garage Rue de Ponthieu. The APS consisted of a groundbreaking multi-storey concrete structure with an internal elevator to transport cars to upper levels where attendants parked the cars. A 1931 Popular Mechanics article speculated about design for an underground garage where the car is taken to a parking area by a conveyor and then an elevator to shuttles mounted on rails. The total cost of ownership of automated parking needs to be carefully considered. The actual cost of construction of automated car parks

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