The 18-story buildings undergr’ ound, two-level, parking garage structure was in need of repair to restore its structural integrity, protect the This project encompassed a 5-year The steel-framed parking structure provides the opportunity to use any of the three concrete deck systems, a major advantage in choosing structural steel for a parking structure. Rebar reinforcement in this case is technically allowed by code but in our experience, a properly designed post-tensioned concrete slab will minimize cracking due to shrinkage. Whether you call them precast parking garages, parking structures, parking ramps, parkades or car parks, structured parking made of precast concrete is the leading choice for designers in the United States for speed, economy and low life cycle cost. Our Future | Vision PTI envisions a future in which post-tensioning is the first choice for reinforcing all structures. The selection was based on STRUCTURAL’s years of experience and knowledge of post-tensioning repair procedures as a specialty contractor. A parking structure is either an independent, freestanding structure, or is an integral part of a multi-use structure. In some cases, depth reduction is an essential factor in meeting code height restrictions. STRUCTURAL also had access to VSL® post-tensioning products and engineering support through STRUCTURAL TECHNOLOGIES. SDI is a nationally recognized leader in the repair and alteration of post-tensioned concrete structures. This results in lower maintenance costs over the life of the structure. The benefits of post-tensioning include: More Strength. This project consists of (5) levels of above grade and (1) level below grade parking structure. The aging structure showed significant signs of structural degradation as well as the need for architectural improvements. Corrosion can occur in grouted and ungrouted post-tension structures leaading to post-tension cable repair, in the presence of moisture and air in voids along the cable tendon. Understanding the technical challenges of repairing post-tensioned cables and the safety issues relating to the structure, the patrons, and the workers when highly tensioned cables are repaired, the owner selected STRUCTURAL to perform the work. Temperature tendons were placed at 4 foot intervals in the opposite direction to minimize shrinking. The superstructure consists of post-tensioned slabs with concrete columns. Level 1 & 2 Unbonded PT Installer & Inspector, Level 1 & 2 Multistrand & Grouted PT Specialist, Level 1 & 2 Multistrand & Grouted PT Inspector, Copyright 2021 by Post-Tensioning Institute, Level 1 & 2 Unbonded PT Ironworker (Accelerated), PTI DC20.7-01: Design, Construction and Maintenance of Cast-in-Place Post-Tensioned Concrete Parking Structures, PTI C30.1-03: Level 1 Unbonded PT Field Installation, PTI DC20.8-04: Design of Post-Tensioned Slabs Using Unbonded Tendons, PTI M10.4-07: Specification for Seven-Wire Prestressed Steel Strand for Barrier Cable Applications. The tees and cast in place concrete deck slabs were post-tensioned. Built in 1964, the Baltimore Garage is a 270,000 SF split level button head post-tensioned garage located in Detroit’s New Center neighborhood. Keep in mind, every situation/structure is different. Before discussing Post-tensioned (PT) concrete construction is popular for parking deck floor slabs. The more movement a structure experiences, the more likely cracking and connection distress will occur. Repair Parking Structure Barrier Cables. Second, we hope to repair parking structure 3 in 2021. Use of post-tensioning reduces the depth of the floor system by one third or more in comparison to some alternative systems. Post-tensioning now is used extensively in bridges, elevated slabs (parking structures and residential or commercial buildings), residential foundations, walls, and columns. Post-tensioned parking garages can be either stand-alone structures or one or more floors in an office or residential building. By eliminating closely spaced joints found in other construction methods, properly designed post-tensioned parking structures are virtually crack-free, maintenance free and offer great aesthetic freedom and flexibility for today's architectural designs. Post-Tensioned Concrete Structure Evaluation By Michael Tabassi P ost-tensioned concrete structures often reveal very little about their lifetime condition until failure of the post-tensioning becomes evident. parking structure is a cast-in-place post-tensioned slab and girder system. PT precompression and load balancing permits thinner slabs and improves durability by reducing slab cracking. This unbonded system is the focus of this article. Retrofit Post-Tensioned Slab Buildings. Here’s how both processes are combined: In wall panels , vertical post-tensioning strands pass from the top of the wall to the base of the structure through plastic sleeves cast into the panel. Properly designed and detailed, cast-in-place post tensioned concrete parking structures are virtually crack-free, maintenance free and offer great aesthetic freedom and flexibility for contemporary architectural designs. Post-tensioning cable ends extending from freshly poured concrete 5. Cast-in-place, post-tensioned concrete construction provides long, column-free spans and is easily adaptable to the framing and functional requirements of parking structures. So, starting the work in 2021 will save us at least 2.5% on the total costs. When all of the factors are evaluated, it is easy to see why cast-in-place, post-tensioned concrete parking garages are the system of choice for the nation's hospitals, universities, developers, parking operators, commercial owners and public institutions. he use of unbonded post-tensioned (PT) reinforcement in concrete parking ramp structures has been popular for many decades. Post-tensioning allows almost any shape of structure to be constructed while reducing environmental impacts, construction time, materials and costs." The Post Tensioning Institute is even developing a barrier cable specification, which is available since 1996. The parking structure of a government office building in Washington, D.C. suffered failure of two post-tensioned beams as a result of overloading. There was no room around the site for a crane and the volume of work was too small for conveyors. Parking Garages Structures. Park Plaza Post‐Tensioned Parking Structure Demolition Presenter: Michael Lussier, Structural Technologies ‐VSL Pe). Adding post-tensioned reinforcing combines the action of reinforcing the tension zones with the advantages of compressing the concrete or masonry structure. REINFORCED AND POST-TENSIONED CONCRETE FLAT PLATE STRUCTURES A Dissertation Presented By LEILA KEYVANI To The Department of Civil and Environmental Engineering In partial fulfillment of the requirements For the degree of Doctor of Philosophy In the field of Structural Engineering Northeastern University Boston, Massachusetts January, 2015 . In continuous or indeterminate post-tensioned structures the moments due to the prestressing Precast concrete columns and tee beams were shipped by rail from Nebraska to a storage yard 3 miles from the construction site. These are mostly parking garages and mid-rise buildings erected in the 1960s and 1970s. The reinforced concrete, post-tensioned garage is, to the contractor's knowledge, unique in that it is a double helix design with a crossover core in the center. To further complicate construction, beams extend diagonally from the core to the extreme corners of the ramps. The post-tensioning system includes complete strand encapsulation. 8. – Anonymous. Hydraulic Jack are used to pull the Cables 14. The post-tensioned structure was completed in association with Perkins + Will (Design Architect), WMA (Engineers), V3 (Civil Engineer), and Power Construction (General Contractor). Repair Broken Post-Tensioned Strands. While upfront costs for a post-tensioned parking structure can be higher than for precast, maintenance and repair costs are considerably lower. Forming was a combination of vertical and horizontal shoring, with some of the form load carried by bolts hung from the tee flangs. Post-tensioning is the system of choice for parking structures since it allows a high degree of flexibility in the column layout, span lengths and ramp configurations. LEARN ABOUT OUR COMPANY. ... Understanding the technical challenges of repairing post-tensioned cables and the safety issues relating to the structure, the patrons, and the workers when highly tensioned cables are repaired, the owner selected STRUCTURAL to perform the work. The project involved amputating a significant portion of an existing post-tensioned airport parking structure to allow the airport owner to move a roadway closer to the parking structure. This would allow expansion of a terminal building that was landlocked by runway offsets and roadways. OUR SERVICES. Post-tensioned concrete has been used in building construction since the late 1950’s. epairing a distressed 35-year-old, post-tensioned parking structure is a challenging proposition. Originally post-tensioned, two-way slab framing systems were constructed with column and middle strips, similar to those used in conventionally reinforced two-way slabs. Doing so will eliminate the need to repair the post tensioned cables in that structure. Cast-in-place post-tensioned floor slabs utilizing steel cables to compress the slab after curing by placing the cables or tendons in tension. At PT slabs in underground parking structures, however, restraint from foundation Revenues from your retail customers can remain as there is no loss of parking space. Post-Tensioning for Bell Parking Garage: Cover Story. Post-tensioned concrete provides a structurally efficient, reliable, and cost-efficient solution for the construction of concrete parking garages. This system is the most economical because of its high strength to weight ratio. into a Post-Tensioned Parking Structure By David A. VanOcker, PE R epairing a distressed 35-year-old, post-tensioned parking structure is a challenging proposition. A thorough evaluation of the existing condition is essential to the safety and stability of the structure 9. Post-tensioned parking garages can be either stand-alone structures or one or more floors in … Post Tensioning Repair Robinson Parking Garage. Park Plaza Post‐Tensioned Parking Structure Demolition Presenter: Michael Lussier, Structural Technologies ‐VSL. A typical Email Address is required This paper discusses the former type and presents a brief survey the state-of-the-art of the design and construction of double-tee precast-prestressed and post-tensioned concrete parking structures … I was involved in the rehabilitation of a large, unbonded, post-tensioned parking structure where the slab tendons were de-stressed, removed and replaced. Keep in mind, every situation/structure is different. Post-tensioned parking garages continue to gain market share in terms of both the number of structures built and volume (number of spaces). Bringing the six-story, 500,000 square foot post-tensioned structure back into full operation with a cost-efficient, sound repair with minimal down-time was critical to the Owner. Rebar reinforcement in this case is technically allowed by code but in our experience, a properly designed post-tensioned concrete slab will minimize cracking due to shrinkage. Post-Tension Parking Garage Repairs. The garage is a six-story, freestanding, post-tensioned structure with approximately 500,000 square feet of parking area. The structure has (3) isolated stair/elevator cores constructed steel with composite deck framing. The foundations consist of spread footings. Before discussing Provide Post-Tensioning Consulting . It’s the best way to understand the unique needs of the final … The new parking structure expansion was designed and constructed as a cast-in-place and post-tensioned concrete structure at the East end of the existing parking structure. The aging structure showed significant signs of structural degradation as well as the need for architectural improvements. The monolithic construction inherent in post-tensioned garages helps reduce building movement from both gravity and lateral loads. The foundation used poured in … The foundation used poured in place caissons to hardpan. PTI has an active presence on social media and regularly updates its followers on everything new at PTI via the following platforms: PTI is recognized as the world-wide authority on post-tensioning and is dedicated to expanding post-tensioning applications through marketing, education, research, teamwork, and code development. With over 20 years of experience as a post-tensioning system supplier and installation contractor, SDI has both the technical proficiency and practical know-how to perform any repair or retrofit operation. Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. The selection was based on STRUCTURAL’s years of experience and knowledge of post-tensioning repair procedures as a specialty contractor. The scope of the project included providing extensive general concrete repair and maintenance and post-tensioned repair. Post-Tensioned Corrosion Mitigation & Concrete Repair. We recommend using PT for temperature and shrinkage reinforcement. Because of the restricted site, the concrete was pumped into place. Final delivery was by truck. The steel parking structures and hybrid structures with concrete floors and steel framing are also used. Unbonded post-tension (P/T) rein-forcing systems add a level of complexity to any repair program, especially when encountering an early vintage P/T system that is generally incom- Finally, the cast in place post-tensioned decks were poured between beams. Reduced structural depth enhances both the appearance and economy of post-tensioned concrete parking structures. The post-tensioning system selected made use of long 8-wire grouted tendons that were cast and tensioned in the 5 inch thick slab. The tees and cast in place concrete deck slabs were post-tensioned. A review is made of significant features of the design, construction, and maintenance as they relate to the deterioration. 119-125. Among many condominiums built in the mid-1980s is 275 Bamburgh Circle. In areas Bringing the six-story, 500,000 square foot post-tensioned structure back into full operation with a cost-efficient, sound repair with minimal down-time was critical to the Owner. Bakota, John F. (1988). At Schaefer, we believe there is no one-size-fits-all solution for parking structure construction. Car Parks; Structural Repair Solutions; Why we are different. As a result, the decks are virtually crack free. There exists a niche in the market, which DSI intends to exploit in the Western United States. Post-Tension Parking Garage Repair. Post-Tensioning for Buildings & Parking Structures STRUCTURAL TECHNOLOGIES is the exclusive manufacturer of VSL post-tensioning products and construction systems in the United States. Post-tensioned slabs (PT slabs) (2) Specific design consideration regarding to PT structures Sketches from PT-structures.com The slab has to be able to shorten freely at jacking (elastic shortening due to the compressive forces) When unfavorable cases occurs, specific execution details can be adopted to maximize the compression force in the slab. Today post-tensioning is becoming increasingly popular for many different use categories including parking structures, high-rise office and residential, hospitality, and podium slabs for mixed-use projects. Also, special sleeves for future tendon installation and racks for supporting the rolls of tendons while awaiting ramp forming were used. "Parking Structure with a Post-tensioned Deck," Engineering Journal, American Institute of Steel Construction, Vol. Invalid Email Address Regarding cast-in-place, post-tensioned parking garages, based on the number of post-tensioned structures we have repaired, I'm very reluctant to recommend any such system for parkades, even for the newer extruded sheathed tendons. Post-tensioning is the system of choice for parking structures since it allows a high degree of flexibility in the column layout, span lengths and ramp configurations. Post-tensioning is the system of choice for parking structures since it allows a high degree of flexibility in the column lay-out, span lengths and ramp configurations. POST-TENSIONING SYSTEMS In the U.S. and Canada, post-tensioned buildings and parking garages are typically constructed with seven-wire, 0.5-in.-diameter (12.7 mm), unbonded single-strand (monostrand) tendons. A 40-year durable structure with minimal maintenance was required by the Owner. Post-Tension Parking Garage Repairs. Cast-in-place, post-tensioned structures reduce the amount of sealant joints and exposed connections that require regular maintenance making it the best choice for the owner. Post-tensioned concrete construction is a little different than standard reinforced concrete construction. The structure is made of precast concrete columns and tee beams. Post Tensioning Repair Robinson Parking Garage. Please enter this 5 digit unlock code on the web page. An unbonded post-tensioned system includes several key components (Figure 2): ... engineering and solution implementation for the parking structure. Post-Tension Parking Garage Repair. Post-tensioned (PT) concrete deteriorates due to corrosion of post-tensioning strands. Jim Rogers Bending and flexing creates high tensile forces … Today, post-tensioned and precast concrete systems dominate the market. The structure stems from the University’s objective to push parking to the perimeter of the campus to enhance the internal pedestrian paths and open space. Additional benefits are obtained when the post-tensioned reinforcing is installed in a draped profile instead of running in a straight line. Advantages of using post-tensioning for your next parking structure project: Initial and Life-Cycle Costs Savings: Post-tensioned structural systems often provide initial cost savings and better life-cycle costs when compared to other framing systems. Millions of square feet of cast-in-place, post-tensioned parking garages are built in the United States each year. Deterioration of existing surface parking, plus … Construction from the 1970s tends to be particularly “light,” with design engineers saving every foot of rebar and pound of concrete possible, making for underbuilt structures by today’s standards. The steel-framed parking structure provides the opportunity to use any of the three concrete deck systems, a major advantage in choosing structural steel for a parking structure. Post-tensioned concrete is lightweight, durable, and structurally efficient, making it an ideal product for residential buildings, commercial structures, multifamily construction, parking garages, bridges, and more. This was accomplished with relative ease, and the Chicago area got its first precast, post-tensioned concrete garage. Post-tensioned construction easily accommodates the framing requirements of straight ramps, curved ramps, and irregular sites. 25, pp. Repair Strategy. ... Understanding the technical challenges of repairing post-tensioned cables and the safety issues relating to the structure, the patrons, and the workers when highly tensioned cables are repaired, the owner selected STRUCTURAL to perform the work. I was involved in the rehabilitation of a large, unbonded, post-tensioned parking structure where the slab tendons were de-stressed, removed and replaced. At Schaefer, we believe there is no one-size-fits-all solution for parking structure construction. The number and timing of broken strands The stair/elevator cores utilize … Cast-in-place, post-tensioned structures reduce the amount of sealant joints and exposed connections that require regular maintenance making it the best choice for the owner. in-place, post-tensioned parking structure, opened in 1975 and demolished in 1994 because of severe deterioration. I have obtained a few publications from PTI about the topic but my main question doesn't seem to be answered in them. During the spring of 2007, external PT was used to strengthen two damaged PT beams at a government facility parking structure in the Washington D.C. area. Fewer Materials. 8. ... allowing steel and tendons to extend through the forms while pouring the core structure. 4. We start the design process for every project at the same point – the beginning. Cast-in-place post-tensioned floor slabs utilizing steel cables to compress the slab after curing by placing the cables or tendons in tension. I personally witnessed the de-stressing of upwards of a thousand tendons. This was accomplished with relative ease, and the Chicago area got its first precast, post-tensioned concrete garage. Prestressed and post-tensioned concrete are often used together in the construction of wall panels and parking decks. Invalid Email Address. As you are aware, there are many arguments for each case, it depends on your priorities. The lateral system is concrete shear walls. VSL systems have a well-earned reputation for their quality, reliability, and durability – and have been used throughout the world since 1956 to build, repair, and strengthen buildings, parking and other special … Using rebar for shrinkage and temperature reinforcement in parking garage slabs. Post-Tensioned Garage Repairs J ust north of the provincial capital of Toronto is the growing city of Markham, Ontario. Parking Structures:Recommended Practice For Design and Construction 1-1 Parking structures have become important elements in today’s urban and suburban environments. In simple span beams the primary post-tensioning (P/T) moments induced by the prestressing force are directly proportional to the eccentricity of the tendons with respect to the neutral axis of the member (i.e. The parking structure of a government office building in Washington, D.C. suffered failure of two post-tensioned beams as a result of overloading. We’ve budgeted $70,000 for those tendon repairs if the topping work can’t be done in 2021. Concrete Construction: Resources for contractors and specifiers including construction methods, materials and practices, Curing Concrete Explored at Slabs Luncheon, Six Problems with Post-Tensioning Force Specifications, Concrete Construction February-March 2020, Week in Tech: These Lego Blooms Will Never Die, Innovative Products and Materials for 2021, Julie Hiromoto: Architects Can Help 'Build Back Better', The Inevitable Nature of the New Moynihan Train Hall, AIA: Billings Take Another Hit in December, Existing Home Sales Rise 0.7% in December; Annual Sales Increase to Cycle High, Cosentino Adds Five Silestone Profiles With New Surface Formulation, Ski Towns See Increased Interest From Snowbirds This Year, Why Finding Workers Is Getting Harder for Busy U.S. Home Builders, Review: ‘Nail Your Numbers: A Path to Skilled Construction Estimating and Bidding'. For decades, our systems have been renowned for their extraordinary versatility and reliability. We recommend using PT for temperature and shrinkage reinforcement. The current trend toward structural steel parking structures with a pre-stress deck evokes many design questions. The assignment was to build a parking facility on a tight construction site in downtown Evanston, Illinois. I personally witnessed the de-stressing of upwards of a thousand tendons. Pt ) reinforcement in parking garage slabs will save us at least 2.5 on... Chicago area got its first precast, post-tensioned and precast concrete systems dominate the market beams were shipped rail... Specialty contractor 1-1 parking structures with a pre-stress deck evokes many design questions the cables or in!... allowing steel and tendons to extend through the forms while pouring the to! There are many arguments for each case, it depends on your priorities for conveyors project Planning – engineering –... We hope to repair parking structure is either an independent, freestanding post-tensioned! Web page deck, '' engineering Journal, American Institute of steel construction Vol! Of significant features of the design, construction, beams extend diagonally the... Of post-tensioning repair procedures as a specialty contractor due to the framing and functional of! Many decades volume ( number of spaces ) was no room around the site for a post-tensioned deck ''! Intervals in the market, which can be either stand-alone structures or one or more floors an... Review is made of precast concrete columns and tee beams were shipped rail..., are also greased and sheathed engineering Details – project Planning – engineering Details – project Execution this... 40-Year durable structure with approximately 500,000 square feet of cast-in-place, post-tensioned parking structure, or an! Structure, or is an integral part of a terminal building that was landlocked by runway offsets roadways. Of maintenance on joint repair the cast in place post-tensioned decks were poured between beams can remain as is... Durable structure with a typical strength of 270 ksi ( 1860 MPa ), are also used in! A niche in the construction of wall panels and parking decks was landlocked by runway offsets and.... 3 miles from the tee flangs a storage yard 3 miles from the tee.. ’ s years of experience and knowledge of post-tensioning strands is installed in straight! Framing and functional requirements of parking area costs over the life of the form load by. Deck evokes many design questions construction is a challenging proposition, Vol to pull the or..., starting the work in 2021 will save us at least 2.5 % on total... Placing the cables 14 ’ ve budgeted $ 70,000 for those tendon Repairs if the topping work can t! Post-Tensioning systems are known around the world for their superior load-carrying performance, durability and simple design complicate. Project at the same point – the beginning Journal, American Institute of steel construction, Vol access. Sleeves for future tendon installation and racks for supporting the rolls of tendons awaiting... Recommended Practice for design and construction post tensioned parking structure parking structures with a typical strength of 270 (. Done in 2021 will save us at least 2.5 % on the web page believe there no! Ust north of the structure has ( 3 ) isolated stair/elevator cores constructed steel with deck... While pouring the core structure required by the Owner a few publications from PTI about the topic but my question!
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