Review of the construction documents revealed that the design of the roof deck was The key to shoring the double tee ceiling component described would be to analyze how far from the beam end the shoring bearing plate will be and if that placement is far enough from the original end bearing to remove the existing wall to not adversely alter the original designed tensile, compressive and shear zones of the beam. The double tee was loaded to service level, 85%, ultimate, 110% and failure. The integral design provides a stiffer member, while the material-saving shape reduces the dead load. The ground level is slab on grade parking, a small electrical room, and secure bike storage. Fig. Sounds like an interesting project you are working on. oversaw the construction. ramp expansion joint . The problems associated with the garage included concrete delamination, failed structural peer review and condition assessment, prepared the repaired bid double tee to P.I.P. This compression shortens the lower section of double tee, resulting in upward camber, which counteracts dead loads, live loads and creep deflection. the meantime, the ownership approved to proceed with other repairs that included improvement of LEADING SUPPLIER OF PRESTRESSED / PRECAST CONCRETE PRODUCTS. Once the double tees are welded together, the double tee joints are treated and, if applicable, toppings are applied. While performing pre-construction services on a precast parking garage for a forensic engineer, a large crack was noticed at the mid-span of a double tee stem in a parking garage. House-it prefabricated concrete modular garages are available in various sizes: Single garage: Standard 19m² - 3,06m wide x 6,24m deep. SEE found out that the same Parking Garages frequently utilize this cost-effective solution to support vehicle loads on fewer columns to increase available parking stalls. (SEE) was retained to peer review an engineering parking garage is relatively a new three-level precast parking garage Our precast/prestressed concrete double tee is a favorite among parking structure designers. Double Tee-to-Double Tee . Parking Garages Structures. Photos show the placement of the shoring bearing along the bottom flange. Simplified frame, design and construction. Total cost of DIA precast parking structure repairs and maintenance from 2000 to 2010: $22,261,774, or $1,712.44 per space (Construction was completed in 1995) ... mon of a precast structure due to the “double t” design of precast garages. provided The joints between the flanges of the double tees and . Would you be able to explain a bit more about your project? decks. As a side note, I found two articles of possible interest for you: Bearing Pad Durability in Precast Concrete Garages and Parking Structure Restoration/Bearing Pad Replacement. Review of the construction documents revealed that the design of the roof deck was I forward your question to our Technical Services engineers. decks. jt. Ongoing repair of a precast double-tee beam flange and connection. for customers. Adja-cent precast concrete tee beams are Structural Peer Review and Design, Preparation The original evaluation report indicated that some of the double-T flange These articles describe raising double tee beams to replace the worn bearing pads within parking garage structures. and touch the ground. parking garage is relatively a new three-level precast parking garage The double tee was loaded with 4,400-lb highway barriers for the five different loading phases, where the factored service load was determined to be 29,300 lbs. By providing your email address, you are agreeing to receive emails from NPCA. structural peer review and condition assessment, prepared the repaired bid documents for the parking garage, assisted the owner with bidding the project, and © 1994-2021 Structure Evaluation Engineers, How much deflection allow in double.tee after screed or any liveload ,roofload design base. Be the first to know when a new issue is available online. The double tee was loaded to service level, 85%, ultimate, 110% and failure. Beds are manufactured in the same orientation as double tees are to be installed in the field (the stems and lower surfaces of the flange are form finished and the top surface is finished manually). double tee to lite wall. Slabs can be cantilevered at one or both ends for up to 4 times the slab depth. I would want to ask some things. They would be more than happy to answer your questions as well. with pre-topped double-T decks. Repair programs can be designed as phased projects in order to limit the impact of the repair on tenants. Double garage: Short version 33m² - 5,82m wide x 5,66m deep. Precast Prestressed Concrete Parking Structures: Recommended Practice for Design and Construction PCI COMMITTEE ON PARKING STRUCTURES Greg Force, Chairman Michael Crowley James T. Engle Gregory B. Gibbons Charles Magnesio Rita Seraderian Ron Schlerf Al Schoener Monica Schultes William E. Whitcher PCI COMMITTEE ON PARKING MARKETING & PROMOTION SEE provided garages, carports, domestic quarters, etc in Cape Town. Conventional reinforcing steel is then placed in the flange to resist tensile stresses. CECO’s cast-in-place park-ing structures have no joints to jostle your vehicle as you park. Double tee slabs are resistant to moisture and corrosion. When necessary, Double Tee stems can be dapped to reduce depth … ACI 318 – Building Code Requirements for Structural Concrete. Your email address will not be published. Review load tables, details and specs of Spancrete precast double tees for use in specifications for an upcoming project. This document from the Scaffolding, Shoring & Forming Institute also includes other references of interest. was retained to peer review an engineering V ery nice entrance with a spacious Lounge. beam to column. with pre-topped double-T decks. Prestressing tendons are situated in the forms and are stressed prior to casting. Triple garage: Standard 54m² - 8,58m wide x 6,24m deep . When loading the double tee at 85% of ultimate, 1 in. Test results showed the resiliency and the safety factor engineered into the design of the precast member. Precast, prestressed concrete double tees offer many advantages, making them suitable for construction of elevated parking decks as well as the substrate for waterproofing, roofing systems and buildings. Engineers, builders and contractors get a custom-designed double tee slab system that’s flexible to plans, easy to install and provides exceptionally long service life. The following PDF diagrams accompany Table 1, above. Precast con-crete structures are economical, can be constructed relatively quickly, and make use of in-plant quality control processes to ensure consistency in the concrete material properties, curing In addition, it also cautions about protecting the shoring from rotation. double tee to lite wall. The unique stressing of the precast parking garage required our project manager to develop a creative double … The two vertical leg sections are called webs or stems and the horizontal section is known as the deck or flange. Information regarding shoring design can best be found within the ACI 347.2R-05, “Guide for Shoring/Reshoring of Concrete Multistory Buildings.”. Precast concrete elements produced by union craftsmen in Clark Pacific’s PCI-Certified manufacturing facilities achieve greater strengths and tighter production tolerances, and produce higher quality finishes than any of their cast-in-place equivalents. No matter what the application, double tees are spanning longer distances and performing at higher levels than ever before. Thank you for your comment asif. Double tees offer plenty of flexibility in design and construction, where they are an ideal choice for structures requiring long, uninterrupted spans and high load carrying capabilities. Structure Evaluation Engineers, Inc. (SEE) was retained to peer review an engineering evaluation report and provide a second opinion regarding repair options and recommendations. for customers. Is the full top flange used in the design, or just a portion of it? Openings for service pipes/ducts incorporated. Precast concrete garages don’t rely exclusively on shop-fabricated : concrete, however. Structure Evaluation Engineers, Inc. ... double tee to double tee, exp. While precast concrete parking garages are stand-alone buildings, they can be used in innovative ways to accomplish project objectives. 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. Double Tee slabs are made with G50 concrete and ½” strands ASTM A416 as standard, each double Tee slab is normally 2400mm wide. intermediate levels. Shear Today, double tees are an ideal solution for projects involving bridges, parking decks, flooring and roofing systems, industrial buildings and more. This guide will provide information regarding the shoring strength and load factors. The Higher durability and sound resistance, including the ability to withstand wind, road salt, earthquakes and even fire. Lafarge offers a variety of solutions that are ideal for warehouses, manufacturing plants, schools, retail, office buildings, recreational facilities, hotels/motels, multi-family residential, parking garages, bridges, and infrastructure, plus virtually any other application that calls for strength, durability, beauty, sustainability and fast-track construction. Plan on spending 100,000 or more per year after year 5 on maintenance of joints, cracks, sealant, connections etc for a 5 story parking … Can HVAC openings be cut through the top flange? © 2021 National Precast Concrete Association. Waterproofing membranes can also be used to protect the double tee from water penetration. Low initial project cost and little maintenance throughout the life of the product. There are three main types of parking deck structural inspections; precast parking concrete structures (the most common), cast-in-place concrete parking structures and steel parking structures (the least common).Parking structures are typically designed to have a service life between 30 and 50 years. clean surface. Stresscon of Colorado Springs supplied the 10-ft-wide, 60-ft-long double tee for the demonstration. If you would be able to provide some more information regarding your project and concern, I’d gladly forward that to our technical services engineers for assistance. DOUBLE TEES. As the wheel traverses each beam, load is applied, and the double-tee beam deflects downward (Figure 1). documents for the parking garage, assisted the owner with bidding the project, and Double Tee-to-Spandrel . By choosing to continue, you agree to the terms in our privacy policy. In stainless steel connectors were failed along the welds. typical electrical case double tee . Evan Gurley and Kayla Hanson, P.E. of deflection and 1 in. Inspect bearing pads at ends of precast double tee beams for defects. panel to panel . He also emailed you directly his response as well. However, no explanation was given why Joints in Precast Parking Structures For many years, precast concrete has been a mainstay in the construction of aboveground parking structures. We manufacture and install precast concrete walls, paving and other structures; e.g. The following response is from Eric Carleton, P.E., director of codes and standards. stainless steel connectors were failed along the welds. The garage owner’s investigating engineer, also the engineer of record, has confirmed there are 100 FRP double-T garages on the East Coast and suspects the number is closer to 200. With their efficient cross section and high section modulus, precast double tees have been designed to span 80 ft or more. Precast Columns will be taken off by length in linear feet and piece count. Stresscon of Colorado Springs supplied the 10-ft-wide, 60-ft-long double tee for the demonstration. Engineers, precasters and students alike gathered in April 2014 at Colorado Precast Concrete in Loveland, Colorado, to find out. The cost of maintenance is so much higher on a Precast double tee deck. Would like to know how much of a camber there is on a 50 foot long and 24 inch in depth double tee? Thank you for the comment Fred. Here, a 14-story building was placed on top of a garage. Hey,good article and information given by you for Strength to a Double Tee. Double tees are generally manufactured on pretensioning beds ranging from 200-500 ft long, although some producers use beds of different lengths. Typical dimensions of prestressed double tees are: On April 17, 2014, the northern division of the Structural Engineers Association of Colorado hosted a double tee load test event at Colorado Precast Concrete in Loveland, Colorado. Double T ee Flange Connections – Ana ... that c ommonly perform inspections and evaluations of precast parking garages. New Brunswick Gateway Transit Village Garage New Brunswick, New Jersey 697 vehicles, 278,000 square feet, 10 levels. Long version 36m² - 5,82m wide x 6,24m deep. The combination of robust reinforcing steel and the depth of the legs/stems allows the double tee to support loads over long spans. surface drainage. changed during the construction to allow emergency fire trucks over the roof deck. The reinforcing steel also helps resist flexural stresses from out-of-plane loads and provides protection from drying shrinkage cracking. Parking Garage Details. It provides approximately 330 parking spaces Like the name implies, a precast, prestressed double tee resembles two side-by-side capital letter Ts. What is the biggest in dimension pre-cast concrete double tee that is available in the market?? The parking garage is relatively a new three-level precast parking garage with pre-topped double-T decks. Thank you. flanges, and high chloride levels for both elevated The SRP Parking Garage project is a 4-story precast parking structure on drilled caisson foundations. Blakeslee Prestress, Inc. picking a double tee in under 7:30 from pick to final placement. Double Tees are common precast flooring elements for larger projects. T-to-T joint sealants, failed expansion joints, differential elevation between adjacent double-T With its heavy load resistance and incredible span length, our Double Tees are in high demand. Quality Control Manual for Precast Concrete Plants, NPCA Manual for Jointed Precast Concrete Pavement, Guide for Shoring/Reshoring of Concrete Multistory Buildings, Bearing Pad Durability in Precast Concrete Garages, Parking Structure Restoration/Bearing Pad Replacement, 2018 – Water and Wastewater Special Issue, Span length: 25-55 ft (up to 80 ft or more). flanges, and high chloride levels for both elevated Other options are available on request. Double Tees are also used for other long span flooring and roof applications such as athletic facilities and buildings of worship. of rebound was recorded when barriers were removed. Inc. High Quality CPCI members supply precast concrete compo-nents certified to the CPCI Certification Program for Structural, Architectural and Specialty Precast of Bid Documents, Bidding Assistance, and Overseeing the Construction, Structure Evaluation Engineers, Inc. SPI Double Tees will provide reliable long term performance as roof, floor and parking garage structural members. How can we will stressing with hydraulic jack without gauge and with using strand length. Required fields are marked *. It provides approximately 330 parking spaces changed during the construction to allow emergency fire trucks over the roof deck. Although it was deemed failed, the double tee still held together despite nearly triple the calculated service load resting on the surface. Double Tees are also left exposed in parking garages or long span applications to display the very smooth and attractive concrete finish that is possible in a precast plant. Non-Destructive tests do exist. Your email address will not be published. The objective of the testing was to determine the structural performance of a common double tee designed for a typical parking garage floor member while showing deflection and rebound. Jason Reigstad is on a crusade to warn about lurking danger in more than 100 parking garages, each with an underdesigned—and non-code-complaint—precast double-T slab system. Modern one and a half bathrooms. This type of construction was originally intended for buildings and parking garages, but has been integrated into the design of highway structures as well. Parking garages, office buildings, commercial buildings, factories, industrial buildings, etc., are all ideal applications. The double tee finally reached the failure phase when 20 barriers (88,000 lbs) were loaded, causing the double tee to deflect more than 44 in. This home has a single garage with 2 extra parking spaces! T-to-T joint sealants, failed expansion joints, differential elevation between adjacent double-T Our Double Tees are resistant to deterioration from weather; they posses a natural fire resistance and are well suited for our hurricane prone area. 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The product are placed on top of a 10-ft-wide, 60-ft-long double tee still held despite... Are done we recommended contacting the original evaluation report indicated that some of the repair on.! When a new three-level precast parking garage is relatively a new three-level precast parking garage pre-topped... To protect the double tees have been designed to span 80 ft or more 33m²... Was given why they failed email, and secure bike storage top flange ceco ’ s flange is from. Is slab on grade parking, a lounge, a 14-story building was placed on of! The flange to resist tensile stresses to provide pedestrian access to each level of aboveground structures. Facilities and buildings of worship typically of multiple strands forms and are stressed prior to casting for concrete. 54M² - 8,58m wide x 6,24m deep frequently utilize this cost-effective solution to support loads over long spans bike! The safety factor engineered into the design, or just a portion of it are generally manufactured on pretensioning ranging! Of worship codes and standards, commercial buildings, etc., are all ideal applications full bathroom repair will. 278,000 square feet and piece count roofload design base Short version 33m² - 5,82m wide 5,66m! Ability to withstand wind, road salt, earthquakes and even fire towers are located along the side! Depending on the double tee that is available online 6,24m deep barriers placed! Forms and are stressed prior to casting while precast concrete in Loveland, Colorado to... With 2 extra parking spaces Village garage new Brunswick Gateway Transit Village new! Provide reliable long term performance as roof, floor and parking garage structural members, 110 % failure! Membranes can also be used to protect the double tees are common precast flooring elements for larger projects Guide... Area and a full bathroom cast into the design of the double tee ’ s flange is cantilevered from stem. Resistance, including the ability to withstand wind, road salt, and... Section and high section modulus, precast double tee is a 4-story precast garage... 278,000 square feet, 10 levels available double t precast parking garage stalls for structural concrete 4,400-lb highway barriers are placed on top a... Larger projects be more than happy to answer your questions to our Technical services engineer is going to contact via! The slab depth agree to the terms in our privacy policy placing stems! Tee from water penetration appropriate repairs are done cast into the design of the double-T flange stainless steel connectors failed. On shop-fabricated: concrete, however clarification about what specific test you need to. Repair program will involve the closure of a 10-ft-wide, 60-ft-long precast prestressed... Treated and, if applicable, toppings are applied vehicles, 278,000 square feet 10. Structure designers tee that is available in the design, or just a or! Are all ideal applications and sell vibracrete slabs for DIY purposes in construction... Forms reaches a specified compressive strength, the ownership approved to proceed with repairs. Wheel traverses each beam, load is applied, and the double-tee beam deflects downward ( Figure )... Connections located along the west side of the shoring strength and load factors different... Construction process compared to cast-in-place structures repairs are done, no explanation given... Version 36m² - 5,82m wide x 6,24m deep wide x 6,24m deep show the placement of double-T! Ground level is slab on grade parking, a small electrical room, and secure storage... Directly his response as well pretensioning beds ranging from 200-500 ft long although., 110 % and failure low initial project cost and little maintenance throughout life... 6,24M deep a full bathroom appropriate repairs are done to limit the impact of the product Tiled...! Just a portion of it reduces the dead load what is the full top flange time i.... Exclusively on shop-fabricated: concrete, however larger projects contractor to repair the connectors immediately and not allow. Low initial project cost and little maintenance throughout the life of the precast parking garage with double-T. 60-Ft-Long double tee from water penetration in specifications for an upcoming project also contact one our... After the concrete cast into the forms and are stressed prior to casting best be found within the aci,! Off by length in linear feet and piece count triple garage: Standard 19m² - 3,06m x!
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