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 evaluation report and provide a second opinion regarding repair options and recommendations. No matter what the application, double tees are spanning longer distances and performing at higher levels than ever before. Hey,good article and information given by you for Strength to a Double Tee. Our Double Tees are resistant to deterioration from weather; they posses a natural fire resistance and are well suited for our hurricane prone area. Thank you for the comment Asif. Double Tee-to-Lite Wall . Precast parking garages are an economical solution to cast-in-place concrete or steel construction; however with the cost and schedule benefits during original construction comes the requirement for a higher frequency and attentiveness of maintenance. documents for the parking garage, assisted the owner with bidding the project, and This type of construction was originally intended for buildings and parking garages, but has been integrated into the design of highway structures as well. 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 The cost of maintenance is so much higher on a Precast double tee deck. In Test results showed the resiliency and the safety factor engineered into the design of the precast member. Prestressing tendons are situated in the forms and are stressed prior to casting. The two vertical leg sections are called webs or stems and the horizontal section is known as the deck or flange. The rhythmic thumping of tires while driving through a precast parking garage is a familiar experience of modern life. Structural Peer Review and Design, Preparation parking garage is relatively a  new three-level precast parking garage SEE provided 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). It provides  approximately 330 parking spaces Review load tables, details and specs of Spancrete precast double tees for use in specifications for an upcoming project. Thanks Rex for the inquiry. SEE found out that the same Your email address will not be published. By providing your email address, you are agreeing to receive emails from NPCA. Parking Garages Structures. This home is secure with precast wall and a double garage. The double tee was loaded to service level, 85%, ultimate, 110% and failure. Commonly used for large structures like parking garages, gymnasiums and indoor pool areas, it also is the perfect fit for smaller applications like pedestrian bridges. The double tee to lite wall. Engineers, precasters and students alike gathered in April 2014 at Colorado Precast Concrete in Loveland, Colorado, to find out. 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. 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. typical electrical case double tee . The following PDF diagrams accompany Table 1, above. 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. Although it was deemed failed, the double tee still held together despite nearly triple the calculated service load resting on the surface. T-to-T joint sealants, failed expansion joints, differential elevation between adjacent double-T Inspect bearing pads at ends of precast double tee beams for defects. 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. ramp expansion joint . beam to column. provided double tee to P.I.P. intermediate levels. Fig. Would like to know how much of a camber there is on a 50 foot long and 24 inch in depth double tee? Double tee slabs are resistant to moisture and corrosion. Precast IT‐ Beams, L‐Beams and R‐Beams will be taken off by length in linear feet and piece count. Filed Under: Precast Solutions Magazine, 2014 – Fall, Precast Magazines, Strength to a Double Tee Tagged With: Compressive Strength, prestress, strength, testing. DOUBLE TEES. Photos show the placement of the shoring bearing along the bottom flange. Slabs can be cantilevered at one or both ends for up to 4 times the slab depth. Precast/Pre‐topped Double Tees will be taken off by the top surface area in square feet and piece count. In a building remodel situation where one of the bearing wall needs to be replaced, is there an accepted shoring method that allows for the end bearing condition to be temporarily moved away from the end of the double Tee to allow for wall demolition and rebuild? are technical services engineers with NPCA. We recommended contacting the original contractor to repair the Double Tee-to-Double Tee . Double garage: Short version 33m² - 5,82m wide x 5,66m deep. Repair programs can be designed as phased projects in order to limit the impact of the repair on tenants. Waterproofing membranes can also be used to protect the double tee from water penetration. oversaw the construction. oversaw the construction. Another option is to also contact one of our member engineering services for assistance. We are the only company in the Western Cape that manufactures high quality twin side colour panels in a rustic, broken brick and roman brick finish. Evan Gurley and Kayla Hanson, P.E. Is the full top flange used in the design, or just a portion of it? Here, a 14-story building was placed on top of a garage. He also emailed you directly his response as well. The original evaluation report indicated that some of the double-T flange Parking garages, office buildings, commercial buildings, gymnasiums, pool roofs, food processing plants, paper mills, industrial buildings, and sewage and water treatment plants are all ideal applications. Thank you. changed during the construction to allow emergency fire trucks over the roof deck. Stresscon of Colorado Springs supplied the 10-ft-wide, 60-ft-long double tee for the demonstration. Use of precast elements in frame is possible. The adjacent beams resist this deflection through individual connections located along the joint between the beam flanges. What is the biggest in dimension pre-cast concrete double tee that is available in the market?? Thank you for the comment m.asif khan. Thank you for the comment Fred. 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. double tee to lite wall. Review of the construction documents revealed that the design of the roof deck was High Quality CPCI members supply precast concrete compo-nents certified to the CPCI Certification Program for Structural, Architectural and Specialty Precast changed during the construction to allow emergency fire trucks over the roof deck. • ... tion in a precast parking garage. Double Tee slabs are made with G50 concrete and ½” strands ASTM A416 as standard, each double Tee slab is normally 2400mm wide. (SEE)  was retained to peer review an engineering How much chamber will be in 50’long double tee. clean surface. Parking Garage Footprint - Bay Size: 36 ft. x 60 ft. Sounds like an interesting project you are working on. Double Tees are also used for other long span flooring and roof applications such as athletic facilities and buildings of worship. CECO’s cast-in-place park-ing structures have no joints to jostle your vehicle as you park. 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. with pre-topped double-T decks. ACI 318 – Building Code Requirements for Structural Concrete. Precast concrete garages don’t rely exclusively on shop-fabricated : concrete, however. T-to-T joint sealants, failed expansion joints, differential elevation between adjacent double-T Parking Garage Details. This home has a single garage with 2 extra parking spaces! Precast Columns will be taken off by length in linear feet and piece count. Blakeslee Prestress, Inc. picking a double tee in under 7:30 from pick to final placement. The ground level is slab on grade parking, a small electrical room, and secure bike storage. 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. The problems associated with the garage included concrete delamination, failed they failed. Each double tee’s flange is cantilevered from the stem. Multilevel parking garages or car parks are buildings which are specifically intended to park vehicles. Shear LEADING SUPPLIER OF PRESTRESSED / PRECAST CONCRETE PRODUCTS. A full-size 10DT24+2 double tee (see “Decoding the double tee”) designed for a typical parking garage floor member was load tested to determine performance. We manufacture and install precast concrete walls, paving and other structures; e.g. The design of a prestressed double tee allows the deck to act integrally with the superstructure, as prestressed double tees have a monolithic deck and stem design. (SEE). Spacious Tiled Kitchen ... a kitchen, a lounge , a dining area and a full bathroom. The Double tee slabs are resistant to moisture and corrosion. for customers. 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. Joints in Precast Parking Structures For many years, precast concrete has been a mainstay in the construction of aboveground parking structures. Double T ee Flange Connections – Ana ... that c ommonly perform inspections and evaluations of precast parking garages. Like the name implies, a precast, prestressed double tee resembles two side-by-side capital letter Ts. The problems associated with the garage included concrete delamination, failed parking garage is relatively a  new three-level precast parking garage evaluation report and provide a second opinion regarding repair options and recommendations. V ery nice entrance with a spacious Lounge. 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. Information regarding shoring design can best be found within the ACI 347.2R-05, “Guide for Shoring/Reshoring of Concrete Multistory Buildings.”. flanges, and high chloride levels for both elevated Once the double tees are welded together, the double tee joints are treated and, if applicable, toppings are applied. What happens when 4,400-lb highway barriers are placed on top of a 10-ft-wide, 60-ft-long precast, prestressed concrete double tee? You can find a list by clicking here. When necessary, Double Tee stems can be dapped to reduce depth … House-it prefabricated concrete modular garages are available in various sizes: Single garage: Standard 19m² - 3,06m wide x 6,24m deep. Save my name, email, and website in this browser for the next time I comment. New Brunswick Gateway Transit Village Garage New Brunswick, New Jersey 697 vehicles, 278,000 square feet, 10 levels. Structure Evaluation Engineers, Inc. An NPCA technical services engineer is going to contact you via email to get some more clarification about what specific test you need. However, no explanation was given why 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. surface drainage. Required fields are marked *. standard passenger-car flange connectors were specified and used for both roof and The unique stressing of the precast parking garage required our project manager to develop a creative double … 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. I forward your question to our Technical Services engineers. The original evaluation report indicated that some of the double-T flange © 2021 National Precast Concrete Association. 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. 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. It provides approximately 330 parking spaces for customers. I’d be happy to forward your questions to our Technical Services engineers. Higher durability and sound resistance, including the ability to withstand wind, road salt, earthquakes and even fire. Double Tees are common precast flooring elements for larger projects. structural peer review and condition assessment, prepared the repaired bid Open air stair towers are located along the west side of the structure to provide pedestrian access to each level. decks. connectors immediately and not to allow trucks over the roof until appropriate repairs are done. This compression shortens the lower section of double tee, resulting in upward camber, which counteracts dead loads, live loads and creep deflection. 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