Floor slab design creates longer. Upon information contained within Technical Report 43 ‘Post-tensioned Concrete Floors’. VIBRATION DESIGN OF CONCRETE FLOORS How to evaluate the vibration acceptability of a floor? 6 steps for complete evaluation Step 1. Tendon (cable) tails after tensioning. The cables are pulled to 33,000 pounds, resulting in 8 inches of elongation in a 100-foot cable. Www.avalonstructural.com A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. At each end a PT anchor is located and these are located in pockets embedded into the slab edge. When the strands are stressed, the wires will stretch—about 4 inches for a 50 foot strand—to apply 33,000 pounds of load. Jumpin' Jack features seven stunning game worlds. Quick purchase and direct games download of PC. The biggest totally free game fix & trainer library online for PC. Free jumpin jack free full version pc games download software at UpdateStar - If you loved the classic platform games of yesteryear -- the ones in which a beloved hero would run and jump his way through simple side-scrolling levels on his way to rescue a kidnapped princess -- then you'll enjoy Jumpin' Jack. Jumpin jack game free download. Help Jack rescue his family in the side-scrolling game Jumpin' Jack! Download the free version. About Download Free Games. Recommended by PC World Magazine. Stressing should only be done by qualified workers. After stressing, the tendon is cut off and the pocket in which the anchors are located is filled with grout to protect them from corrosion. Www.vsl.net Larger structural concrete members may also be post-tensioned, especially in bridges and floors and beams in parking structures. The process is very similar to that used for slabs, except on a bigger scale. One interesting difference is that the tendons will often be 'draped' so that they are low at the midpoint of a beam and high at the supports—this places the steel at the point of highest tension where it can keep the concrete held together tightly. With structural members the duct is often grouted full following stressing to bond the strand to the concrete along its entire length—these are called bonded tendons. Unbonded tendons, used in residential slabs, remain free to move within the duct and are protected from corrosion by grease. PT tendon placement and stressing is usually done by companies with certified workers who specialize in this work. Pictures Of Concrete FloorsDecorative Post-Tensioned Concrete Since PT is simply reinforcement, there really aren't any specific decorative applications related to post tensioning. The advantages of PT as noted in the opening page are the lack of cracking (or at least very narrow cracks) and the ability to span farther. PT slabs on ground can be placed and stamped just like with any other concrete slab. Surfaces can be stained or overlaid. The only concern is to always remember not to cut or drill into post-tensioned concrete slabs, since once a tendon has been cut, it is very difficult to repair. Many post-tensioned slabs will be stamped to alert the owner and any renovation contractors that the slab is post tensioned. This cantilevered golf course green is actually a post-tensioned concrete slab. Suncoast Post-Tension There are two groups offering certification specifically related to post-tensioned concrete construction: • Post Tensioning Institute: PTI has certification programs for manufacturing plants and for individuals: • Manufacturing is certified for Unbonded Single Strand Tendon Fabrication Facilities (about 95% of U.S. Production is certified under this program) and Prestressed Concrete Strand manufacturing (this is afairly new program--only 6 plants are certified, all in China). • Individuals must first be certified as Level 1 (fundamentals), then can go for Level 2 (either as an inspector or as an ironworker for bonded post tensioning installation). A new certification for slab-on-ground installer/stressor is in the planning stages. • More information on. Post Tensioned Concrete Institute• Ironworkers Union: Developed by Jim Rogers at Evaluation and Certification Services (publishers of Post Tension Magazine), this program offers two programs, to certify installers of single strand unbonded post-tensioning installers and bonded post-tensioning installers. Rogers says they conducted over 2000 exams in 2007 and are ahead of that pace in 2008. Post Tensioned Concrete DefinitionMost PTI publications are available in both printed hard-copy and digital formats. Digital editions are intended for use by single user only, and have been protected against unauthorized distribution using a proprietary Digital Rights Management (DRM) technology. DRM Copy Protection Electronic versions of PTI publications are digitally protected by by LockLizard. A Safeguard Secure PDF may be copied and shared; however, in order to view the file, a license must be purchased. • A single-user license allows the files to be viewed only on the computer on which the license is activated (other computers on a network will not be able to view the files unless additional licenses are purchased. • Optional 2nd installation license*: Users who would like to use the publication on a second computer (e.g.
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