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Having clean anchor cavities is one of the most important part of getting proper elongations of unbonded post-tensioning tendons. Post-Tension Stressing Tails – side Post-Tension Tendon Stressing Tails Since construction is not the cleanest of jobs, there may be debris inside the PT anchor cavity. A major cause of under-elongations and/or strand-slippage is due to . . . → Read More: The importance of clean anchor cavities Occassionally, the field will encounter a condition where the post-tensioned beam’s CGS (center of gravity of steel) requires several PT beams be installed in the slab. In other words, some PT anchors will not be installed within the web of the beam, but in the flange of the beam. Below are several pictures showing how . . . → Read More: Sweeping beam tendons into the slab The friction-loss calculations are important submittals for post-tensioning tendons. The calculations determine what the tendon’s final force is after short-term and long-term friction losses. The key input parameters for “Long-Term Losses” are as follows: Post-Tensioning System (Unbonded or Bonded) Type of Strand (usually Low-Lax) Ultimate Strength of Strand (usually 270 ksi) Modulus of Elasticity of . . . → Read More: Post Tension Friction-Loss Calculations The following educational presentation is targeted towards General and Concrete Contractors interested in utilizing Post-Tensioned Concrete. . . . → Read More: Informational Presentation about Post-Tensioned Concrete for Contractors |
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