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在橋梁連續梁T構懸臂施工中，縱向預應力鋼絞線的伸長值的影響因素有哪些？

What are the factors affecting the elongation of the longitudinal prestressed steel strand during the cantilever construction of the bridge continuous beam T structure?

張拉時是否有一段鋼絞線被卡住，部分區段未達到張拉應力,或者穿素時，一組鋼絞線互相糾纏了。孔道摩阻，混凝土的彈模對其影響較大ΔL=ΔL2-ΔL1=544mm。鋼絞線在1.05δk時的量測伸長值:  ΔL=ΔL3-ΔL1=575mm

Whether a section of steel strand is stuck at the time of tensioning, part of the section does not reach tensile stress, or when it is worn, a group of strands entangled with each other. The influence of the elastic modulus of the concrete is greater than that of the delta L= Delta L2- Delta L1=544mm. The measurement and elongation value of the steel strand at 1.05 delta K: Delta L= Delta L3- Delta L1=575mm

小心鋼絞線夾片會啃鋼絞線，那會大幅降低拉應力，雖然油表讀數顯示到了設計應力，但實際傳遞到鋼絞線上的并沒有那么多。我們試過很多次,在拉應力達到設計值時，一般凡是伸長值不夠的鋼束，大部分是因為夾片啃鋼絞線。

Be careful that the steel strands will gnaw the steel strand, which will greatly reduce the tensile stress. Although the oil meter reading shows the design stress, there is not much that is actually delivered to the steel strand. We have tried many times when the tensile stress reaches the design value, usually the steel bundles that have not been stretched enough, mostly because the clip is gnawing at the steel strand.

所以在張拉之前，一定要檢查一下限位板的空隙是否滿足鋼絞線夾片在張拉中的自由伸縮量，但空隙也不能太大，否則鋼絞線夾片回縮引起的應力損失會增大，一般要留2mm左右。

So before tensioning, we must check whether the gap of the limit plate meets the free expansion of the steel strands in the tension, but the gap is not too large. Otherwise, the stress loss caused by the shrinkage of the steel strand will increase, and generally it should remain 2mm or so.

還有鋼絞線在使用前要送檢，鋼絞線伸長量要根據檢測報告上的彈性模量計算。

The steel strand should be checked before use, and the elongation of the steel strand should be calculated according to the modulus of elasticity on the test report.

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