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在橋梁連續(xù)梁T構(gòu)懸臂施工中，縱向預(yù)應(yīng)力鋼絞線(xiàn)的伸長(zhǎng)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(shí)是否有一段鋼絞線(xiàn)被卡住，部分區(qū)段未達(dá)到張拉應(yīng)力,或者穿素時(shí)，一組鋼絞線(xiàn)互相糾纏了?？椎滥ψ?，混凝土的彈模對(duì)其影響較大ΔL=ΔL2-ΔL1=544mm。鋼絞線(xiàn)在1.05δk時(shí)的量測(cè)伸長(zhǎng)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(xiàn)夾片會(huì)啃鋼絞線(xiàn)，那會(huì)大幅降低拉應(yīng)力，雖然油表讀數(shù)顯示到了設(shè)計(jì)應(yīng)力，但實(shí)際傳遞到鋼絞線(xiàn)上的并沒(méi)有那么多。我們?cè)囘^(guò)很多次,在拉應(yīng)力達(dá)到設(shè)計(jì)值時(shí)，一般凡是伸長(zhǎng)值不夠的鋼束，大部分是因?yàn)閵A片啃鋼絞線(xiàn)。

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(mǎn)足鋼絞線(xiàn)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(xiàn)夾片回縮引起的應(yīng)力損失會(huì)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(xiàn)在使用前要送檢，鋼絞線(xiàn)伸長(zhǎng)量要根據(jù)檢測(cè)報(bào)告上的彈性模量計(jì)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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