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1、T梁预应力钢绞线理论伸长值分段计算T梁预应力钢绞线理论伸长值计算书一、计算依据《T形梁上部构造通用图》YQT-SLT240ZQ-30-1，K0+936浸长1#桥、K2+317浸长2#桥、K4+953马料河桥设计图纸及《公路桥涵施工技术规范》（JTJ041-2000），《混凝土弯梁桥》。二、计算公式1、预应力钢绞线理论伸长值计算公式预应力钢绞线伸长值：ΔL＝(Pp×L)/(Ap×Ep),其中：ΔL－预应力钢绞线伸长值（mm）L－预应力钢绞线计算长度（mm），包括千斤顶工作段长度Ap－预应力钢绞线的截面面积（mm2）Ep
2、－预应力钢绞线的弹性模量（N/mm2）Pp－预应力钢绞线的平均张拉力（N）；按JTJ041－2000《公路桥涵施工技术规范》附录G-8预应力筋平均张拉力的计算2、预应力钢绞线平均张拉力计算公式Pp=P×（1-e-(kx+μθ)）/（kx+μθ）；其中：P－预应力钢束张拉端的张拉力（N）k－孔道每米局部偏差对摩擦的影响系数x－从张拉端至计算截面的孔道长度（m）μ－预应力钢绞线与孔道壁的摩擦系数θ－从张拉端至计算截面的孔道部分切线的夹角之和(rad)3、预应力钢绞线伸长值修正计算公式ΔL’＝(Ap×Ep)/(Ap’×Ep
3、’)×ΔL,其中：Ap－预应力钢绞线的截面面积（mm2）Ep－预应力钢绞线的弹性模量（N/mm2）Ap’－预应力钢绞线的实测截面面积（mm2）Ep’－预应力钢绞线的实测弹性模量（N/mm2）三、设计参数及计算参数的选取预应力筋为φs15.20(7φ5)高强度低松弛预应力钢绞线，设计公称面积Ap＝139mm2，弹性模量为：Ep＝1.95×105Mpa，锚下张拉控制应力：σk＝1395Mpa。N1钢束α竖=7.2890Atpresent,wewouldliketotaketheopportunityofmaintaini
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