30 米后张法箱梁钢绞线张拉计算书（中跨梁）钢束编号每根长度（cm）钢绞线直径（cm）钢绞线根数张拉吨位（KN）理论 伸长值（cm）10%20%100%103%N1308615.24 4 78.12156.24781.2 804.621.4N2 3089 21.4N3309221.4N4307021.4压力表读数1936 表2.24.522.222.8千斤顶号：1#1957 表2.24.421.822.4千斤顶号：2#张拉顺序：N1 N3 N2 N4后张梁钢绞线伸长值计算钢绞线弹性模量：Ey=1.97×105Mpa Ay=140mm2 Ryb=0.75×1860=1395 Mpa k=0.0015 μ=0.20千斤顶工作长度一端按 50cm 考虑正弯矩钢绞线（中跨梁） 1、N1 束各段长度 ㈠、AB 段(锚固段)为直线段，无摩阻力，x=0.5mPp=P=1395×140=195300N㈡、BC 段为直线段，有摩阻力，x＝1.506m，kx=0.002259PP===195079.6 N㈢、CD 段为曲线段，有摩阻力，θ＝0.0314x＝=0.785mkx=0.0011775kx+uθ=0.0074575PP= ==194354.00 N㈣、DE 段为直线段 x=30.86/2-0.65-1.506-0.785-3.925-0.885=7.679mkx=0.0115125PP = ==193239.5 N㈤、EF 段为曲线段 X==3.925m , θ＝0.08722kx+uθ=0.023332PP = ==191002.6 N㈥、FO 段为直线段，，x＝0.885m，Kx＝0.0013275 N，PP ===190875.9 N计算理论伸长值：△ LAB=PpL/ApEp=195300×0.5/(140×1.97×105)=0.00354m=0.35cm△ LBC=PpL/ApEp=195079.6×1.506/(140×1.97×105)=0.01065m=1.07cm△ LCD=PpL/ApEp=194354×0.785/(140×1.97×105)=0.00553m=0.55cm△ LDE=PpL/ApEp=193239.5×7.679/(140×1.97×105)o箱梁中心线FEDCBA=0.0538m=5.38cm△ LEF=PpL/ApEp=191002.6×3.925/(140×1.97×105)=0.02718m=2.72cm△ LFO=PpL/ApEp=190875.9×0.885/(140×1.97×105)=0.00612m=0.61cm△L 总＝2×（0.35+1.07+0.55+5.38+2.72+0.61） ＝21.4㎝2、N2 束各段长度 ㈠、AB 段(锚固段)为直线段，无摩阻力，x=0.5mPp=P=1395×140=195300N㈡、BC 段为直线段，有摩阻力，x＝1.506m，kx=0.002259PP===195079.6 N㈢、CD 段为曲线段，有摩阻力，θ＝0.0314x＝=0.785mkx=0.0011775kx+uθ=0.0074575PP= ==194354.00 N㈣、DE 段为直线段 x=30.89/2-0.65-1.506-0.785-3.925-2.507=6.072mkx=0.009108PP = ==193471.6 N㈤、EF 段为曲线段 X==3.925m , θ＝0.08722kx+uθ=0.023332PP = ==191232 N㈥、FO 段为直线段，，x＝2.507m，Kx＝0.0037605 N，PP ===190872.9N计算理论伸长值：△ LAB=PpL/ApEp=195300×0.5/(140×1.97×10...
