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1、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=1.97105Mpa Ay=140mm2 Ryb=0.751860=1395 Mpa k=0.0015 =0.
2、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 箱梁中心线FEDCBAo、AB段(锚固段)为直线段，无摩阻力，x=0.5mPp=P=1395140=195300N、BC段为直线段，有摩阻力，x1.506m，kx=0.002259PP=195079.6 N、CD段为曲线段，有摩阻力，0.0314x=0.785mkx=0.0011775kx+u=0.0074575PP= =194354.00 N、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 N、EF段为
3、曲线段 X=3.925m , 0.08722kx+u=0.023332PP = =191002.6 N、FO段为直线段，x0.885m，Kx0.0013275 N，PP =190875.9 N计算理论伸长值： LAB=PpL/ApEp=1953000.5/(1401.97105)=0.00354m=0.35cm LBC=PpL/ApEp=195079.61.506/(1401.97105)=0.01065m=1.07cm LCD=PpL/ApEp=1943540.785/(1401.97105)=0.00553m=0.55cm LDE=PpL/ApEp=193239.57.679/(1401.
4、97105)=0.0538m=5.38cm LEF=PpL/ApEp=191002.63.925/(1401.97105)=0.02718m=2.72cm LFO=PpL/ApEp=190875.90.885/(1401.97105)=0.00612m=0.61cmL总2（0.35+1.07+0.55+5.38+2.72+0.61） 21.42、N2 束各段长度 箱梁中心线FEDCBAo、AB段(锚固段)为直线段，无摩阻力，x=0.5mPp=P=1395140=195300N、BC段为直线段，有摩阻力，x1.506m，kx=0.002259PP=195079.6 N、CD段为曲线段，有摩阻力，
5、0.0314x=0.785mkx=0.0011775kx+u=0.0074575PP= =194354.00 N、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 N、EF段为曲线段 X=3.925m , 0.08722kx+u=0.023332PP = =191232 N、FO段为直线段，x2.507m，Kx0.0037605 N，PP =190872.9N计算理论伸长值： LAB=PpL/ApEp=1953000.5/(1401.97105)=0.00354m=0.35cm LBC=P
6、pL/ApEp=195079.61.506/(1401.97105)=0.01065m=1.07cm LCD=PpL/ApEp=1943540.785/(1401.97105)=0.00553m=0.55cm LDE=PpL/ApEp=193471.66.072/(1401.97105)=0.0426m=4.26cm LEF=PpL/ApEp=1912323.925/(1401.97105)=0.0272m=2.72cm LFO=PpL/ApEp=190872.92.507/(1401.97105)=0.01735m=1.74cmL总2（0.35+1.07+0.55+4.26+2.72+1.7
7、4） 21.43、N3 束各段长度 箱梁中心线FEDCBAo、AB段(锚固段)为直线段，无摩阻力，x=0.5mPp=P=1395140=195300N、BC段为直线段，有摩阻力，x1.506m，kx=0.002259PP=195079.6 N、CD段为曲线段，有摩阻力，0.0314x=0.785mkx=0.0011775kx+u=0.0074575PP= =194354.00 N、DE段为直线段x=30.92/2-0.65-1.506-0.785-3.925-4.129=4.465mkx=0.0066975PP = =193704.6N、EF段为曲线段 X=3.925m , 0.08722kx
8、+u=0.023332PP = =191462.3 N、FO段为直线段，x4.129m，Kx0.0061935 N，PP =190870.6N计算理论伸长值： LAB=PpL/ApEp=1953000.5/(1401.97105)=0.00354m=0.35cm LBC=PpL/ApEp=195079.61.506/(1401.97105)=0.01065m=1.07cm LCD=PpL/ApEp=1943540.785/(1401.97105)=0.00553m=0.55cm LDE=PpL/ApEp=193704.64.465/(1401.97105)=0.03136m=3.14cm LE
9、F=PpL/ApEp=191462.33.925/(1401.97105)=0.0272m=2.72cm LFO=PpL/ApEp=190870.64.129/(1401.97105)=0.028576m=2.86cmL总2（0.35+1.07+0.55+3.14+2.72+2.86） 21.44、N4 束各段长度 AO箱梁中心线DCB、AB段(锚固段)为直线段，无摩阻力，x=0.5mPp=P=1395140=195300N、BC段为直线段，无摩阻力，x=30.7/2-0.65-0.73-12.9011.069 mkx=0.0016035PP =195143.5N、CD段为曲线段，有摩阻力，x
10、=0.73m，kx+u=0.002651PP=194885.1 N、DO段为直线段，有摩阻力， x12.901m, kx=0.019352PP =193011.5N计算理论伸长值： LAB=PpL/ApEp=1953000.5/(1401.97105)=0.00354m=0.4cm LBC=PpL/ApEp=195143.51.069/(1401.97105)=0.007564m=0.8cm LCD=PpL/ApEp=194885.10.73/(1401.97105)=0.00515m=0.5cm LDO=PpL/ApEp=193011.512.901/(1401.97105)0.09m=9.0L总(0.4+0.8+0.5+9.0)2=21.4
