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1、济乐高速公路 5 标先张法空心板梁张拉参数计算根据空心板梁钢绞线理论伸长值及最大张拉力应以桥规为计算依据，原则上不采用超张拉。当张拉到 100%控制力时，持荷 5 分钟，在控制力稳定后进行锚固，若出现压力表回走情况，将重新张拉到控制应力，直到稳定为止。现将张拉控制程序说明如下：一、张拉理论伸长量计算根据 2011 年桥规要求，先张法采用一端张拉，另一端固定，其中预应力钢筋张拉控制应力为 0.70 fpk =1302Mpa，即可达到纲绞线强度的 70%；根据出厂材质报告可知弹性模量 Ep=195Gpa；先张法张拉程序：0 。 （拟采用。=0.25con 0.5con 1.0con）con （持荷
2、 5 分钟锚固） ，张拉采用双控，以张拉力为主，伸长量容许误差小于6%。理论伸长量计算公式：L= P*L/ Ap*Ep 式中：P设计张拉力（N）L张拉钢绞线长度（cm）Ap钢绞线截面面积（mm2）Ep钢绞线弹性模量（N/mm2）对于本预制梁场：P=1860*70%*Ap=1302Ap（1）10M、13M 空心板梁：钢绞线下料长度 L=103(台座)- 0.65（张拉端) 2（锚固端) =100.35mAp=140mm2Ep=195GpaL= P*L/Ap*Ep=1302Ap*100.35/Ap*195=670mm（2）16M、20M 空心板梁：钢绞线下料长度 L=89(台座) 1.6（张拉端)
3、 - 1（锚固端) =86.4mAp=140mm2Ep=195GpaL= P*L/ Ap*Ep =1302Ap*86.4/ Ap*195=577 mm伸长值相对误差计算相对误差=（实测值-理论值）/理论值，按6%控制，10M、13M 空心板梁预应力筋实测值合格范围：630710mm；16M、20M 空心板梁预应力筋实测值合格范围：543611mm； 二、先张法预应力空心板梁张拉油压表读数计算式张拉控制应力 con =0.7fpk=1302MPa，单根钢绞线控制张拉力Ng=con Ap=182.28KN，整体控制张拉力为:10m 板梁中梁: Ny=9 根Ng=1640.5KN；10m 板梁边梁:
4、 Ny=11 根Ng=2005KN；13m 板梁中梁: Ny=12 根Ng=2187.3KN；13m 板梁边梁: Ny=13 根Ng=2369.6KN；16m 板梁中梁: Ny=14 根Ng=2551.9KN；16m 板梁边梁: Ny=16 根Ng=2916.5KN；20m 板梁中梁: Ny=18 根Ng=3281KN；20m 板梁边梁: Ny=20 根Ng=3645.6KN；千斤顶与油压表标定一元线性回归方程压力表编号：1911910千斤顶编号：12170#回归方程：P=0.2311F+1.26压力表编号：1911992千斤顶编号：12161#回归方程：P=0.01740F-0.32压力表编
5、号：1911907千斤顶编号：2#回归方程：P=0.01715F+0.22先张法预应力空心板梁单根 s15.2 钢绞线其设计张拉控制力为 182.28KN.一、12170#液压式张拉机（1）压力表 1911910P=0.2311F+1.260.10con =0.2311182.280.10+1.26 =5.47MPa（2）压力表 1811470P=0.2436F+0.050.10con =0.2436182.280.10+0.05 =4.49MPa10m 空心板梁中梁 9 s15.2 钢绞线其设计张拉控制力为 1640.5KN.一、12161#液压式张拉机（1）压力表 1911992P=0.0
6、1740F-0.320.25con =0.017401640.520.25-0.32=3.24MPa0.5con =0.017401640.520.5-0.32=6.81MPa1.0con =0.017401640.521.0-0.32=13.95MPa（2）压力表 1#P=0.01774F+1.010.25con =0.017741640.520.25+1.01=4.64MPa0.5con =0.017741640.520.5+1.01=8.28MPa1.0con =0.017741640.521.0+1.01=15.56MPa二、2#液压式张拉机（1）压力表 1911907P=0.0171
7、5F+0.220.25con =0.017151640.520.25+0.22=3.73MPa0.5con =0.017151640.520.5+0.22=7.25MPa1.0con =0.017151640.521.0+0.22=14.28MPa（2）压力表 1811417P=0.01829F+0.080.25con =0.018291640.520.25+0.08=3.83MPa0.5con =0.018291640.520.5+0.08=7.58MPa1.0con =0.018291640.521.0+0.08=15.08MPa10m 空心板梁边梁 11 s15.2 钢绞线其设计张拉控制
8、力为 2005KN.一、12161#液压式张拉机（1）压力表 1911992P=0.01740F-0.320.25con =0.01740200520.25-0.32=4.04MPa0.5con =0.01740200520.5-0.32=8.4MPa1.0con =0.01740200521.0-0.32=17.12MPa（2）压力表 1#P=0.01774F+1.010.25con =0.01774200520.25+1.01=5.45MPa0.5con =0.01774200520.5+1.01=9.9MPa1.0con =0.01774200521.0+1.01=18.79MPa二、2
9、#液压式张拉机（1）压力表 1911907P=0.01715F+0.220.25con =0.01715200520.25+0.22=4.51MPa0.5con =0.01715200520.5+0.22=8.81MPa1.0con =0.01715200521.0+0.22=17.41MPa（2）压力表 1811417P=0.01829F+0.080.25con =0.01829200520.25+0.08=4.66MPa0.5con =0.01829200520.5+0.08=9.24MPa1.0con =0.01829200521.0+0.08=18.41MPa13m 空心板梁中梁 12
10、 s15.2 钢绞线其设计张拉控制力为 2187.3KN.一、12161#液压式张拉机（1）压力表 1911992P=0.01740F-0.320.25con =0.017402187.320.25-0.32=4.43MPa0.5con =0.017402187.320.5-0.32=9.19MPa1.0con =0.017402187.321.0-0.32=18.71MPa（2）压力表 1#P=0.01774F+1.010.25con =0.017742187.320.25+1.01=5.86MPa0.5con =0.017742187.320.5+1.01=10.71MPa1.0con =
11、0.017742187.321.0+1.01=20.41MPa二、2#液压式张拉机（1）压力表 1911907P=0.01715F+0.220.25con =0.017152187.320.25+0.22=4.90MPa0.5con =0.017152187.320.5+0.22=9.59MPa1.0con =0.017152187.321.0+0.22=18.97MPa（2）压力表 1811417P=0.01829F+0.080.25con =0.018292187.320.25+0.08=5.08MPa0.5con =0.018292187.320.5+0.08=10.08MPa1.0co
12、n =0.018292187.321.0+0.08=20.08MPa13m 空心板梁边梁 13 s15.2 钢绞线其设计张拉控制力为 2369.6KN.一、12161#液压式张拉机（1）压力表 1911992P=0.01740F-0.320.25con =0.017402369.620.25-0.32=4.83MPa0.5con =0.017402369.620.5-0.32=9.98MPa1.0con =0.017402369.621.0-0.32=20.29MPa（2）压力表 1#P=0.01774F+1.010.25con =0.017742369.620.25+1.01=6.26MPa
13、0.5con =0.017742369.620.5+1.01=11.51MPa1.0con =0.017742369.621.0+1.01=22.02MPa二、2#液压式张拉机（1）压力表 1911907P=0.01715F+0.220.25con =0.017152369.620.25+0.22=5.30MPa0.5con =0.017152369.620.5+0.22=10.37MPa1.0con =0.017152369.621.0+0.22=20.53MPa（2）压力表 1811417P=0.01829F+0.080.25con =0.018292369.620.25+0.08=5.4
14、9MPa0.5con =0.018292369.620.5+0.08=10.91MPa1.0con =0.018292369.621.0+0.08=21.75 MPa16m 空心板梁中梁 14 s15.2 钢绞线其设计张拉控制力为 2551.9KN.一、12161#液压式张拉机（1）压力表 1911992P=0.01740F-0.320.25con =0.017402551.920.25-0.32=5.23MPa0.5con =0.017402551.920.5-0.32=10.78MPa1.0con =0.017402551.921.0-0.32=21.88MPa（2）压力表 1#P=0.0
15、1774F+1.010.25con =0.017742551.920.25+1.01=6.66MPa0.5con =0.017742551.920.5+1.01=12.32MPa1.0con =0.017742551.921.0+1.01=23.64MPa二、2#液压式张拉机（1）压力表 1911907P=0.01715F+0.220.25con =0.017152551.920.25+0.22=5.69MPa0.5con =0.017152551.920.5+0.22=11.16MPa1.0con =0.017152551.921.0+0.22=22.1MPa（2）压力表 1811417P=0.01829F+0.080.25con =0.018292551.920.25+0.08=5.91MPa0.5con =0.018292551.920.5+0.08=11.74MPa1.0con =0.018292551.921.0+0.08=23.41MPa16m 空心板梁边梁 16 s15.2 钢绞线其设计张
