腹板中跨中梁20m 分段求出伸长量(梁体一半) △L=Pp*L/(Ay*Ey) Pp=P(1+e-(KL+μθ))/KL+μθ
线段长度 L切线角θ(m)rad摩擦系数 k0.00150.00150.00150.00150.0015摩擦系数 µ0.170.170.170.170.17抗拉强KL+ µθ度 fPk1860.01860.01860.01860.01860.00.030510.002370.028140.030530.01968e-(KL+ µθ)最大张拉应力mpa1370.001370.001370.001370.001370.00张拉控制力 P(N)理论伸长量理论伸长量平均张拉力钢绞线断面积预应力筋弹性模量Ey一端两端Pp(N)Ay(mm2)(MPa)△L(mm)△L(mm)4束(N1)10.4510.087261.5814束(N1)8.870.087260.000000.969950.997630.972250.969930.98051767200.0767200.0767200.0767200.0767200.0755580.8767200.0756509.8755492.9759718.956056056056056019500019500019500019500119500272.311.161.472.472.0145221231451444束(N2)10.4670.0872束(N3)10.3510.02443张拉阶10%20%100%
段应力1372741370(Mpa)
张拉力76.72153.44767.2(KN)
7#千斤2.40254.399520.065顶对应1#油表读数8#千斤2.31724.230719.8415顶对应2#油表读数理论伸长值(mm)1429145
备注直线段曲线段