25m空心板梁钢绞线伸长量计算书

'25m预制空心板梁钢绞线伸长量计算书桥梁施工二处-4- 25m预制空心板梁一、中跨N1束钢绞线查得N1束钢绞线2束7股下料长度为26.3136m,结合实际情况取N1束钢绞线计算长度为（26.3136-0.7）÷2=12.8068m㈠、10％σK时N1束钢绞线伸长量P=10%×1395×140=19530NPN1=19530×7=136.71KN△L=Pp×L÷Ap×EpPp=P(1-e-(kx+uθ))÷(kx+uθ)=19530×(1-e-(0.0015×12.8068+0.25×4.0×π÷180))÷(0.0015×12.8068+0.25×4.0×π÷180)=19530×0.981890268=19176.3N△L=19176.3×12806.8÷(140×1.95×105)=9mm△L１=9×2=18mm㈡、20％σK时N1束钢绞线伸长量P=20%×1395×140=39060NPN1=39060×7=273.42KN同样方法可计算得△L１＝18×2=36mm㈢、100％σK时N1束钢绞线伸长量P=100%×1395×140=195300NPN1=195300×7=1367.1KN-4- △L=Pp×L÷Ap×EpPp=P(1-e-(kx+uθ))÷(kx+uθ)=195300×(1-e-(0.0015×12..8068+0.25×4.0×π÷180))÷(0.0015×12.8068+0.25×4.0×π÷180)=195300×0.981890268=191763.2N△L=191763.2×12.8068÷(140×1.95×105)=90mm△L１=90×2=180mm一、中跨N2束钢绞线查得N2束钢绞线2束7股下料长度为26.368m,结合我处实际情况取N2束钢绞线计算长度为（26.368-0.7）÷2=12.834m㈠、10％σK时N2束钢绞线伸长量P=10%×1395×140=19530NPN2=19530×7=136.71KN△L=Pp×L÷Ap×EpPp=P(1-e-(kx+uθ))÷(kx+uθ)=19530×(1-e-(0.0015×12.834+0.25×7.0×π÷180))÷(0.0015×12.834+0.25×7.0×π÷180)=19530×0.975511033=19051.7N△L=19051.7×12.834÷(140×1.95×105)=9.0mm-4- △L2=9.0×2=18.0mm㈠、20％σK时N2束钢绞线伸长量P=20%×1395×140=39060NPN2=39060×7=273.42KN同样方法可计算得△L2＝18×2=36.0mm㈡、100％σK时N2束钢绞线伸长量P=100%×1395×140=195300NPN2=195300×7=1367.1KN△L=Pp×L÷Ap×EpPp=P(1-e-(kx+uθ))÷(kx+uθ)=195300×(1-e-(0.0015×12.834+0.25×7.0×π÷180))÷(0.0025×12.834+0.25×7.0×π÷180)=195300×0.975511033=190517.3N△L=190517.3×12.834÷(140×1.95×105)=89.6mm△L2=89.6×2=179mm-4-'