30米箱梁后张法预应力钢绞线张拉伸长量计算书.doc
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30米箱梁后张法预应力钢绞线张拉伸长量计算书.doc
30米箱梁后张法预应力钢绞线张拉伸长量计算书一、计算公式及参数L=Pp=1、预应力平均张拉力计算公式及参数:L钢绞线一端伸长量(mm)Pp预应力筋平均张拉力(N)P预应力筋张拉端的张拉力(N)X从张拉端至计算截面的孔道长度(m)从张拉端至计算截面的曲线孔道部分切线的夹角之和(rad)k孔道每米局部偏差对摩檫的影响系数,取0.0015预应力筋与孔道壁的摩檫系数,取0.232、预应力筋的理论伸长值计算公式及参数:Pp预应力筋平均张拉力(N)L预应力筋的长度(mm)Ap预应力筋的截面面积(mm2),单根取140 mm2Ep预应力筋的弹性模量(N/ mm2),取2.0×105 N/ mm2(Mpa)在计算一端伸长量时,X=L二、伸长量计算以中跨为例:1、N1束一端的伸长量:(中跨4股)单根钢绞线张拉的张拉力P=0.75×1860×140=195300NX=30.72÷2=15.36m=7.5×÷180=0.131radKX+=0.0015×15.36+0.23×0.131=0.053Pp=P×1-e-( KX+)/( KX+)= 195300×4×(1-e-0.053) ÷0.053=760803.74NL=Pp×L÷(Ap×Ep)= 760859×15360÷(140×4×2.0×105)L=104.3mm扣除10%初应力后L=104.3×(1-10%)=93.90mmN1总伸长量为93.9mm×2=187.80mm2、N2束一端的伸长量:(中跨4股)单根钢绞线张拉的张拉力P=0.75×1860×140=195300NX=30.78÷2=15.39m=7.5×÷180=0.131radKX+=0.0015×15.39+0.23×0.131=0.053Pp =P×1-e-( KX+)/ ( KX+)= 195300×4×(1-e-0.053) ÷0.053=760787NL= Pp×L ÷(Ap× Ep)= 760859×15390÷(140×4×2.0×105)L =104.54mm扣除10%初应力后L=104.54×(1-10%)=94.09mmN2总伸长量为94.09mm×2=188.17mm3、N3束一端的伸长量:(中跨4股)单根钢绞线张拉的张拉力P=0.75×1860×140=195300NX=30.85÷2=15.425m=7.5×÷180=0.131radKX+=0.0015×15.425+0.23×0.131=0.053Pp =P×1-e-( KX+)/( KX+)=195300×4×(1-e-0.053) ÷0.053=760767NL= Pp×L÷(Ap×Ep)=760859×15425÷(140×4×2.0×105)L =104.78mm扣除10%初应力后L=104.79×(1-10%)=94.30mmN3总伸长量为94.31mm×2=188.60mm4、N4束一端的伸长量:(中跨5股)单根钢绞线张拉的张拉力P=0.75×1860×140=195300NX=30.56÷2=15.28m=1.4×÷180=0.024radKX+=0.0015×15.28+0.23×0.024=0.029Pp =P×1-e-(KX+)/ (KX+)= 195300×5×(1-e-0.028) ÷0.028=962696NL= Pp×L ÷(Ap× Ep)= 962696×15280÷(140×5×2.0×105)L =105.07mm扣除10%初应力后L=105.07×(1-10%)=94.56mmN4总伸长量为94.56mm×2=189. 12mm依次计算出边跨梁板的单端伸长量为:N1单端伸长量=93.11mm N2单端伸长量=94.87mmN3单端伸长量=94.78mm N4单端伸长量=95.79mm三、钢绞线的张拉控制应力计算(以中跨N1为例)N1 4股钢绞线:con=0.75×1860×140×4=781.2KN0111号千斤顶张拉、10075122号油表时:千斤顶回归方程:Y=0.0316X+0.9式中:Y油压表读数(MPa) X千斤顶拉力(KN)10%con=78.12 KN时:Y=0.0316X+0.9=0.0316×78.12+0.9=3.37MPa20%con=156.24KN时:Y=0.0316X+0.9=0.0316×156.24+0.9=5.84MPa 100%con=781.2KN时:Y=0.0316X+0.9=0.0316×781.2+0.9=25.6MPa 0112号千斤顶张拉、10075127号油表时:千斤顶回归方程:Y=0.0319X+0.77:式中: Y油压表读数(MPa) X千斤顶拉力(KN)10%con=78.12 KN时:Y=0.0319X+0.77=0.0319×78.12+0.77=3.26MPa20%con=156.24KN时:Y=0.0319X+0.77=0.0319×156.24+0.77=5.75MPa100%con=781.2KN时:Y=0.0319X+0.77=0.0319×781.2+0.77=25.69MPa 30米箱梁(边跨)张拉数据表0111千斤顶 N010075122压力表钢束编号钢绞线数量10%初应力(KN)油表读数(MP)20%应力(KN)油表读数(MP)100%应力(KN)油表读数(MP)伸缩缝端伸长量(mm)连续端伸长量(mm)总伸长量(mm)N1597.654.0195.307.1976.5031.893.1193.90187N2597.654.0195.307.1976.5031.894.8794.09189N3597.654.0195.307.1976.5031.894.7894.30189N4478.123.4156.245.8781.2025.695.7994.561900112千斤顶 N010075127压力表钢束编号钢绞线数量10%初应力(KN)油表读数(MP)20%应力(KN)油表读数(MP)100%应力(KN)油表读数(MP)伸缩缝端伸长量(mm)连续端伸长量(mm)总伸长量(mm)N1597.653.9195.307.0976.5031.993.1193.90187N2597.653.9195.307.0976.5031.994.8794.09189N3597.653.9195.307.0976.5031.994.7894.30189N4478.123.3156.245.8781.2025.795.7994.5619030米箱梁(中跨)张拉数据表0111千斤顶 N010075122压力表钢束编号钢绞线数量10%初应力(KN)油表读数(MP)20%应力(KN)油表读数(MP)100%应力(KN)油表读数(MP)一端伸长量(mm)总伸长量(mm)N1478.123.4156.245.8781.2025.693.90188N2478.123.4156.245.8781.2025.694.09188N3478.123.4156.245.8781.2025.694.30189N4597.654.0195.307.1976.5031.894.781890112千斤顶 N010075127压力表钢束编号钢绞线数量10%初应力(KN)油表读数(MP)20%应力(KN)油表读数(MP)100%应力(KN)油表读数(MP)一端伸长量(mm)总伸长量(mm)N1478.123.3156.245.8781.2025.793.90188N2478.123.3156.245.8781.2025.794.09188N3478.123.3156.245.8781.2025.794.30189N4597.653.9195.307.0976.5031.994.56189