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设计值差值(mm)(mm)12-131234567891011121314AB5.822000.00150.213951388.92619500041.5BC11.6939.5710.16704550.00150.213951360.05919500081.6CD2.615000.00150.213951392.26819500018.7AB5.086000.00150.213951389.69219500036.2BC11.1469.1230.15922640.00150.213951361.66819500077.8CD3.915000.00150.213951390.91219500027.9AB3.229000.00150.213951391.62719500023.0BC8.85810.150.17715090.00150.213951361.56519500061.8CD8.06000.00150.213951386.60119500057.3AB1.9000.00150.213951393.01419500013.6BC5.51112.6310.22045250.00150.213951359.11019500038.4CD12.633000.00150.213951381.86619500089.55.0切线夹角θ(O)孔道每米局部偏差对摩擦的影响系数k张拉控制应力δcon(Mpa)预应力筋的弹性模量Ep(MPa)284-0.6284.0284.4283.02822802782.04.4各段代号N1N2N3N4283.4说明:两端张拉;θ为从张拉端至计算截面曲线孔道部分的切线夹角之和,AB为锚外+锚内到端部的直线段;BC为竖弯段部分;CD为锚内从竖弯段到中点部分,总伸长值为2*(AB+BC+CD)。梁体一端锚外部分钢束长度包含了限位板厚度6CM,工具锚厚度8CM,千斤顶长度37.5CM,并减去了限位板和工具锚各伸入千斤顶内的3CM和3.5CM;锚外工作长度为45CM。预应力砼T梁中跨N1、N2、N3、N4钢束张拉总伸长值计算表附表1第一页钢束编号平均张拉应力δ=δcon(1-e-(kx+μθ)/(kx+μθ)(MPa)预应力筋与孔道壁的摩擦系数μ锚外部分伸长量△L外=δcon×Li×1000/EP(mm)总伸长量△L=2×(△LAB+△LBC+△LCD)(mm)从张拉端至计算截面的孔道长度x(m)切线夹角和θ(rad)设计值差值(mm)(mm)12-131234567891011121314AB5.241000.00150.213951389.53119500037.3BC12.8278.1660.14252360.00150.213951362.22119500089.6CC’3.041000.00150.213951391.82319500021.7C’B’15.0349.5710.16704550.00150.213951356.686195000104.6B’A’4.171000.00150.213951390.64519500029.7AB4.701000.00150.213951390.09319500033.5BC9.8798.0860.14112730.00150.213951365.40319500069.2CC’9.467000.00150.213951385.14219500067.2C’B’11.1469.1230.15922640.00150.213951361.66819500077.8B’A’5.086000.00150.213951389.69219500036.2AB2.999000.00150.213951391.86719500021.4BC7.2668.3260.14531610.00150.213951367.49419500051.0CC’17.921000.00150.213951376.417195000126.5C’B’8.85810.150.17715090.00150.213951361.56519500061.8B’A’3.229000.00150.213951391.62719500023.0昌江大桥预应力砼T梁边跨N1、N2、N3、N4钢束张拉总伸长值计算表附表1第二页N1284-1.0N2N3284.02831.0283.0283.82812.8预应力筋的弹性模量Ep(MPa)锚外部分伸长量△L外=δcon×Li×1000/EP(mm)钢束编号各段代号从张拉端至计算截面的孔道长度x(m)切线夹角θ(O)切线夹角和θ(rad)平均张拉应力δ=δcon(1-e-(kx+μθ)/(kx+μθ)(MPa)预应力筋与孔道壁的摩擦系数μ总伸长量△L=∑△Li(mm)孔道每米局部偏差对摩擦的影响系数k张拉控制应力δcon(Mpa)设计值差值(mm)(mm)12-131234567891011121314AB3.11000.00150.213951391.75119500022.2BC2.9986.870.11990410.00150.213951375.32419500021.1CC’26.733000.00150.213951367.401195000187.5C’B’5.51112.6310.22045250.00150.213951359.11019500038.4B’A’1.90000.00150.213951393.01419500013.6设计伸长值差值(mm)(mm)12-11123456789101213N10.061111.0600.00150.213951383.492195000771N20.0688.0600.00150.213951386.601195000552N30.061414.0600.00150.213951380.3931950009551178.4757.3199.53昌江大桥预应力砼T梁连续N1、N2、N3钢束张拉总伸长值计算表附表1第三页N4282.82802.8昌江大桥预应力砼T梁边跨N1、N2、N3、N4钢束张拉总伸长值计算表附表1第三页钢束编号各段代号从张拉端至计算截面的孔道长度x(m)切线夹角θ(O)切线夹角和θ(rad)孔道每米局部偏差对摩擦的影响系数k预应力筋与孔道壁的摩擦系数μ张拉控制应力δcon(Mpa)平均张拉应力δ=δcon(1-e-(kx+μθ)/(kx+μθ)(MPa)预应力筋的弹性模量Ep(MPa)锚外部分伸长量△L外=δcon×Li×1000/EP(mm)总伸长量△L=∑△Li(mm)切线夹角和θ(rad)孔道每米局部偏差对摩擦的影响系数k说明:两端张拉;θ为从张拉端至计算截面曲线孔道部分的切线夹角之和,AB为有伸缩缝端锚外+锚内到端部的直线段;BC为有伸缩缝端竖弯段部分;CC’为锚内中间直线段部分,C’B’为无伸缩缝端竖弯段部分;B’A’为无伸缩缝锚外+锚内到端部的直线段。梁体一端锚外部分钢束长度包含了限位板厚度6CM,工具锚厚度8CM,千斤顶长度37.5CM,并减去了限位板和工具锚各伸入千斤顶内的3CM和3.5CM;锚外工作长度为45CM。说明:连续段采用一端张拉。平均张拉应力δ=δcon(1-e-(kx+μθ)/(kx+μθ)(MPa)预应力筋的弹性模量Ep(MPa)单端伸长量△L=δ×L×1000/EP(mm)预应力筋与孔道壁的摩擦系数μ张拉控制应力δcon(Mpa)单端锚下部分钢束长度L2(m)单端总长度L=L1+L2钢束编号梁体一端锚外部分钢束长度L1(m)10%张拉20%张拉100%张拉油表读数y=0.021705F*0.1-0.99528(MPa)油表读数y=0.021705F*0.2-0.99528(MPa)油表读数y=0.021705F-0.99528(MPa)N1140798013951367.101.974.9428.68N2140798013951367.101.974.9428.68N3140798013951367.101.974.9428.68N414057001395976.501.123.2420.2010%张拉20%张拉100%张拉油表读数y=0.021705F*0.1-0.99528(MPa)油表读数y=0.021705F*0.2-0.99528(MPa)油表读数y=0.021705F-0.99528(MPa)N11409126013951757.702.826.6337.16N21409126013951757.702.826.6337.16N31409126013951757.702.826.6337.16N4140798013951367.101.974.9428.68预应力砼T梁中跨N1、N2、N3、N4张拉力与油表读数计算表附表1第四页张拉控制应力δ(MPa)控制张拉力F=δ×A/1000(KN)备注YCQ250Q型压力表号为1145钢束编号钢绞线的公称面积Ap(mm2)每束钢绞线数量n(根)每束钢绞线截面面积A=n×Ap(mm2)预应力砼T梁边跨N1、N2、N3、N4张拉力与油表读数计算表钢束编号钢绞线的公称面积Ap(mm2)每束钢绞线数量n(根)每束钢绞线截面面积A=n×Ap(mm2)张拉控制应力δ(MPa)控制张拉力F=δ×A/1000(KN)备注YCQ250Q型压力表号为114510%张拉20%张拉100%张拉油表读数y=0.021731F*0.1+1.144249(MPa)油表读数y=0.021731F*0.2+1.144249(MPa)油表读数y=0.021731F+1.144249(MPa)N1140798013951367.104.127.0930.85N2140798013951367.104.127.0930.85N3140798013951367.104.127.0930.85N414057001395976.503.275.3922.3610%张拉20%张拉100%张拉油表读数y=0.021731F*0.1+1.144249(MPa)油表读数y=0.021731F*0.2+1.144249(MPa)油表读数y=0.021731F+1.144249(MPa)N11409126013951757.704.968.7839.34N21409126013951757.704.968.7839.34N31409126013951757.704.968.7839.34N4140798013951367.104.127.0930.8510%张拉20%张拉100%张拉油表读数y=0.208611F*0.1-0.28824(MPa)油表读数y=0.208611F*0.2-0.28824(MPa)油表读数y=0.208611F-0.28824(MPa)N114057001395195.303.797.8640.45N214057001395195.303.797.8640.45N314057001395195.303.797.8640.45200KN型压力表号为6828预应力砼T梁中跨N1、N2、N3、N4张拉力与油表读数计算表附表1第五页钢束编号钢绞线的公称面积Ap(mm2)每束钢绞线数量n(根)每束钢绞线截面面积A=n×Ap(mm2)张拉控制应力δ(MPa)控制张拉力F=δ×A/1000(KN)备注YCQ250Q型压力表号为1538预应力砼T梁边跨N1、N2、N3、N4张拉力与油表读数计算表钢束编号钢绞线的公称面积Ap(mm2)每束钢绞线数量n(根)每束钢绞线截面面积A=n×Ap(mm2)张拉控制应力δ(MPa)控制张拉力F=δ×A/1000(KN)备注YCQ250Q型压力表号为1538预应力砼T梁连续N1、N2、N3张拉力与油表读数计算表钢束编号钢绞线的公称面积Ap(mm2)每束钢绞线数量n(根)每束钢绞线截面面积A=n×Ap(mm2)张拉控制应力δ(MPa)单根控制张拉力F=δ×A/n/1000(KN)备注10%张
本文标题:预应力筋两端张拉伸长值计算表
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