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ID:33500053
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页数:9页
时间:2019-02-26
《箱梁张拉伸长量计算》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、20m箱梁伸长量计算中跨σcon=1860×0.75=1395(MPa)N=σcon×Ay=1395×140==195.3(KN)CD:537BC:2879.8AB:6348μ=0.25k=0.0015线段L(m)θ(rad)kx+终点力AB6.384200.0.99047193.439BC2.87980.0.0.97208188.038CD0.53700.0.187.887Ay-预应力筋的截面面积(mm2)Eg-预应力筋的弹性模量(Eg取值为1.95×105N/mm2)L-从张拉端至计算截面的预应力筋长度θ-从张拉端至计算截面
2、曲线孔道部分切线的夹角之和(rad)κ-孔道每米局部偏差对摩擦的影响系数(κ取值为0.0015)μ-预应力筋与孔道壁的摩擦系数(μ取值为0.25)AB:ΔL1=45.BC:ΔL2=19.CD:ΔL3=3.(45.+19.+3.)×2=136.(mm)CD:2015BC:2879.8AB:4923.4μ=0.25k=0.0015线段L(m)θ(rad)kx+终点力AB4.923200.0.99264193.863BC2.87980.0.0.97208188.450CD2.01500.0.99698187.881AB:ΔL1=34.
3、BC:ΔL2=19.CD:ΔL3=13.(34.+19.+13.)×2=136.(mm)CD:7901BC:733AB:1065μ=0.25k=0.0015线段L(m)θ(rad)kx+终点力AB1.066500.0.194.988BC0.7330.0.0.193.588CD7.90100.0.191.307AB:ΔL1=7.BC:ΔL2=5.CD:ΔL3=55.=(7.+5.+55.)×2=135.(mm)σcon=1860×0.75=1395(MPa)N=σcon×Ay=1395×140==195.3(KN)N1(4根):1
4、95.3×4=781.2(KN)N2(4根):195.3×4=781.2(KN)N3(3根):195.3×3=585.9(KN)4束:15%:117.18,30%:234.36,50%:390.63束:15%:87.885,30%:175.77,50%:292.95边跨σcon=1860×0.75=1395(MPa)N=σcon×Ay=1395×140==195.3(KN)CD:537BC:2879.8AB:6348μ=0.25k=0.0015线段L(m)θ(rad)kx+终点力AB4.805700.0.193.897BC2.8
5、7980.0.0.97208188.483CD2.12800.0.187.882Ay-预应力筋的截面面积(mm2)Eg-预应力筋的弹性模量(Eg取值为1.95×105N/mm2)L-从张拉端至计算截面的预应力筋长度θ-从张拉端至计算截面曲线孔道部分切线的夹角之和(rad)κ-孔道每米局部偏差对摩擦的影响系数(κ取值为0.0015)μ-预应力筋与孔道壁的摩擦系数(μ取值为0.25)AB:ΔL1=34.BC:ΔL2=19.CD:ΔL3=14.(34.+19.+14.)×2=136.(mm)CD:2015BC:2879.8AB:492
6、3.4μ=0.25k=0.0015线段L(m)θ(rad)kx+终点力AB3.357200.0.99498194.320BC2.87980.0.0.97208188.895CD3.58200.0.99464187.883AB:ΔL1=23.BC:ΔL2=19.CD:ΔL3=24.(23.+19.+24.)×2=136.(mm)CD:7901BC:733AB:1065μ=0.25k=0.0015线段L(m)θ(rad)kx+终点力AB1.016500.0.195.000BC0.7330.0.0.193.600CD8.00100.0
7、.191.290AB:ΔL1=7.BC:ΔL2=5.CD:ΔL3=55.=(7.+5.+55.)×2=136.(mm)σcon=1860×0.75=1395(MPa)N=σcon×Ay=1395×140==195.3(KN)N1(5根):195.3×5=976.5(KN)N2(4根):195.3×4=781.2(KN)N3(4根):195.3×4=781.2(KN)5束:15%:146.48,30%:292.95,50%:488.254束:15%:117.18,30%:234.36,50%:390.6压力表:,千斤顶:4束:15
8、%30%50%100%103%P(KN)117.18234.36390.6781.2F(Mpa)3.87.713.0026.226.93束:15%30%50%100%103%P(KN)87.885175.77292.95585.9F(Mpa)2.805.769.
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