水渠中桥20m预应力砼箱梁预应力钢绞线张拉理论伸长量复核.doc

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1、Word文档...范文范例...内容齐全南水渠中桥20m预应力砼箱梁预应力钢绞线张拉理论伸长量复核一、张拉力的计算（依据图纸资料）控制应力δk=1395.0Mpa,初张拉应力0.1δk=139.5Mpa,单根270级（1860Mpa）Φs15.24mm钢绞线面积A=140mm2,张拉力：Nk=N·A·δk1、正弯矩区：中跨N1与边跨N1、N2、N3、N4张拉钢绞线为一束4根组成；中跨N2、N3张拉钢绞线均为一束3根组成。2、中跨N1与边跨N1、N2、N3张拉力：控制张拉应力δk=N·A·δk=4·140·1395=781200N=781.2KN初张拉应力0.1δk=0.1·78

2、1.2=78.12KN中跨N2、N3张拉力：控制张拉应力δk=N·A·δk=3·140·1395=585900N=585.9KN初张拉应力0.1δk=0.1·585.9=58.59KN2、负弯矩区：T1张拉钢绞线为一束5根组成；T2、T3张拉钢绞线为一束4根组成。T1张拉力：控制张拉应力δk=N·A·δk=5·140·1395=976500N=976.5KN初张拉应力0.1δk=0.1·976.5=97.65KNT2、T3张拉力：控制张拉应力δk=N·A·δk=4·140·1395=781200N=781.2KN初张拉应力0.1δk=0.1·781.2=78.12KN专业资料.

3、..供学习...参考...下载Word文档...范文范例...内容齐全设计张拉力汇总部位边跨中跨正弯矩张拉力（N）N1N2N3N1N2N3781200585900585900781200781200781200负弯矩张拉力（N）T1T2T3976500781200781200二、伸长量计算1、平均张拉力计算依据规公式Pp=(P×（1-e-（kx+μθ））)/（kx+μθ）查《规范》附表G-8得K=0.0015，μ=0.25A、边跨：N1#:取x=9.814mθ=5。30’=0.095993radp=781200Pp=（781200×（1-e-（0.0015×9.814+0.25

4、×0.95993）））/（0.0015×9.814+0.25×0.095993）=766277NN2#:取x=9.819mθ=5。30’=0.095993radp=781200Pp=（781200×（1-e-（0.0015×9.819+0.25×0.095993）））/（0.0015×9.819+0.25×0.095993）=766267NN3#:取x=9.751mθ=1。24’=0.024439radp=781200Pp=（781200×（1-e-（0.0015×9.751+0.25×0.024439）））/（0.0015×9.751+0.25×0.095993）=77315

5、6NB、中跨：N1#:取x=9.801mθ=5。30’=0.095993radp=781200专业资料...供学习...参考...下载Word文档...范文范例...内容齐全Pp=（781200×（1-e-（0.0015×9.801+0.25×0.09553）））/（0.0015×9.801+0.25×0.095993）=766277NN2#:取x=9.818mθ=5。30’=0.024435radp=585900Pp=（585900×（1-e-（0.0015×9.818+0.25×0.024435）））/（0.0015×9.818+0.25×0.024435）=579838N

6、N3#:取x=9.701mθ=1。24’=0.087267radp=585900Pp=（585900×（1-e-（0.0015×9.701+0.25×0.087267）））/（0.0015×9.701+0.25×0.087267）=579889NC负弯矩：T1#:取x=3.0mθ=0。=0radp=976500Pp=（976500×（1-e-（0.0015×3.0+0.25×0）））/（0.0015×3.0+0.25×0）=974306NT2#:取x=3.0mθ=0。=0radp=781200Pp=（781200×（1-e-（0.0015×6.65+0.25×0）））/（0.0

7、015×3.0+0.25×0）=779445NT2#:取x=6.50mθ=0。=0radp=781200Pp=（781200×（1-e-（0.0015×6.50+0.25×0）））/（0.0015×6.50+0.25×0）=777404N钢绞线束号X(m)θ(rad)kx+μθe-（kx+μθ）P(N)Pp(N)边跨N19.8140.0959930.03870.96204781200766572N29.8190.0959930.02080.97941781200766267N39.7510.