钢筋混凝土和预应力混凝土梁式桥

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1、BRIDGEENGRGPARTIIPart2RC&PCbeambridge第二篇钢筋混凝土和预应力混凝土梁式桥Chapter3第三章Analysisofsimplesupportedbeambridge简支梁桥的计算SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJCHEN3.3ComputationofCoefficientsofTransverseDistributionofLoads荷载横向分布计算1.Introduction概述1）Influencelin

2、eandinfluencesurface影响线与影响面2）Conceptaboutthetransversedistributivecoefficient荷载横向分布概念3）Methodforcomputingthetransversedistributivecoefficient荷载横向分布系数计算方法SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJCHENSimplesupportedbeam简支梁onedimension一维杆件Influencelineoft

3、heInternalforce内力影响线S=Pη1(x)η1(x)Poxz3.3ComputationofCoefficientsofTransverseDistributionofLoads荷载横向分布计算1.Introduction概述SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJCHENSuperstructuresystem上部结构系------twodimension二维InfluencesurfaceoftheInternalforce内力影响面η(x

4、,y)P(x,y)oxyzS=Pη(x,y)3.3ComputationofCoefficientsofTransverseDistributionofLoads荷载横向分布计算1.Introduction概述SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJCHEN2）Conceptaboutthetransversedistributivecoefficient荷载横向分布概念若：S=Pη(x,y)≈Pη2(y)η1(x)对比：S=P’η1(x)可以看出系数η2(

5、y)的作用相当于将荷载P沿横向分配给指定的梁，使该梁承受P’的荷载。这样一来，可以将二维问题转化为一维问题处理。3.3ComputationofCoefficientsofTransverseDistributionofLoads荷载横向分布计算1.Introduction概述SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJCHENP1/2P1/2P2/2P2/2P1/2P1/2P2/2P2/2mP1mP2DiagramoftheCoefficientsofTran

6、sverseDistributionofLoads横向分布系数图示3.3MethodforcomputingCoefficientsofTransverseDistributionofLoads荷载横向分布系数计算Twospecialcases荷载横向分布集系数的两种特殊情形P33Pm3=1m3=1/5Rigidtransverseconnection横梁刚度无限大Notransverseconnection横向无联系SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJ

7、CHEN1.Introduction概述3）荷载横向分布系数计算方法杠杆原理法Methodbasedonmechanicsofleverage偏心压力法Methodbasedonstiffnesstransverseconnection横向铰接梁（板）法横向刚接梁法比拟正交异性板法SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJCHEN3.3MethodforcomputingCoefficientsofTransverseDistributionofLoads荷载

8、横向分布系数计算2.Methodbasedonmechanicsofleverage杠杆原理法1）Assumption原理假设Thismethodisbasedontheweakconnectionbetweengirders忽略主梁之间的横向联系作用，即假设桥面板在主梁上断开。3.3Methodforcomputingthetransversedistributivecoefficient荷载横向分布系数计算SCHOOLOFTRANSPORTATION,WUTPRODUCEDBY：XJCHEN