装配式小箱梁桥荷载横向分布系数探究

A Discussion of Load Transverse Distribution Coefficients of Fabricated Small Box Girder Bridge

以某装配式小箱梁桥为例,采用空间有限元法计算荷载横向分布系数,并与常用的近似计算方法的理论计算数据、实验实测数据进行了对比。结果表明,简支装配式小箱梁桥跨中荷载横向分布系数采用刚接板梁法与空间有限元法及实测挠度、主梁应力得到的横向分布系数较为接近,适用于小箱梁结构设计;先简支后连续装配式小箱梁桥跨中荷载横向分布系数采用等代刚度法与空间有限元法及实测挠度、主梁应力得到的横向分布系数更为接近;杠杆法计算的支点剪力荷载横向分布系数对以上2种结构体系均适用。

Taking some fabricated small box girder for example,load transverse distribution coefficients are calculated by space finite element method and meanwhile,compared with theoretical calculation data by usual approximate calculation method and experimental actual data.The results show that the mid-span load transverse distribution coefficients of simple support fabricated small box girder bridge are similar closely when using rigid joint plate-girder method & space finite element method and actual measurement deflection & main beam stress,being suitable to small box girder structure design;the mid-span load transverse distribution coefficients of first simply supported then continuously supported fabricated small box girder bridge are similar more when using equivalent stiffness method & space finite element method and actual measurement deflection & main beam stress;fulcrum shear load transverse distribution coefficients calculated by lever method are suitable to both structure systems above.