大跨度三主桁连续钢桁梁桥受力特性研究

Study of Mechanical Characteristics of Long-span Main Three-truss Continuous Steel Truss Girder Bridge

为研究横向构件布置与截面设计对3主桁受力均衡性的影响,以宁波市三官堂大桥主桥160 m+465 m+160 m=785 m的大跨径钢桁架连续梁桥为例,采用Midas/Civil软件建立钢桁架梁模型,分析比较对称荷载与偏载作用下主桁结构支反力、轴力和位移等静力效应,得出了3主桁连续钢桁梁桥的内力分布特性。

In order to study the influence of transverse component layout and section design on the force balance of three main trusses,taking the long-span(160 m+465 m+160 m=785 m)steel truss continuous girder bridge of Sanguantang Bridge in Ningbo as an example,the steel truss girder model is established by using the software of MIDAS Civil to analyze and compare the static effects of bearing reaction,axial force and displacement of the main truss structure under the symmetrical loading and unbalance loading.The internal force distribution characteristics of the main tree-truss continuous steel truss girder bridge are obtained.