榕江特大桥连续钢桁梁悬拼施工稳定性探讨

Discussion on Construction Stability of Continuous Suspending of Steel Truss Girder of Rongjiang Grand Bridge

全长7 373.921m的榕江特大桥集高、大、难、新、深、急、险、重等八大特点于一身,工艺复杂,技术标准高,施工难度大。以第八阶段计算为例,介绍了用有限元仿真软件MSC-PATRAN-NASTRAN对施工阶段的计算过程;在此基础上对中间跨和边跨最大悬臂状态时倾覆稳定性进行了理论计算,证明了榕江特大桥连续钢桁梁悬拼施工的稳定性,指导了该桥的施工。

Rongjiang super-large bridge has a span of 7, 373.921 m high, with features of big, difficult, new, deep, and acute and risks, such as the eight features at a suit, process complex, high technical standard, construction is difficult. Taking eighth phase calculation for an example, this article introduced calculation process of construction stage by using the finite el-ement simulation software MSC-PATRAN-NASTRAN; on the basis of the middle span and side span the maximum cantilever state stability has carried on the theoretical calculation, proved the Rongjiang super-large bridge stability of the continuous steel truss beam and cantilever construction, which guided the construction of the bridge.