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大庆西站平面桁架结构跨越两层楼面,结构高度大,承载大,杆件与杆件之间采用刚性连接交织成网状,缺乏有效面外支撑,结构受力非常复杂,存在失稳破坏的风险。为研究大庆西站跨层重载平面桁架的整体稳定性,基于子结构分析法和大位移控制算法对跨层平面桁架结构的非线性稳定承载力进行分析,明确该平面桁架结构的失稳模式和稳定承载力,对结构的整体安全性进行评价。研究表明:跨层桁架的失稳模式表现为半波形面外鼓曲,桁架失稳后表现出“屈曲后不稳定”特性;非线性稳定分析得到的整体稳定系数均大于2,满足规范稳定承载力的要求。
Daqing West Railway Station plane truss structure spanning two floors, the structure of large height, bearing large, rigid connection between the rod and the rod intertwined into a mesh, the lack of effective surface support, the structure of the force is very complex, there is instability damage risks of. In order to study the overall stability of the cross-deck heavy-load plane truss in Daqing West Railway Station, the nonlinear stability and bearing capacity of the cross-deck truss structure is analyzed based on the substructure analysis method and the large displacement control algorithm, and the instability mode of the plane truss structure And stable bearing capacity, the overall safety of the structure is evaluated. The results show that the instability mode of the cross-layer truss is half-wave out-plane buckling, and the buckling instability of the truss shows “unstable after buckling”. The overall stability coefficients obtained by nonlinear stability analysis are all greater than 2, Stable carrying capacity requirements.