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桁架钢结构具有优良的力学性能,被广泛应用于重载高耸的工程机械和建筑结构中,其稳定性校核的重要性尤显突出。超静定桁架结构的稳定性分析复杂,需要借助于有限元软件求解,但有时会得到错误的结果。本文从精确有限元理论出发,推导了桁架结构的临界稳定表达式,由表达式阐释了产生错误的原因,编写了基于ANSYS软件二次开发程序,改进了应用有限元软件分析超静定结构稳定性的方法,来获取桁架结构真实的临界失稳载荷。
Truss steel structure has excellent mechanical properties, is widely used in overloaded towering construction machinery and building structures, the importance of its stability check is particularly prominent. The stability analysis of statically indeterminate truss structures is complicated and needs to be solved by means of finite element software, but sometimes wrong results can be obtained. Based on the accurate finite element theory, the critical stable expression of truss structure is deduced. The reason of the error is explained by the expression. The program of secondary development based on ANSYS is programmed and the stability of statically indeterminate structure The way to obtain the true critical buckling load of truss structure.