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中文摘要：
设计了三维钢桁架桥模型并进行静力试验分析,同时采用Matlab软件编制程序建立三维钢桁架桥静力有限元模型,按照试验静力加载工况对有限元模型进行加载分析。分析不同的单元类型、边界条件、截面尺寸对结果的影响,并与试验结果进行比较。结果表明,在垂直荷载作用下,采用杆单元和梁单元计算的位移结果都比较接近,模型采用铰接的计算结果比固结大,单肢角钢的模型刚度是双肢角钢的模型刚度的50%。理论模型在固结、双肢角钢条件下与试验结果接近。
英文摘要：
The model of steel truss bridge for structural experiment of domestic colleges is 2-dimensional model,which is not inconsistent with the actual steel truss bridge. Therefore,a 3-dimensional steel truss model could be redesigned and analyzed for static test. Meanwhile,the 3-dimensional steel truss static finite element model was established by the Matlab software and analyzed in accordance with the static test loading conditions. The effect of experimental result was analyzed by the different element types,boundary conditions and sectional sizes. The results show that the displacement results computed by truss element are relatively closed to results computed by beam element. The displacement data by hinge condition are larger than data by fixed condition. The stiffness of single model is 50% of the stiffness of coupled model. The experimental data under fixed condition and coupled model are in agreement with the theoretical results.
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