Considering the non-linear features of the structure, the study adopts the large-scale finite element analyzing program ANSYS, to establish the two or three-dimensional finite element benchmark models of the single main beam and the three main beams, analyzes the component parameter, such as the section form of the main beam and the diaphragm, which influence the open section main beam, researches the influence law of its changes on the dynamic features of the stayed-cable bridges with open section main beam, and achieves some valuable conclusions.%考虑结构的非线性,采用大型有限元分析程序ANSYS建立单主梁和三主梁两种三维有限元基准模型,对开口截面主梁具有影响的一些构造参数（主梁截面形式、横隔梁）进行了分析,并研究了其变化对开口截面主梁斜拉桥动力特性的影响规律,得出一些有价值的结论。
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