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本文以组合体系拱桥为典型结构,用结构矩阵分析的直接刚度法进行了分析,并编制了相应的电算程序。文中介绍了三种类型立柱的单元刚度矩阵,用子结构法计算变截面杆的方法,以及等效节点荷载的算法。还用“代替杆”模拟中间铰支座,进行了对比分析。使用本方法及电算程序进行组合体系拱桥计算将可以代替过去所谓的拱和拱上结构共间作用的繁琐分析和大量计算工作,从而大大加快设计计算速度。
In this paper, a composite arch bridge is taken as a typical structure, which is analyzed by the direct stiffness method of structural matrix analysis, and a corresponding computer program is compiled. In this paper, the unit stiffness matrixes of three types of columns, the method of calculating the cross-section bar by the substructure method and the algorithm of the equivalent node load are introduced. We also use “instead of the rod” to simulate the middle hinged support, a comparative analysis. Using this method and computer program to calculate the arch bridge will be able to replace the tedious analysis and massive calculation work of the so-called common function between arch and arch structure in the past, so as to greatly accelerate the design calculation speed.