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利用势能极小值原理推导简化的三主桁三索面结构在对称荷载作用下的索力表达式,将其计算结果与有限元计算结果进行对比,阐述其横向受力原理,总结三主桁三索面斜拉桥在对称荷载作用下索力的横向分配规律。分析结果表明,三主桁三索面斜拉桥边索、中索索力不是简单的3倍或者2倍左右的关系,其差异随拉索刚度、主梁横向联接体系刚度、节点刚度等因素变化。
The principle of potential energy minimum is used to deduce the cable force expression of simplified three-girder three-cable structure under symmetrical load. The calculation results are compared with the finite element results. The principle of transverse force is expounded. The three main girders Horizontal distribution of cable force under symmetrical load on three cable - stayed cable - stayed bridge. The analysis results show that the triaxial cable and midsoxoling force of the three main girder three cable-stayed cable-stayed bridge is not a simple three times or two times the relationship, the difference with the cable stiffness, transverse stiffness of the main beam system, node stiffness and other factors .