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基于线性二阶和非线性理论对一座多塔斜拉-自锚式悬索组合体系桥梁的活载效应进行对比分析,来确定合理的活载计算分析方法;在活荷载作用下,通过考虑不同的主梁、桥塔及主缆刚度等结构参数,来分析研究结构主要部件的控制截面受力情况。分析结果表明:采用线性二阶和非线性理论对比分析后,主跨160 m的斜拉-自锚式悬索组合体系桥梁的活载效应计算误差在5%以内,在工程中可采用线性二阶理论进行活载作用分析;在活载作用下,副塔及主塔刚度对结构受力性能影响较小,主梁和主缆刚度对结构受力性能影响较大,在同类桥梁设计中应给予足够重视。
Based on the linear second-order and nonlinear theory, the live load effect of a multi-tower cable-stayed bridge with self-anchored suspension system is compared to determine the reasonable live load calculation and analysis method. Under live load, The main girder, bridge tower and the main cable stiffness and other structural parameters to analyze the structure of the main components of the control section of the force situation. The analysis results show that the live load effect of the cable stayed bridge with self-anchored cable-stayed bridge system with main span of 160 m is less than 5%, and the linear second order and nonlinear theory can be used in the project. Order theory to analyze the live load. Under the live load, the stiffness of the secondary tower and the main tower have little effect on the mechanical performance of the structure. The rigidity of the main beam and the main cable has a great influence on the mechanical performance of the structure. Give enough attention.