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悬索桥结构分析的首要问题是如何确定成桥状态时缆、索、梁的空间位置(即成桥状态初始构形)和缆、索构件的内力(即单元初应变)。基于通用有限元程序,本文先用悬链线公式给出主缆的近似位置,然后通过对结构进行拆分、组合的分析过程,详细地给出了悬索桥成桥状态初始构形和缆、索内力的确定方法。对于单跨悬索桥的边跨,根据其主缆水平分力与中跨相等的原则,用悬链线公式即可给出主缆线形。最后,本文对润扬悬索桥的成桥状态进行了计算确定,并与竣工实测数据进行了对比。对比分析表明,计算结果与实测结果较为一致,本文方法具有很好的工程应用价值,可为同类大跨悬索桥的计算分析提供有益的参考。
The primary problem in structural analysis of suspension bridges is how to determine the spatial position of cable, cable and beam (initial configuration of bridge-forming state) and the internal forces of cables and cables (ie, the initial strain of the unit). Based on the general finite element program, this paper gives the approximate position of the main cable by using the catenary formula. Then, through the analysis of the structure and the combination process, the initial configuration of the bridge and the cable and cable Internal force to determine the method. For the single-span suspension bridge side span, according to its main cable horizontal component and the principle of equal span, with the catenary formula can be given the main cable shape. Finally, this paper calculates and confirms the bridge status of Runyang Suspension Bridge, and compares it with the actual measured data. The comparative analysis shows that the calculated results are in good agreement with the measured ones. The proposed method has good engineering application value and can provide useful reference for the calculation and analysis of similar long-span suspension bridges.