设置加劲索的三塔两跨悬索桥静力性能的渐进方法

Progressive Method on Static Performance of Triple-Tower-Twin-Span Suspension Bridge with Stiffening Cables

设置加劲索的多跨悬索桥属于新型悬索桥结构体系,需要展开深入研究。基于结构力学位移法和渐近法提出了多塔多跨悬索桥静力分析的渐进方法的概念、方法和步骤,最后给出设置加劲索的三塔两跨悬索桥的一个算例,并与有限元方法的结果进行了对比分析。结果表明:渐进方法的计算结果与有限元法有良好的一致性,最大误差为19.68%,满足概念设计小于20%的要求,渐进法适用于三塔两跨悬索桥及多塔多跨悬索桥结构初步设计分析。

The multi span suspension bridge with stiffened cable belongs to a new suspension bridge structure system,which needs to be studied in depth.In this paper,based on the displacement method and progressive method in structural mechanics,a new progressive method including its concept and method as well as steps for the static analysis of multi tower and multi span suspension bridge is put forward,an example is given,the results from the progressive method and those form the finite element method were compared,The results show that there is a favorable consistency between the theoretical calculation results and the finite element method,the maximum error is 19.68% respectively,which meet the requirement of less than 20%of the conceptual design,thus it is a simple method in the preliminary design stage for a multi-span suspension bridge.