大跨径钢-UHPC轻型组合梁斜拉桥力学与经济性能研究

摘要

为解决传统大跨径斜拉桥中钢主梁存在的桥面铺装易损,钢面板疲劳破坏等问题,提出了两种轻型组合梁方案.建立了主跨1 100m的传统钢主梁斜拉桥和两种轻型组合梁斜拉桥的有限元计算模型,对三种方案的静力性能、动力特性和经济性能进行了分析比较.结果表明:在力学性能方面,两种轻型组合梁在大跨径斜拉桥中的应用是可行的;三种方案的初始建设造价相近,从全寿命角度来看,两种轻型组合梁斜拉桥的经济性能明显优于传统钢主梁斜拉桥.%For long-span cable-stayed bridge,the main type girder is steel beam,with damage in paving as well as fatigue cracks occur frequently in the orthotropic steel deck.In order to solve these problems,two kinds of lightweight steel-UHPC composite beams are proposed.The finite element models of traditional steel girder cable-stayed bridge with 1 100 m main span and two lightweight composite beam cable-stayed bridges with the same span are established to analyze and compare the static performance、dynamic characteristics and economic performance.The results show that:for mechanical properties,the application of two lightweight beams in large span cable-stayed bridge is feasible;and the construction cost of three bridges is similar;from the view of life-cycle,the two kinds of lightweight composite beam cable-stayed bridges are more economic than the traditional steel girder cable-stayed bridge.