连续钢-混组合梁桥收缩徐变效应分析

Analysis on Shrinkage and Creep Effects of Continuous Steel-Concrete Composite Beam Bridge

摘要:

钢-混组合梁桥因其良好的力学性能，在工程中运用越来越广泛。以某城市45 m+70 m+45 m大跨径连续钢-混组合梁桥为研究对象，利用MIDAS Civil计算软件，针对混凝土收缩徐变效应影响进行分析。根据计算分析结果，混凝土收缩徐变作用下引起结构应力重分布，对钢梁主要产生压应力，对桥面板主要产生拉应力。因收缩徐变影响，钢梁不同部位所处的最不利阶段不同。支点位移法顶升高度越大，混凝土收缩徐变影响越大，支点位移法在混凝土收缩徐变影响下结构受力状态趋向于无顶升成桥阶段。

Abstract:

Steel-concrete composite beam bridge is increasingly widely used in engineering because of its good mechanical properties. Taking a 45 m+70 m+45 m long-span continuous steel-concrete composite beam bridge in a city as the research object, MIDAS Civil calculation software is used to analyze the influence of concrete shrinkage and creep effects. According to the calculation and analysis results, the structural stress redistribution caused by concrete shrinkage and creep mainly generates the compressive stress on steel beams and the tensile stress on bridge decks. Due to the effects of shrinkage and creep, the most unfavorable stages for different parts of the steel beam are different. The greater the lifting height of the pivot displacement method, the greater the impact of concrete shrinkage and creep. Under the influence of concrete shrinkage and creep, the structural stress state of the pivot displacement method tends towards the stage of bridge completion without lifting.