基于精细化分析的不对称刚构桥研究

Research on Unsymmetrical Rigid Frame Bridge Based on Fine Analysis

为研究不对称刚构桥在外荷载作用下内力及变形的规律,基于精细化分析的思路,利用midas/FEA建立空间实体模型分析,实现对温度、支座沉降、收缩徐变的计算。文中依托广东省省道S223线松源至雁洋段改建工程黄社大桥(60+95+150+90)m四跨不对称连续刚构桥为工程背景,对比分析了实体模型与杆系模型在温度、支座沉降、收缩徐变下顶底板主拉应力的差异。结果分析表明:在各工况的作用下,主墩墩顶主拉应力较为集中,主墩侧边跨应力较次边跨及远离主跨的边跨侧大,其中降温及徐变作用对顶底板主拉应力影响较大,实体模型中应力及变形结果均比杆系模型有不同程度的增加。

In order to study the law of internal force and deformation of unsymmetrical rigid frame bridge under external load, based on the idea of fine analysis, the spatial solid model analysis is established by using midas/FEA, and the calculation of temperature, support settlement and shrinkage and creep is realized. Based on the project background of Huangshe Bridge (60+95+150+90) m four-span continuous rigid frame bridge of S223 provincial road in Guangdong Province, the differences of principal tensile stress between solid model and bar model under temperature, support settlement, shrinkage and creep are compared and analyzed in this paper. The results show that under the action of various working conditions, the principal tensile stress of the top of the main pier is concentrated, and the side span stress of the main pier is larger than that of the secondary side span and the side span far away from the main span, and the effect of cooling and creep on the principal tensile stress of the roof and floor is larger than that of the secondary side span and the side span away from the main span. The results of stress and deformation in the solid model are higher than that of the bar model to some extent.