斜拉桥混合梁结合段长期受力性能研究  

Long-term Behavior of Steel-concrete Joint for Hybrid Girder Cable-stayed Bridge

作　　者：叶恒达 刘荣[2] YE Hengda;LIU Rong(Department of Transportation,China Design Group,Nanjing 210014,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]华设设计集团股份有限公司交通事业部,南京210014 [2]河海大学土木与交通学院,南京210098

出　　处：《武汉理工大学学报（交通科学与工程版）》2022年第5期898-902,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金面上项目(51978245)。

摘　　要：为评估斜拉桥混合梁结合段的长期受力性能,建立钢混结合段实体-板壳有限元模型,运用Fortran语言在用户子程序中开发混凝土和连接件的时变本构.研究混凝土的徐变作用和连接件的刚度时变特性对结合段传力构件的传力比例、连接件作用力、钢梁与混凝土梁的应力传递及预应力损失的影响.结果表明:长期作用10年,时变刚度本构的焊钉传力比例较徐变初期增加12%,焊钉最大剪力增加约50%,焊钉承剪安全性降低.结合段钢与混凝土之间出现应力重分布,钢梁应力增加.预应力徐变损失终值约为6%,结合段混凝土抗裂安全储备削弱.混合梁结合段设计宜考虑混凝土徐变效应.In order to evaluate the long-term mechanical performance of the cable-stayed bridge composite beam joint, the solid-plate-shell finite element model of the steel-concrete joint was established, and the time-varying constitutive equations of concrete and connectors were developed in the user subroutine with Fortran language. The influence of concrete creep and the time-varying stiffness of connectors on the force transfer ratio of force-transmitting members, the force of connectors, the stress transfer between steel beams and concrete beams and the prestress loss were studied. The results show that, after 10 years’ long-term action, the force transmission ratio of the welded stud with time-varying stiffness increases by 12%, the maximum shear force of the welded stud increases by about 0.5 times, and the shear safety of the welded stud decreases. Stress redistribution occurs between the joint steel and concrete, and the stress of the steel beam increases. The final value of prestress creep loss is about 6%, and the safety reserve of concrete crack resistance in the joint section is weakened. Concrete creep effect should be considered in the design of composite beam joint section.

关 键 词：混合梁 结合段 长期性能 徐变 焊钉连接件 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]