考虑混凝土收缩和徐变的钢混组合梁挠度分析  

Deflection analysis of steel-concrete composite beam considering concrete shrinkage and creep

作　　者：郑修军 刁琥 张理民 孙富学[3] Zheng Xiujun;Diao Hu;Zhang Limin;Sun Fuxue(Ningbo Construction Engineering Safety and Quality Management Service Station,Ningbo Zhejiang 315048,China;Shanghai Urban Construction Municipal Engineering(Group)Co.,Ltd.,Shanghai 200065,China;Wenzhou University College of Civil Engineering and Architecture,Wenzhou Zhejiang 325035,China)

机构地区：[1]宁波市建设工程安全质量管理服务总站,浙江宁波315048 [2]上海城建市政工程(集团)有限公司,上海200065 [3]温州大学建筑工程学院,浙江温州325035

出　　处：《山西建筑》2025年第3期119-124,共6页Shanxi Architecture

基　　金：浙江省基础公益研究计划(项目编号:LGF19E080013)。

摘　　要：钢混组合梁需要设置预拱度以抵消荷载、混凝土收缩和徐变等因素导致的挠度。采用板壳单元和实体单元描述钢箱梁和钢筋混凝土桥面,建立大跨度钢混组合简支梁的有限元模型,并采用等效降温法和有效模量法分别描述混凝土收缩和徐变的影响,分析了长期挠度变化规律,并与实测值进行对比验证。结果表明,考虑混凝土收缩和徐变后的长期挠度仅为经验预拱度的58%,不利于成桥线型控制。Pre-camber should be set for the steel-concrete composite beam to offset the deflection caused by loads,con-crete shrinkage and creep and other factors.In this paper,plate and shell elements and solid elements are used to describe the steel box girder and reinforced concrete bridge deck.The finite element model of long-span steel-concrete composite simply-supported beam is established,and the equivalent cooling method and the effective modulus method are used to de-scribe the effect of concrete shrinkage and creep.The long-term variation of the steel-concrete composite beam deflection is analyzed.Besides,the rationality of the calculation is verified by comparison with the measured value.Results show that the long-term deflection with shrinkage and creep of concrete is only 58%of the empirical pre-camber,which is not conducive to the linear control of the completed bridge.

关 键 词：钢混组合梁 预拱度 挠度 有限元 收缩和徐变 

分 类 号：TU312.1[建筑科学—结构工程]