波形钢腹板部分斜拉桥施工阶段剪力滞效应分析  

Analysis of shear lag effect of extradosed cable-stayed bridges with corrugated steel webs during construction

作　　者：袁帅华[1] 段文强 周聪 陈宁[1] YUAN Shuaihua;DUAN Wenqiang;ZHOU Cong;CHEN Ning(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《中南大学学报（自然科学版）》2021年第11期4055-4062,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51608193);湖南省教育厅一般项目(16C0645)。

摘　　要：以某悬臂施工的波形钢腹板部分斜拉桥为研究背景,分别建立空间杆系和实体有限元模型,对施工过程进行精确模拟。选取3个控制断面,对单箱多室组合箱梁在不同施工阶段的剪力滞效应进行分析,得出控制断面在施工过程中的剪力滞效应变化规律。研究结果表明:随着施工阶段由短悬臂状态向最大悬臂状态不断推进,控制截面顶板、底板剪力滞系数逐渐增大,在最大悬臂状态达到峰值,全桥合龙及二期恒载作用后,剪力滞系数开始减小且下降幅度较大;3个控制截面中,靠近零号块的截面剪力滞效应变化趋势更显著;实测值与有限元计算值基本吻合,验证了模型分析的准确性。Taking a cantilevered extradosed cable-stayed bridge with corrugated steel webs as the research background, a spatial frame finite element model and its corresponding spatial solid finite element model were established to accurately simulate the construction process. Three control sections were selected, and the shear lag effect of multi-cell composite box girder at different construction stages was analyzed, and the change rule of the shear lag effect of the control sections during construction was obtained. The results indicate that as the construction phase advances from the short cantilever state to the maximum cantilever state, the shear lag coefficients increase gradually at the top and bottom flanges of control sections, while the peak of the coefficients appears at the maximum cantilever state. With all dead loads enforced, the shear lag coefficients begin to decrease obviously. This change is more obvious in the section near the bent cap;the numerical models are validated with practical values.

关 键 词：波形钢腹板 部分斜拉桥 单箱多室 剪力滞效应 悬臂施工 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]