特大型梁式渡槽支座动力计算及结构特性分析  

Dynamic Calculation and Structural Characteristic Analysis on Support of Extra Large Beam Aqueduct

作　　者：付浩雁 王郑 徐乐意 王正新 贾玉豪 FU Haoyan;WANG Zheng;XU Leyi;WANG Zhengxin;JIA Yuhao(Nanjing Water Planning and Designing Institute Co.Ltd.,Nanjing 210001,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Shanghai Investigation Design&Reaearch Institute Co.Ltd.,Shanghai 200335,China)

机构地区：[1]南京市水利规划设计院股份有限公司,江苏南京210001 [2]河海大学水利水电学院,江苏南京210098 [3]上海勘测设计研究院有限公司,上海200335

出　　处：《红水河》2023年第1期1-6,共6页Hongshui River

基　　金：国家重点研发计划项目(2018YFC1508603)。

摘　　要：由于地震是危害特大型梁式渡槽结构安全的原因之一,渡槽支座是槽身的主要承力部位,因此需要计算分析支座的结构动力特性。笔者采用地震动力计算分析理论,结合实际工程建立三维有限元模型,基于三维有限元软件计算分析支座的动力响应特性及其关键节点位移和应力的时程变化规律。工程实例计算分析结果表明:渡槽支座的最大位移为顺槽向位移,出现在边墩上部的支座上;最大压应力与最大拉应力均为整个渡槽结构的应力最大值,其最大拉应力超过了支座混凝土的抗拉强度,会出现拉裂破坏。该文为同类渡槽的支座动力特性研究提供了计算案例。Because the earthquake is one of the reasons that endanger the safety of the extra large beam aqueduct structure, the aqueduct support is the main load-bearing part of the aqueduct body, so it is necessary to calculate and analyze the structural dynamic characteristics of the support. The authors adopt the theory of seismic dynamic calculation and analysis, establish a three-dimensional finite element model in combination with the actual project,and calculate and analyze the dynamic response characteristics of the support and the time-history variation of the displacement and stress of the key nodes based on the three-dimensional finite element software. The calculation and analysis results of an engineering example show that the maximum displacement of the aqueduct support is along the channel, which appears on the support above the side pier;The maximum compressive stress and the maximum tensile stress are the maximum stress of the whole aqueduct structure, and the maximum tensile stress exceeds the tensile strength of the bearing concrete, which will lead to tensile crack failure. This paper provides a calculation case for the study of the dynamic characteristics of the supports of similar aqueducts.

关 键 词：梁式渡槽 动力响应 支座 结构特性 

分 类 号：TV672.3[水利工程—水利水电工程]