弹性模量取值对渡槽结构抗震安全复核影响的探讨  

Discussion on the Influence of Dynamic Elastic Modulus Value on Structural Safety of Aqueducts under Earthquake

作　　者：吕小彬[1,2,3] 李秀琳 肖俊[1,2,3] LU Xiaobin;LI Xiulin;XIAO Jun(Department of Materials,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Key Laboratory of Engineering Materials of Ministry of Water Resources,Beijing 100038,China;Beijing IWHR-KHL Co.,Ltd.,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院材料研究所,北京100038 [2]水利部水工程材料重点实验室(筹),北京100038 [3]北京中水科海利工程技术有限公司,北京100038

出　　处：《水力发电》2023年第9期57-61,共5页Water Power

基　　金：广西重点研发计划项目(2019AB20003);湖南省水利科技项目(XSKJ2019081-17)。

摘　　要：通过对某渡槽进行现场动力测试获得结构在自然脉动下的振动特性,结合三维有限元模态反分析,获得其排架混凝土的动弹性模量状况,根据现场质量检测的结果,对排架混凝土动弹性模量的取值及基础约束条件做出最合理的判断。抗震分析表明,排架混凝土动弹性模量的取值会对该渡槽结构的抗倾覆稳定造成比较大的影响。因此,建议在渡槽抗震复核中应着重考虑混凝土的动弹性模量,利用振型分解反应谱法分析时能够对地震作用效应进行更充分的估算,提高结构抗震安全评估的可靠性。The vibration characteristics of an aqueduct under natural pulsations are obtained through field dynamic testing,and the dynamic elastic modulus E d of bent frame concrete of the aqueduct is obtained through three-dimensional finite element modal inverse analysis.In accordance with the in-situ non-destructive concrete quality inspection results,the most reasonable estimation of E d of bent frame concrete and the constraint conditions of foundation are obtained.The seismic analysis shows that different E d value assignment has a significant impact on the overturning stability of aqueduct.Therefore,it is recommended that proper dynamic instead of static elastic modulus should be adopted in the seismic safety review of aqueducts to ensure an accurate calculation of earthquake force when using modal superposition method,thus to achieve a reliable safety assessment of those structures.

关 键 词：渡槽 抗震分析 动弹性模量 模态分析 抗震安全复核 

分 类 号：TV672.3[水利工程—水利水电工程]