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考虑库水可压缩性的重力坝地震响应分析

Dynamic Behavior Analysis of Gravity Dam Considering Water Compressibility
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摘要 以丰满重力坝重建工程为例,采用ANSYS-FSI流固耦合方法,考虑库水可压缩性对重力坝动力特性的影响,建立了丰满重力坝代表性坝段的坝体—库水—地基模型,分析了丰满重力坝的自振特性及其在地震作用下的动力时程响应。结果表明,考虑库水可压缩性能显著影响重力坝坝体的自振频率,与空库时相比坝体基频降低约16%,且随自振阶数增加,自振频率相对降低越多;与附加质量模型相比,该模型在设计地震荷载作用下能得到更加合理的坝体位移和应力,为丰满重力坝的抗震性能安全评价提供了有限元分析参考。 Taking reconstruction project of Fengman gravity dam for an example,ANSYS-FSI fluid solid coupling method is used to establish dam-water-foundation model of representative section of Fengman gravity dam by considering the influence of reservoir water compressibility on dynamic behavior of gravity dam.And then the natural vibration characteristics and dynamic time history response are analyzed under action of earthquake.The calculation results show that considering the reservoir water compressibility,the fluid solid coupling model of gravity dam can significantly decrease the natural frequencies of dam;the fundamental frequency is reduced about 16%;with the order of natural frequencies increasing,the relative natural frequencies decrease more.Compared with the additional mass model,the proposed model can obtain more reasonable dam displacements and stresses under the action of designed earthquake loading,which provides finite element analysis reference for the seismic safety evaluation of Fengman gravity dam.
作者 宋力 周志宇 王怀亮 SONG Li;ZHOU Zhi-yu;WANG Huai-liang;(1.Research Center for Numerical Tests on Material Failure,Dalian University;2.Civil Engineering Technology Research and Development Center,Dalian University; Dalian 116622, China)
出处 《水电能源科学》 北大核心 2015年第3期50-53,共4页 International Journal Hydroelectric Energy
基金 河海大学水文水资源与水利工程科学国家重点实验室开放研究基金项目(2013491811)
关键词 库水可压缩性 流固耦合 丰满重力坝 地震响应 时程分析 reservoir water compressibility fluid solid coupling Fengman gravity dam earthquake response time history analysis
作者简介 宋力(1959-),男,教授,研究方向为岩石与混凝土材料弹塑性损伤,E-mail:songli-500@163.com
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