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

作　　者：宋力[1] 周志宇[1] 王怀亮[2] 

机构地区：[1]大连大学材料破坏力学数值试验研究中心,辽宁大连116622 [2]大连大学建筑工程学院,辽宁大连116622

出　　处：《水电能源科学》2015年第3期50-53,共4页Water Resources and Power

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)

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.

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 

分 类 号：TV642[水利工程—水利水电工程]