基于不同设计反应谱的溪洛渡拱坝动力响应分析  

Dynamic response analysis of Xiluodu arch dam based on different design response spectra

作　　者：袁瑞 邱奕翔 时洪涛 王进廷[1] YUAN Rui;QIU Yixiang;SHI Hongtao;WANG Jinting(Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China;China Three Gorges Construction Management Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]清华大学水利水电工程系,北京100084 [2]中国三峡建设管理有限公司,四川成都610000

出　　处：《地震工程与工程振动》2023年第4期45-51,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51725901);中国长江三峡集团有限公司项目(XLD/2117)。

摘　　要：合理的设计反应谱是保证高拱坝动力分析和安全评价结果可靠的前提。为研究不同反应谱时程对拱坝非线性响应的影响,分别基于GB 51247—2018《水工建筑物抗震设计标准》设计反应谱、DL 5073—2000《水工建筑物抗震设计规范》设计反应谱、以及溪洛渡场地相关反应谱,拟合出地震动时程,采用溪洛渡拱坝-库水-地基系统非线性损伤开裂模型进行拱坝的非线性地震响应分析。结果表明:反应谱的选择对溪洛渡拱坝地震响应影响显著,相比于2000年标准反应谱,2018年标准反应谱使溪洛渡拱坝坝顶最大动相对位移增加、坝顶上游面横缝开度增大、孔口和坝踵位置损伤加深。并且,2018年标准下的坝体动力响应整体高于基于场地谱的计算结果,而2000年规范下的坝体动力响应低于场地谱的计算结果,说明2000年规范理应更新,2018年标准更符合当下的抗震设计需求。The safe operation of high arch dams is often threatened by earthquakes.A reasonable design response spectrum is the premise to ensure the reliability of dynamic analysis and safety evaluation results of high arch dams.When the Xiluodu arch dam was designed,the old seismic code for hydraulic structures was still implemented in China.Now,after several revisions and improvements,the current code is the latest standard issued in 2018.In order to study the influence of different response spectrum time histories on the nonlinear response of arch dams,first of all,this paper fits different relevant ground motion time histories,which are based on the design response spectrum of“standard for seismic design of hydraulic structures GB 51247—2018”,the design response spectrum of“specifications for seismic design of hydraulic structures DL 5073—2000”,and the site-related response spectrum of Xiluodu arch dam.Then,this paper adopts the nonlinear plastic damage model of Xiluodu arch dam-reservoir water-foundation system to analyze the nonlinear seismic response.And several ground motion acceleration time histories are used in this paper.The nonlinear seismic response analysis of Xiluodu arch dam is carried out.The results show that the response spectrum has a significant impact on the seismic response of the Xiluodu arch dam.Compared with the standard response spectrum in 2000,the standard response spectrum in 2018 increases the maximum dynamic relative displacement of the dam,increases the opening of the top of the joints on the upstream face of the dam,and deepens damage at the orifice and the dam heel.Moreover,the dynamic response of Xiluodu arch dam under the 2018 standards is generally higher than the calculation results based on the site spectrum,while the dynamic response of the arch dam under the 2000 specifications is lower than the calculation results of the site spectrum.As a result,the 2000 specifications should be eliminated,and the 2018 standards are more suitable for the current seismic design needs.

关 键 词：溪洛渡拱坝 设计反应谱 抗震分析 有限元 

分 类 号：TU32.3[建筑科学—结构工程] TV624.4[水利工程—水利水电工程]