近断层地震动特性对重力坝地震响应影响研究  

Study on the influence of near-fault ground motion characteristics on the seismic response of gravity dams

作　　者：陈灯红[1,2] 张心瀚 林天成 岳梦 王睿楠 曾怡阳 CHEN Denghong;ZHANG Xinhan;LIN Tiancheng;YUE Meng;WANG Ruinan;ZENG Yiyang(Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang 443002,China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]防灾减灾湖北省重点实验室(三峡大学),湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《地震工程与工程振动》2025年第2期106-117,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52079072);土木工程防灾减灾湖北省引智创新示范基地项目(2021EJD026)。

摘　　要：基于太平洋地震工程研究中心数据库,依据地震台站的断层距离对所收集的地震记录进行划分,研究不同场地条件下地震动的幅值、频谱和持时特性并进行量化分析;以黄登重力坝为研究对象,从上游坝面顺河向位移、上游坝面主拉应力和下游坝面主压应力3个响应量出发,探究近断层地震的脉冲特性对重力坝地震响应的影响。研究结果表明:脉冲地震下的黄登重力坝坝顶坝趾顺河向相对位移比非脉冲大44%;坝踵处的主拉应力比非脉冲型大30%;坝趾处的主压应力则比非脉冲地震的响应值大31%。相比于非脉冲型地震,脉冲型地震对结构造成的影响不可忽略,结构的各项响应值均明显偏大。因此,在进行抗震设防时需要考虑近断层地震的脉冲作用。Based on the database of the Pacific Earthquake Engineering Research Center,the collected seismic records were classified according to the fault distance of the seismic stations,and the amplitude,spectrum and time characteristics of the ground motions under different site conditions were studied and quantitatively analyzed.Taking the Huangdeng gravity dam as the research object,based on the three response quantities of downstream displacement at the upstream dam face,principal tensile stress at the upstream dam face and principal compressive stress at the downstream dam face,the influence of near-fault earthquake pulse characteristics on seismic response of gravity dams was investigated.The results show that the relative displacement of the toe of the top dam of Huangdeng gravity dam under pulse earthquake is 44%larger than that under non-pulse earthquake.The principal tensile stress at the dam heel is 30%larger than that of the non-pulse type.The principal compressive stress at the toe of the dam is 31%greater than the response value of non-pulsed earthquake.The impact of pulse earthquakes on the structure is not negligible compared with non-pulsed earthquakes,and the response values of the structure were significantly larger.Therefore,it is necessary to consider the impulsive action of near-fault earthquakes in seismic fortification.

关 键 词：近断层 地震动 重力坝 脉冲特性 地震响应 

分 类 号：TV331[水利工程—水工结构工程] P315.9[天文地球—地震学]