2022年四川泸定 M_(s)6.8地震强震动特性研究  

Strong motion characteristics of the 2022 Luding M_(s)6.8 earthquake,Sichuan province

作　　者：张聪 周宝峰[1,2] 任叶飞[1,2] 王晓敏 余桦[3] 张亚军 吴华灯[5] ZHANG Cong;ZHOU Baofeng;REN Yefei;WANG Xiaomin;YU Hua;ZHANG Yajun;WU Huadeng(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China;Sichuan Earthquake Agency,Sichuan,Chengdu 610200,China;Ningxia Communications Construction Co.,LTD,Yinchuan 750004,China;Guangdong Earthquake Agency,Guangdong Guangzhou 510070,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]中国地震局工程力学研究所地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080 [3]四川省地震局,四川成都610200 [4]宁夏交通建设股份有限公司,宁夏银川750004 [5]广东省地震局,广东广州510070

出　　处：《世界地震工程》2024年第1期13-24,共12页World Earthquake Engineering

基　　金：中央级公益性研究所所长基金(2022C05);黑龙江省自然科学联合引导基金(LH2022E120);地震科技星火计划项目(XH21023);宁夏回族自治区重点研发项目(2022BEG03062)。

摘　　要：北京时间2022年9月5日12时52分,四川省甘孜州泸定县发生M_(s)6.8级地震。国家强震动台网获得了133组三分量加速度记录,在对记录进行初步筛选和滤波后,研究了PGA和PGV衰减关系、竖向地震动特点、地震动速度脉冲,对比分析了反应谱和设计谱,着重对石棉挖角台站附近震害与地震动的相关性进行了分析,结论如下:1)三种台站强震动记录的PGA和PGV拟合曲线都比较相近,PGA、PGV拟合曲线与霍俊荣的预测模型较为接近;2)竖向地震动偏大,约38.2%的强震动记录V/H大于2/3,可能是屋顶塌落、柱子扭转和天花板坠落等震害现象出现的主要原因;3)识别出具有速度脉冲特性的记录11条,该类记录对长周期结构影响较大;4)所选记录反应谱大多超过了罕遇地震设计谱水平段,具有速度脉冲特性的051SMW台站周围房屋破坏较严重,人员伤亡较重。At 12:52 Beijing time on September 5,2022,an M_(s)6.8 magnitude earthquake struck Luding County,Garze Prefecture,Sichuan Province.133 sets of three-component acceleration records were obtained by the National strong motion network.After preliminary screening and filtering of the records,the attenuation relationship between PGA and PGV,vertical ground motion characteristics and ground motion velocity pulses were studied,and the response spectrum and design spectrum were compared and analyzed,focusing on the correlation between earthquake damage and ground motion near the 051SMW station.The conclusions are as follows:1)PGA and PGV fitting curves of the strong motion records are similar for three kinds of stations,and the fitting curves of PGA and PGV are close to Huo Junrong’s prediction model;2)The vertical ground motion is considerably significant,with approximately 38.2%of the strong motion records displaying a V/H ratio greater than 2/3.This factor could potentially contribute to the occurrence of seismic damage phenomena,including roof collapse,column torsion,and ceiling fall;3)11 records with velocity pulse characteristics were identified,which had a great influence on the long-period structure;4)Most of the selected recorded response spectra exceeded the horizontal section of the design spectrum of rare earthquakes,and the houses around the 051SMW station with velocity pulse characteristics were seriously damaged and the casualties were heavy.

关 键 词：泸定M_(s)6.8地震 地震动衰减 竖向地震动 速度脉冲 加速度反应谱 

分 类 号：TU315.7[建筑科学—结构工程]