近断层地震动等效速度脉冲研究

英文篇名：STUDY ON EQUIVALENT VELOCITY PULSE OF NEAR-FAULT GROUND MOTIONS
中文刊名：地震学报
英文刊名：Acta Seismologica Sinica
作者：李新乐 ; 朱晞
英文作者：Li Xinle Zhu Xi(College of Civil Engineering and Architecture ; Beijing Jiaotong University ; Beijing 100044 ; China)
中文关键词：近断层地震动 ; 等效速度脉冲 ; 脉冲周期 ; 脉冲强度
英文关键词：near-fault ground motions ; equivalent velocity pulse ; pulse period ; pulse intensity
出版日期：2004-12-15
机构：北京交通大学土木建筑工程学院 ,北京交通大学土木建筑工程学院中国北京100044,中国北京100044
年：2004
期：06
出版单位：地震学报

摘要

近断层地震动对地表结构物造成严重的破坏 ,它具有明显的方向性和脉冲型特征 .在速度时程中含有大幅值、长周期的脉冲波 ,对结构响应影响很大 .为简化计算和分析的需要 ,在既有的等效速度脉冲模型的基础上 ,建议了较为合理等效速度脉冲模型 .在充分收集脉冲型近断层地震记录的基础上 ,对等效速度脉冲模型的脉冲周期、脉冲强度及卓越脉冲数等参数进行了研究 ,并与以往研究者的结果进行比较 ,以利于近断层区结构的抗震设计 .
Near-fault strong ground motions that resulted in serious structural damage are characterized by directivity effect and pulse-type motion. Large-amplitude and long-period pulses are contained in the velocity time-history traces of near-fault pulse-type records. A reasonable model of equivalent velocity pulse is proposed on the basis of the existed models in this paper to simplify the calculation and analysis. Based on the large amount of collected near-fault strong earthquakes records, the parameters describing equivalent velocity pulse model such as pulse period, pulse intensity and number of predominant pulses are studied, and comparison is made with the results obtained by others models. The proposed model is contributive to the seismic design for structures areas near-fault.

引文

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