远场长周期地震动特征  

Study on characteristics of far-field long period ground motion

作　　者：谭潜[1,2] 李英民 向渊明[2] 罗文文 卜长明[3] 王丽萍[3] TAN Qian;LI Yingmin;XIANG Yuanming;LUO Wenwen;BU Changming;WANG Liping(School of Civil Engineering,Chongqing University,Chongqing 400045,China;CMCU Engineering Co.,Ltd.,Chongqing 400039,China;School of Civil Engineering and Architecture,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]中机中联工程有限公司,重庆400039 [3]重庆科技学院建筑工程学院,重庆401331

出　　处：《地震工程与工程振动》2019年第5期177-188,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51478068,51808087);教育部‘春晖计划’合作科研项目(Z2015147);重庆市自然科学基金项目(cstc2018jcyjAX0695);重庆科技学院重点项目培育基金项目(CK2015Z27)~~

摘　　要：大量的地震震害证明了一类比较特殊的远场长周期地震动的存在,其对高层、超高层以及大跨结构等长周期结构的影响已经不可忽视。本文以远场长周期地震动引发的震害为基础,对其产生机制及涵义进行简要的阐述;对界定筛选出的这类特殊的远场长周期地震动的传统‘三要素’特性展开分析;从时域和频域上对其能量特性、频率非平稳特性进行了分析。分析结果表明,远场长周期地震动的传统特性具有低幅值、长持时、频谱长周期段幅值较大的特点;能量聚集于低频段、总量大、分布均匀、累积时间长;频率非平稳特性显著,与近断层长周期地震动及常规地震动区别明显,在模拟远场长周期地震动以及生成人工地震动作为长周期结构输入时均要考虑到此类地震动的特殊特性。The existence of a special far-field long period ground motion(FFLPGM)was proved by the large number of earthquake damages,and its influence on the long period structures such as high-rise building structures,super tall building structures and other long-span structures can’t be neglected.In this paper,based on FFLPGM induced earthquake damage,the generation mechanism and implication of the earthquake were briefly described.And then,the basic characteristics of this kind of special FFLPGM which has been classified ago were analyzed.Including the three main factors characteristic that are used to descript the ground motions,the energy behavior and frequency non-stationary characteristic in time domain and frequency domain were analyzed.The analysis results show that the FFLPGMs have low amplitude,long duration and its response spectra have large spectral amplitude in the long period stage for traditional characteristics.The energy is concentrated in low frequency band,with large amount,uniform distribution and its accumulation time is long.The frequency non-stationary characteristic is remarkable,which is obviously different from the near-fault long period ground motions and the conventional ground motions.For this,in simulating FFLPGM and generating the artificial FFLPGM as the input of long period structures are all need to consider these special characteristics.

关 键 词：远场长周期地震动 地震动特性 反应谱 能量持时 非平稳特性 

分 类 号：P315.5[天文地球—地震学] P315.9[天文地球—固体地球物理学]