摘要
为了研究不同地震作用下、不同自振周期以及支撑加固下结构的地震反应变化规律,选取3条常规地震动和3条远场类谐和长周期地震动,先对其进行反应谱特性分析,然后通过希尔伯特-黄变换(Hilbert-Huang transform)得到各条地震动的Hilbert能量谱,进而得到Hilbert能量谱用于比较分析不同地震动的能量特性。在此基础上,使用SAP2000建立3层和20层框架结构及其支撑加固结构的有限元模型并对其进行地震动作用下的弹性时程分析。结果表明:长自振周期的结构在远场长周期地震动作用下的地震响应远远大于常规地震动作用下结果,并且长自振周期结构的地震反应相比短自振周期结构更为明显;支撑加固对短自振周期结构的加固效果非常显著,而对长自振周期结构的加固效果不明显,且使得结构最大层间位移角所在楼层上移,引起结构中上部楼层存在安全隐患。
In order to study the variation of seismic response under different ground motions,different natural vibration periods and structures under support and reinforcement,three conventional ground motions and three far-field harmonic and long-period ground motion were selected,and the response spectrum characteristics were analyzed first,then the Hilbert spectrum of each ground motion was obtained by HHT(Hilbert-Huang transform),and the Hilbert energy spectrum is obtained to compare and analyze the energy characteristics of different ground motions. On this basis,SAP2000 was used to establish the finite element model of the 3-layers and 20-layers frame structures and their supporting reinforcement structures,and the elastic time history analysis under ground motion was carried out. The results show that the seismic response of the long self-vibration period under far-field long-period ground motion is much larger than that under conventional ground motion,and the seismic response of long self-vibration periodic structure is more obvious than the short self-vibration period structure. The reinforcement effect of the support reinforcement on the short self-vibration period structure is very significant,while the reinforcement effect on the long self-vibration period structure is not obvious,and the floor where the maximum interlayer displacement angle of the structure is moved up,causing safety hazards in the upper part of the structure.
作者
周栋
范存新
ZHOU Dong;FAN Cun-xin(School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China)
出处
《科学技术与工程》
北大核心
2019年第12期278-287,共10页
Science Technology and Engineering
基金
国家自然科学基金(51478286)资助
关键词
远场类谐和长周期地震动
反应谱特性分析
Hilbert能量谱
支撑加固结构
弹性时程分析
far-field harmonic and long-period ground motion
response spectrum analysis
Hilbert energy spectrum
support reinforcement structure
elastic time history analysis
