摘要
为了研究存在损伤支撑构件的钢筋混凝土框架结构在地震作用下的竖向连续倒塌性能,从美国太平洋地震工程研究中心(PEER)数据库中选取了3条远场地震波、4条近场地震波以及1条人工地震波作为地震输入,利用等效轴力变化模拟损伤柱失效过程,基于OpenSees有限元分析平台,采用时程分析法对中柱在地震作用下逐渐失效的平面框架结构的抗竖向倒塌性能进行了分析。结果表明:在8度罕遇地震(加速度峰值为0.4 g,g为重力加速度)作用下,损伤柱快速失效,在相同的失效时间下,竖向加速度峰值与地震波总能量竖向分量能显著增加结构竖向响应,从而加大结构的竖向倒塌风险;相对于不考虑地震作用时,考虑地震作用的中柱竖向位移峰值和中柱相邻梁端受拉钢筋应变峰值都明显增大;随着中柱失效时间的增大,动力效应的影响逐渐减弱,地震作用对剩余结构的影响逐渐减小。
In order to study the vertical continuous collapse performance of reinforced concrete frame structures with damaged supporting members under seismic action,three far-field seismic waves,four near-field seismic waves and one artificial seismic wave were selected from database of Pacific Earthquake Engineering Research Center(PEER)as seismic inputs.The failure process of the damaged column was simulated by using the equivalent axial force variation.Based on the OpenSees platform,the vertical collapse resistance of plane frame structures whose columns gradually failed under seismic action was analyzed by time history analysis method.The results show that under the influence of 8 degree rare earthquake(peak acceleration is 0.4 g,g is gravitational acceleration),the damaged column fails rapidly;under the same failure time,the vertical peak acceleration and the vertical component of seismic total energy can significantly increase the vertical response of structures,thus increasing the risk of vertical collapse of the structure;compared with the case without considering seismic action,the peak vertical displacement of the middle column and the peak strain of tensioned steel bar at the end of adjacent beam of middle column increase significantly;with the increase of failure time of the middle column,the influence of dynamic effect is gradually weakened,and the influence of seismic action on the residual structure is gradually reduced.
作者
何庆锋
聂玉莲
邓颖婷
HE Qing-feng;NIE Yu-lian;DENG Ying-ting(College of Civil Engineering,Hunan University,Changsha 410082,Hunan,China;Hunan Provincial Key Laboratory on Damage Diagnosis for Engineering Structures,Hunan University,Changsha 410082,Hunan,China)
出处
《建筑科学与工程学报》
CAS
北大核心
2020年第6期64-72,共9页
Journal of Architecture and Civil Engineering
基金
国家重点研发计划项目(2016YFC0701308)。
