摘要
为了进一步研究西藏地区典型单层砌体结构的抗震性能,基于振动台试验数据和增量动力分析(IDA)对其进行了地震易损性研究。首先,建立了试验原型结构的有限元模型,并从动力特性、加速度反应和结构损伤等方面与振动台试验对比分析,验证了有限元模型的可靠性;其次,以地震动峰值加速度和最大层间位移角分别作为地震动强度参数和结构性能参数,对结构进行了增量动力分析;最后,以增量动力分析结果对结构进行了地震易损性分析,评估结构各损伤状态的超越概率。结果表明,该结构在4种极限状态所对应的峰值加速度分别为0.265、0.566 g、0.736 g、0.862 g,均大于IX度区的抗震设防要求,并且表现出较低的失效概率以及较好的抗倒塌性能,证明了该砌体结构的安全性,能满足规范中的抗震设防目标。
In order to further study the seismic performance of typical single-story masonry structures in Tibet,its seismic fragility studies are conducted based on shaking table test data and incremental dynamic analysis(IDA).Firstly,the finite element model of the prototype structure is established and compared with the shaking table test results from dynamic characteristics,acceleration responses and structural damages to verify the reliability of the fi-nite element model.Secondly,the incremental dynamic analysis of the structure is carried out,which takes the peak ground acceleration and the maximum inter-storey drift angle as the intensity measure and the damage mea-sure respectively.Finally,the seismic fragility of the structure is analyzed based on the results of incremental dy-namic analysis,and the probability of exceedance is quantitatively evaluated.The results show that the correspond-ing peak accelerations of the structure in the state of slight damage,moderate damage,severe damage and close to collapse are 0.265,0.566 g,0.736 g,0.862 g,which are bigger than the seismic fortification requirements of the IX degree area.In addition,it shows a probability of exceedance and a good anti-collapse performance,which proves the safety of the masonry structure and can meet the seismic fortification target in the specification.
作者
周强
余天昀
陈东
肖晖
赵文洋
ZHOU Qiang;YU Tianyun;CHEN Dong;XIAO Hui;ZHAO Wenyang(School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)
出处
《自然灾害学报》
CSCD
北大核心
2022年第3期124-131,共8页
Journal of Natural Disasters
基金
国家自然科学基金项目(51968047,51608249)。
关键词
砌体结构
IDA分析
振动台试验
易损性曲线
有限元分析
masonry structure
IDA analysis
shaking table test
fragility curves
finite element analysis
