考虑地震动转动分量作用的砌体结构易损性分析

Vulnerability Analysis of Masonry Structure Considering the Action of Rotational Component of Ground Motion

为考虑地震动转动分量对砌体结构地震响应和易损性的影响,基于ABAQUS有限元软件平台建立了村镇区域典型单层砌体结构有限元模型,选取层间位移角最大值作为性能指标来分析地震动转动分量对结构响应及易损性的影响;首先,选取三组典型地震动分别进行调幅,研究了结构在不同强度地震动平动和转动分量作用下的地震响应;其次,在PEER数据库选取80条地震动,研究了地震动转动分量对砌体结构地震易损性的影响,建立了地震易损性曲线。结果表明:(1)同时考虑地震动平动分量和转动分量作用时的结构层间位移角最大值比仅考虑地震动平动分量作用时有明显增大,随着PGA的增大,转动分量对结构的影响有增大的趋势;(2)由于地震动转动分量的作用,结构发生不同极限破坏状态时的超越概率均高于仅考虑平动分量作用的情况。该研究成果可为村镇砌体结构抗震设计与性能提升提供理论参考。

In order to consider the influence of seismic rotational component on the seismic response and vulnerability of masonry structures,the finite element model of typical single-layer masonry struc-tures in villages and towns is established based on ABAQUS finite element software platform.The maximum value of inter-story drift angle is selected as the performance index to analyze the influence of seismic rotational component on structural response and vulnerability;Firstly,three groups of typi-cal ground motions are selected for amplitude modulation,and the seismic response of the structure under the action of translational and rotational components of the ground motions with different intensi-ties is studied;Secondly,eighty ground motions from the PEER database are extracted to study the influence of rotational component of ground motion on structural seismic vulnerability,and the seismic vulnerability curve is established.The results show that:(1)the maximum value of the inter-story drift angle of the structure considering both the translational component and the rotational component of the ground motion increases significantly than that considering only the translational component of the ground motion.With the increase of PGA,the influence of the rotational component on the struc-ture tends to increase;(2)Due to the influence of the rotational component of ground motion,the ex-ceedance probability of different limit failure states of the structure is higher than that considering only the translational component of ground motion.The research results can provide a theoretical reference for seismic design and performance improvement of masonry structures in villages and towns.