近断层地震动作用下多塔超高层建筑地震易损性分析  

Seismic vulnerability analyses of multi-tower super high-rise buildings under near fault ground motions

作　　者：蒋莉[1] 刘震 马兴亮 JIANG Li;LIU Zhen;MA Xingliang(School of Civil Engineering and Architecture,Changzhou Institute of Technology,Changzhou 213032,China;School of Management Science and Engineering,Shandong Technology and Business University,Yantai 264005,China)

机构地区：[1]常州工学院土木建筑工程学院,江苏常州213032 [2]山东工商学院管理学科与工程学院,山东烟台264005

出　　处：《振动与冲击》2024年第5期273-282,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52208461)。

摘　　要：近断层地震动是一类含有高能速度脉冲的特殊地震动,其周期长、破坏性强、能量集中。多塔超高层建筑相比单塔超高层受力更加复杂,自振周期更长,速度脉冲能量更易输入结构,且可能对各塔造成较大的响应差异,但针对此类特殊情况抗震规范并未出台相应条文。对此,以一个三塔超高层建筑为例,以多种近断层、非近断层地震动,及高能速度脉冲为地震动输入,利用大型有限元软件进行地震时程分析,并以层间位移角和最大位移为主要分析对象,对主塔副塔结构进行地震易损性分析。结果表明:算例结构在各种地震动作用下,均可以满足“小震不坏、中震可修、大震不倒”要求;但近断层地震动对于结构产生的响应远大于非近断层地震动;比较各种损伤状态的损伤概率,近断层地震动较非近断层地震动平均上升11.79%。进一步分析其中高能速度脉冲发现:速度脉冲是造成近断层地震动对结构损伤的重要因素,较小的速度脉冲就有可能对主塔产生较为严重的结构损伤。Near fault seismic motion is a special type of ground motion containing high-energy velocity pulses,with long periods,strong destructiveness and concentrated energy.Compared to single-tower super high-rise buildings,multi-tower super high-rise buildings bear more complex forces,have longer natural vibration periods,easier input of velocity pulse energy into structure,and may cause larger differences among various towers’responses.However,there are no corresponding provisions in aseismic codes for such special situations.Here,taking a 3-tower super high-rise building as an example,various near fault and non-near fault ground motions as well as high-energy velocity pulses were taken as seismic inputs.Large type finite element software was used for seismic time-history analyses,and interlayer displacement angle and maximum displacement were taken as the main analysis objects to do seismic vulnerability analyses of main tower and auxiliary tower structures.The results showed that the example structure can meet requirements of“no damage during small earthquakes,repairable during moderate earthquakes and no collapse during large earthquakes”under various seismic actions;structure responses to near fault ground motions are much larger than those to non-near fault ground motions;comparing damage probabilities of various damage states,structural damage probabilities under near fault ground motions averagely increase by 11.79%compared to those under non-near fault ground motions;high energy velocity pulses are an important factor to cause structural damages under near fault ground motions,smaller velocity pulses may cause more severe main tower’s structural damages.

关 键 词：近断层地震动 多塔超高层 地震的易损性 动力响应 

分 类 号：TU318[建筑科学—结构工程]