基于增量动力法的电梯对重系统地震易损性分析  

Seismic fragility analysis of elevator counterweight system based on incremental dynamic analysis

作　　者：韩庆华 张晓龙[3] 芦燕 王力晨 HAN Qinghua;ZHANG Xiaolong;LU Yan;WANG Lichen(Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration(Tianjin University),Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of China Ministry of Education(Tianjin University),Tianjin 300350,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]中国地震局地震工程综合模拟与城乡抗震韧性重点实验室(天津大学),天津300350 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300350 [3]天津大学建筑工程学院,天津300350

出　　处：《地震工程与工程振动》2022年第5期53-62,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52022067,U1939208)。

摘　　要：曳引电梯作为高层建筑内重要的非结构构件,其抗震安全性能不容忽视。历次震害调查表明:电梯的抗震性能特别是其对重系统的抗震性能较为薄弱。目前对于电梯对重系统抗震性能的研究中,对其震后功能状况进行评估和震害预测的研究较少。文中以某大型综合体建筑为工程背景,基于已有振动台试验建立了3种典型对重位置的对重系统数值分析模型,提出了对重系统损伤指标,考虑主体结构对重系统动力响应的影响,采用增量动力法开展了对重系统地震易损性分析。研究发现:对重下部导靴远离导轨支架时,对重更易发生脱轨现象,在8度设防、8度罕遇地震作用下对重达到脱轨状态的概率分别为2.72%和94.47%。基于电梯位置等概率分布的计算方法综合考虑3种典型对重位置的对重系统失效概率,得到8度设防地震、8度罕遇地震作用下,对重系统达到脱轨状态的概率分别为2.45%和81.79%。研究结果表明:电梯对重系统的易损性与地震发生时对重所处的位置有关,其抗震性能有待提高。文中从宏观角度描述了地震动强度与电梯对重系统损伤程度之间的关系,可为电梯对重系统震后损伤评估和震害预测提供理论依据。As an important nonstructural component in high-rise buildings,the seismic performance of traction elevators is very important. Seismic damage surveys have shown that the seismic performance of elevators,especially the seismic performance of elevator counterweight systems,is relatively weak. In the current research on the seismic performance of elevator counterweight system,there are few studies on its post-earthquake function evaluation and disaster prediction. In this paper,the numerical analysis model of the counterweight system at three typical counterweight positions is established which based on existing shaking table tests and the damage index of counterweight system is proposed. Considering the influence of the main structure on the dynamic response of the counterweight system,the seismic fragility analysis is carried out by using the incremental dynamic method. It is found that the counterweight is more prone to derailment when the lower guide shoe is far away from the rail support,and the probability of the counterweight reaching the derailment state under the action of the 8-degree fortification and 8-degree rare earthquake is 2.72% and 94.47%,respectively. Based on the calculation method of equal probability distribution of elevator position,the probability of failure of the counterweight system is 2.45% and 81.79% under the 8-degree fortification earthquake and 8-degree rare earthquake,respectively. The results show that the fragility of the elevator counterweight system is related to the location of the counterweight when earthquake occurs,and its seismic performance needs to be improved. This paper describes the relationship between ground motion intensity and damage degree of elevator counterweight system from a macro perspective,which provides a theoretical basis for post-earthquake damage assessment and earthquake damage prediction of elevator counterweight system.

关 键 词：非结构构件 电梯对重系统 增量动力法 地震易损性 抗震性能 

分 类 号：TU857[建筑科学]