摘要
为研究不同隔震层设计方法对地铁车辆段上盖隔震结构抗震性能的影响,基于位于8度抗震区的某地铁车辆段工程,以传统隔震结构设计方法及以基底剪力最小为优化目标的设计方法指导隔震层设计,建立整体结构弹塑性有限分析模型,分析结构的层剪力、层间位移角等,并通过增量动力分析研究损伤模式。结果表明,随着隔震层刚度的增加,上部结构的减震效果减弱,下部结构地震响应减小,当以基底剪力最小为优化目标时,结构的减震机理为调谐质量耗能减震,下部结构受到上部结构的调谐质量阻尼效应。在1.0g地震作用下,传统结构和优化结构的隔震装置发生位移超限的破坏概率和拉应力超限的破坏概率分别为13.5%和50%;在0.6g地震作用下,优化结构和传统结构中下部结构发生中等破坏的概率分别为27.1%和32.8%,上部结构发生轻微破坏的概率分别为26.9%和14%。研究结果可为同类结构工程提供指导。
To investigate the influence of different isolation layer design methods on the seismic performance of the isolation structure above the subway depot,based on a metro depot project located in the 8-degree seismic zone,the traditional isolation structure design method and the design method with the minimum base shear force as the optimization objective are used to guide the design of the isolation layer.The elastoplastic finite element analysis model of the whole structure is established,the story shear force and story drift angle of the structure are analyzed,and the damage mode is studied by incremental dynamic analysis.The findings indicate that as the increase of the stiffness of the isolation layer,the damping capacity of the upper structure is weakened,and the seismic response of the lower structure is reduced.When the minimum base shear force is taken as the optimization objective,the damping mechanism of the structure is tuned mass energy dissipation,and the lower structure is subjected to the tuned mass damping effect of the upper structure.Under the action of 1.0g earthquake,the failure probabilities of displacement overrun and tensile stress overrun of the isolation devices in the traditional structure and optimized structures are 13.5%and 50%respectively.Under the action of 0.6g earthquake,the probabilities of moderate damage in the middle and lower structures of the optimized structure and the traditional structure are 27.1%and 32.8%respectively,and the probabilities of slight damage in the upper structures are 26.9%and 14%respectively.The research results can provide guidance for similar structural engineering.
作者
郗宜君
XI Yijun(China Railway First Group Building&Installation Engineering Co.,Ltd.,Xi’an 710054,Shaanxi,China)
出处
《建筑施工》
2024年第6期827-832,共6页
Building Construction
基金
陕西省自然科学基金(2023-JC-QN-0617)
中铁一局集团有限公司A类课题(2021A-050)。
关键词
参数优化
地铁车辆段
隔震结构
时程分析
增量动力分析
地震易损性
parameter optimization
metro depot
isolation structure
time history analysis
incremental dynamic analysis
seismic vulnerability
