超大和罕遇地震下水工框架结构性能及其减震的对比
Comparison of performance and shock absorption of hydraulic frame structures under extremely large earthquake and rare earthquake
姜坤 1杨青顺2
作者信息
- 1. 青海大学土木水利学院,青海西宁 810016
- 2. 青海大学土木水利学院,青海西宁 810016;青海省建筑节能材料与工程安全重点实验室,青海西宁 810016
- 折叠
摘要
为了解水工框架结构在超大和罕遇地震下的破坏特征及防屈曲支撑对该结构抗震性能的改善效果,以某工程的水工框架结构为例,利用MSC Marc建立有限元模型,对土耳其7.8级地震和罕遇地震下水工框架结构的性能及防屈曲支撑对水工框架结构抗震性能的改善效果进行了对比分析.结果表明:(1)在土耳其地震作用下,水工框架结构的楼层位移、层间位移角及大梁挠度较罕遇地震下大幅增加,梁柱节点新增塑性铰,结构破坏加剧.(2)防屈曲支撑对罕遇地震下水工框架结构抗震性能的改善效果明显,启闭大梁的挠度满足了规范的限值.(3)防屈曲支撑对土耳其地震下水工框架结构抗震性能的改善效果不佳.研究结果可为罕遇地震下利用防屈曲支撑改善水工框架结构抗震性能提供数据参考.
Abstract
To explore the damage characteristics of hydraulic frame structures under extremely large and rare earthquake and the improvement effects of buckling-restrained braces(BRB)on their seismic performance,a hydraulic frame structure of a project is taken as an example,and a finite ele-ment model is established by using MSC Marc.Therefore,the performance of hydraulic frame struc-tures and the improvement effects of BRB on the seismic performance of the structure are compared and analyzed under the 7.8 magnitude earthquake in Turkey and rare earthquake.The results are as follows:(1)Compared with rare earthquake,the floor displacement,inter-story displacement angle and girder deflection of hydraulic frame structure under the 7.8 magnitude earthquake in Turkey in-crease significantly.The new plastic hinge is added at the beam-column joints,which intensifies the structural damage.(2)BRB has an obvious effect on the seismic performance of hydraulic frame structures under rare earthquake.The deflection of opening and closing girder meets the limit value of the code.(3)BRB is not effective in improving the seismic performance of hydraulic frame struc-ture under the 7.8 magnitude earthquake in Turkey.The research results can provide data reference for the utilization of BRB to improve the seismic performance of hydraulic frame structures under rare earthquake.
关键词
水工框架结构/土耳其地震/罕遇地震/有限元模型/防屈曲支撑Key words
hydraulic frame structure/Turkey earthquake/rare earthquake/finite element model/buckling-restrained brace(BRB)引用本文复制引用
基金项目
青海省科学技术厅项目(2018-0302-ZJC-0111)
青海省创新平台建设专项项目(2018-ZJ-T01)
出版年
2024
NETL
NSTL
万方数据