某超高层结构伸臂桁架在罕遇地震下的抗震性能分析  

Seismic performance analysis of outrigger in a super high-rise structure under rare earthquakes

作　　者：赵玉红 杨青顺[1] ZHAO Yuhong;YANG Qingshun(School of Civil Engineering and Water Resources,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学土木水利学院,青海西宁810016

出　　处：《青海大学学报》2024年第5期72-77,共6页Journal of Qinghai University

基　　金：国家自然科学基金项目(51878233)。

摘　　要：为了解伸臂桁架在罕遇地震下的耗能情况,以某8度区框架-核心筒-伸臂桁架超高层结构为研究对象,采用最小二乘加权调幅法选取7条地震波,基于Perform-3D弹塑性分析软件分析罕遇地震工况下各构件的塑性耗能。结果表明:连梁和伸臂桁架的塑性耗能总量相对均衡,平均占总耗能的73%。随着地震输入能量的增大,伸臂桁架的耗能比例呈上升趋势,从7.4%增加至30%,而连梁的耗能比例呈下降趋势,从75%减小至34%。伸臂桁架耗能的增加减小了连梁的损坏,验证了可将伸臂桁架视为超高层结构“结构保险丝”的观点。研究结果可为优化伸臂桁架性能,推动优化后的伸臂桁架在实际工程中的应用提供理论参考。A super high-rise structure of a frame-core tube-outrigger in an 8-degree zone is taken as research object to investigate the energy consumption of outrigger under rare earthquakes.Seven seismic waves are selected by using the least squares weighted amplitude modulation method.The plastic energy consumption of each component under rare earthquakes is analyzed by using Perform-3D elastoplastic analysis software.The results are as follows: The total plastic energy consumption of coupling beam and outrigger is relatively balanced, accounting for 73% of total energy consumption on average.With the increase of earthquake input energy, the energy consumption proportion of outrigger shows an upward trend, increasing from 7.4% to 30%, while that of coupling beam decreases from 75% to 34%.The increase in energy consumption by outrigger reduces the damage to coupling beam, verifying that outrigger is considered as a "structural fuse" for high-rise structures.The research results can provide theoretical reference for optimizing the performance of outrigger and promoting the application of the optimized outrigger in practical engineering.

关 键 词：超高层结构 伸臂桁架 抗震分析 塑性耗能 

分 类 号：TU973.1[建筑科学—结构工程]