摘要
通过对乌鲁木齐宝能城282.4m超高层钢结构进行动力弹塑性时程分析,研究了结构在大震下的动力响应、结构耗能分布及关键构件的塑性发展。分析结果表明：在大震作用下,结构的最大层间位移角小于规范限值;结构底部6层及三个加强层伸臂布置的屈曲约束支撑（BRB）在大震下均进入屈服,导致结构所承受的地震作用大幅下降,减小了结构的地震反应;由于在关键部位布置了BRB,给结构提供了合理的刚度,地震下整体刚度下降较慢,主要抗侧构件极少进入屈服,框架柱基本未屈服;屈曲约束支撑和框架梁是结构主要的耗能构件,其中1~6层Y向BRB及10层伸臂桁架是BRB耗能的主要区域。
The dynamic elastic-plastic time-history analysis was conducted on 282.4 meters high super high-rise steel structure for Baoneng in Urumchi to study the structure＇s dynamic response, dissipating energy distribution anti plastic development of key components under rare earthquake. Analysis results show that under rare earthquake, the maximum structural interlayer displaeenaent angle is less than the standard limit. The buckling-restrained braces （BRBs） arranged at bottom six stories and in outriggers of three strengthening floors yield under rare earthquake to lead the greatly decrease of base shear force of the structure and reduction of the seismic response of the structure. Buckling-restrained braces arranged at key positions provide reasonable structural stiffness, so the overall stiffness decreases slowly, very few main lateral resistance members go into yield stage and the frame columns basically do not yield. The buckling-restrained braces and the frame beams are the basic energy dissipated components. BRBs in Y direction from 1 to 6 stories and outriggers at 10th story are the main energy dissipation areas.
出处
《建筑结构》
CSCD
北大核心
2016年第17期78-83,98,共7页
Building Structure
关键词
屈曲约束支撑
超高层钢结构
弹塑性分析
buckling-restrained brace （BRB）
super high-rise steel structure
elastic-plastic analysis
