基于结构拓扑的不规则钢桁架体育馆抗倒塌分析
Anti-collapse analysis of irregular steel truss gymnasium based on structural topology
李艳霞 1孙晓岭2
作者信息
- 1. 西安建筑科技大学体育学院,西安 710055;西部绿色建筑国家重点实验室,西安 710055
- 2. 西安建筑科技大学建筑设计研究院,西安 710055
- 折叠
摘要
钢桁架结构的抗倒塌分析方法应与结构拓扑相匹配.为此,选取一不规则(柱网布置与上部桁架分布不规则)钢桁架体育馆进行非线性动力分析.基于柱内轴向荷载的水平与上部悬挑桁架的分布选取了关键构件,并给出了确定分析模型等效荷载时程曲线的方法.通过ABAQUS/Explicit模块模拟关键构件失效后结构的瞬态反应,并根据强度准则与变形准则判定结构是否发生连续性倒塌.分析结果表明,由于Ⓔ轴柱后有面积较大的一部分悬挑结构,Ⓔ轴柱失效产生的动力效应高于其他区域;E1 柱与E3 柱的失效会导致结构的变形或杆件应力比超过限值,建议在 2 层柱间增设支撑或者对Ⓔ轴柱外的悬挑结构布置额外竖向支撑,以此增加结构整体的抗倒塌韧性.
Abstract
The anti-collapse analysis method of steel truss structure should be matched with the structural topology.For this reason,an irregular(column grid layout and upper truss distribution)steel truss gymnasium was selected for nonlinear dynamic analysis.Based on the level of the axial load in the column and the distribution of the upper cantilever truss,the key components were selected and the method of determining the equivalent load time history curve of the analysis model was given.The ABAQUS/Explicit module was used to simulate the transient response of the structure after the failure of the key components,and the occurrence of progressive collapse is judged according to strength and failure criteria.The analysis results show that the dynamic effect of Ⓔ-axis column failure is higher than that of other regions due to the large area of cantilever structure behind Ⓔ-column.The failure of E1 column and E3 column will lead to the deformation of the structure or the stress ratio of the bar exceeding the limit value.It is suggested that additional support should be added between the columns on the second floor or additional vertical support should be arranged for the cantilever structure outside the Ⓔ-axis column,so as to increase the overall collapse resistance of the structure.
关键词
不规则钢桁架/结构拓扑/动力分析/抗倒塌能力Key words
irregular steel truss/structural topology/dynamic analysis/anti-collapse resistance引用本文复制引用
基金项目
西安市科技计划(20GXF0007)
陕西省体育局常规课题(2023564)
西安建筑科技大学校教学改革课题(JG23YB49)
出版年
2024
NETL
NSTL
万方数据