大跨度网壳屋盖结构动力特性及地震反应分析

英文篇名：ANALYSIS OF DYNAMIC PROPERTY AND EARTHQUAKE RESPONSES OF LONG-SPAN LATTICE SHELL ROOF STRUCTURE
中文刊名：钢结构
英文刊名：Steel Construction
作者：鲍华
英文作者：Bao Hua(China Railway Siyuan Survey and Design Group Co.Ltd ; Wuhan 430063 ; China)
中文关键词：大跨度屋盖 ; 网壳结构 ; 动力特性 ; 地震反应分析
英文关键词：long-span roof ; latticed shell structures ; dynamic property ; earthquake response analysis
出版日期：2009-02-22
机构：中铁第四勘察设计院集团有限公司;
年：2009
期：02
出版单位：钢结构

摘要

针对武汉市某学校游泳馆的大跨度网壳屋盖结构实际工程,利用有限元软件ANSYS建立了三维有限元模型,研究网壳结构的动力特性及地震反应,并对其动力特性和地震反应的影响因素进一步探讨。分析结果表明,大跨度网壳屋盖结构的自振频率密集,振动以水平振型为主,第一振型为水平振型;随着支座刚度的减小,结构的低阶自振周期显著增大;随着结构阻尼比增大,网壳结构的地震反应相应减小。
The 3-D model of a school natatorium in Wuhan is set up by ANSYS.The dynamic properties and earthquake responses of roof structure are investigated,and influencing factors of its dynamic properties and earthquake responses are further studied.The results show that the natural frequencies of latticed shell structures are dense,and the structure's vibration are dominated by the level vibration modes;and its first mode shape is level.With a decrease in the stiffness of support bracket,the structure's low-self-vibration period is increased obviously;and earthquake responses of latticed shell structures are decreased correspondingly with an increase in the structure damping ratio.

引文

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