大跨度屋盖结构风振系数随厚度变化研究  

Analysis of the Span Roof Structures Wind Vibration Coefficient with Different Thickness

作　　者：郑群圣 朱检 

机构地区：[1]永州市建设工程质量安全监督站,湖南永州425000 [2]中建五局装饰幕墙有限公司,长沙410000

出　　处：《湖南城市学院学报（自然科学版）》2017年第2期20-24,共5页Journal of Hunan City University:Natural Science

摘　　要：为研究大跨度薄壳屋盖结构屋盖厚度与风振系数关系问题,首先建立了时域内大跨度薄壳屋盖结构空间三维风振分析模型.然后通过FORTRAN软件平台编制基于谐波叠加法的脉动风载荷程序.最后采用ANSYS瞬态动力计算得到屋盖结构的风振系数值,并分析出该类屋盖结构的风振系数与屋盖厚度之间的变化趋势.结果表明,谐波叠加法是模拟风荷载的有效方法,大跨度屋盖结构的位移风振系数值随厚度的减小而增大,其中跨中部位为受风荷载影响最为显著.数值算例验证了本文方法的正确性与有效性,为屋盖结构的抗风设计提供理论依据和工程参考意义.By using harmonic superposition method combined with FORTRAN program, we simulated wind load, got fluctuating wind speed curve and fluctuating wind pressure curve, used the finite element method combined with ANSYS, conducted three dimensional wind vibration analysis in time domain on a span roof structure, obtained its wind vibration coefficient and determined its most unfavorable part of wind induced vibration. At the same time, taking the wind vibration coefficient variation trend into account at different thickness, we got the variation with thickness changes. The results show that harmonic superposition method is an effective way to simulate fluctuating wind in time analysis. Span roof structures wind coefficient increases with the thickness decrease, whose central part is the most unfavorable part of wind induced vibration. Therefore, this paper provides a reference for the dome structure in wind resistant design and an analysis method for large span structures wind resistant design.

关 键 词：谐波叠加法 有限元方法 厚度变化 穹顶结构 风振系数 

分 类 号：O334.1[理学—一般力学与力学基础]