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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.
In order to study the relation between the roof thickness and the wind-induced vibration coefficient of long-span thin-shell roof structure, a three-dimensional wind-induced vibration model of long-span thin-walled roof structure in time domain is established firstly, and then based on FORTRAN software platform The wind load factor of pulsating wind load is obtained.Finally, the wind-induced vibration coefficient of roof structure is calculated by ANSYS transient dynamic force and the trend of wind-induced vibration coefficient and roof thickness of the roof structure is analyzed.The results show that the harmonic superposition Method is an effective method to simulate wind load. The value of wind-induced vibration coefficient of long-span roof structure increases with the decrease of thickness, of which the mid-span is the most significant affected by wind load. Numerical examples show that the proposed method is correct Sexual and effectiveness, provide theoretical basis and engineering reference significance for wind-resistant design of roof structure.