考虑共振补偿的网壳风振响应综合模态法

Quasi-mode Method with Resonance for Wind Vibration Response of Latticed Shell Structures

分析了网壳结构中自振频率、阻尼比等因素对共振响应在总风振响应中贡献的影响,利用考虑高阶振型共振响应的综合模态法计算了单层网壳的风振响应,讨论了计算综合模态时所需的振型数。针对结构自振频率密集的特性,研究了考虑振型互相关贡献的必要性、影响振型互相关贡献的因素和计算振型互相关贡献所需的振型数。最后,通过具体的算例分析验证了相关结论。

The effect of the factors such as self-vibration frequency and the damp ratios of the shell structures on the ratio of the resonance response is analyzed to the wind-induced vibration response. The quasi-mode method considering the resonance response of the high modes is used to calculate the wind-induced vibration response of single-layer latticed shell and the mode numbers needed for calculating the quasi-mode is discussed. Because the self-frequencies are very close, the necessity of considering the mode cross-correlation contribution, the effect factors to the mode cross-correlation contribution and the mode numbers for calculating the mode cross-correlation contribution are studied. At last, through the computation of the detailed example, some conclusions are verified.