单层球面网壳结构的风致响应分析

讨论完全二次型组合(CQC)方法和模态加速度法在单层球面网壳结构风致响应计算中的应用,对0.1矢跨比单层球面网壳采用同步多点压力扫描技术进行了风洞试验。根据由脉动风荷载和结构模态得到的广义力功率谱,分别用CQC法和平方-总和-开方法(SRSS)计算了结构的风致响应。检查不同模态数对响应精度的影响以及模态响应分量的相关性,发现SRSS方法对这类结构并不合适,不同模态响应之间的相关性未被考虑在内。位移响应功率谱表明响应的共振分量是显著的,对某些节点甚至比背景分量更加重要。与传统的模态叠加法不同,模态加速度法中可以用剩余柔度的拟静态响应近似补偿截断的高阶模态对响应的贡献。

Wind-induced response analysis of a single-layer latticed dome

This paper discusses the application of the Complete Quadratic Combination(CQC) method and the Mode-Acceleration method to estimate the wind-induce responses of single-layer latticed domes.Wind tunnel tests of a single-layer latticed dome of a rise-span ratio of 0.1 were conducted using the synchronous multi-pressure scanning technique.Based on the spectra of generalized forces obtained from fluctuating wind loads and structural modes,the wind-induced response of the dome were calculated by using the CQC and the Square Root Sum of Square(SRSS),respectively.The effects of different mode-numbers on response accuracy and the correlation among modal response components were examined.It was found that the SRSS is inadequate for this type of structures,and the correlations between modal responses have to be taken into consideration.The spectra of displacement response indicate that the resonant component of the response is significant,and even more so than the background component for some nodes.In contrast to the traditional Mode-Superposition method,in the Mode-Acceleration method the contribution of the truncated high-order modes to response may be compensated approximately by the pseudo-static response of the residual flexibility.