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对典型大跨屋盖结构风振响应开展参数灵敏度研究,目的是定量评估各种不确定因素对结构风振响应不确定性的贡献率,获得不确定性在风荷载与风振响应间的传递规律。首先结合Sobol’方差分解法和拉丁超立方抽样技术建立适用于大跨屋盖结构的全局灵敏度分析方法,通过多次采样风洞试验获得大量脉动风荷载时程,作为灵敏度分析的输入变量。合理建立结构参数概率统计模型,分别应用局部和全局灵敏度分析方法对典型大跨屋盖结构极值风振响应进行了参数灵敏度分析,研究发现:多个参数共同随机变化时,结构极值风振响应近似服从广义极值分布;结构风振响应的不确定性主要受风荷载不确定性控制;结构风振响应的参数灵敏度与共振响应在总响应中的比重有关,共振响应占比越大,结构对风荷载越敏感。
A parametric sensitivity study is conducted on the wind-induced response of a typical long-span roof structure with the purpose of quantitatively evaluating the contribution of various uncertainties to the uncertainty of the wind-induced vibration response of the structure and obtaining the transfer of uncertainty between the wind load and the wind-induced response law. Firstly, a global sensitivity analysis method suitable for long-span roof structures is established based on Sobol’s Variance Decomposition and Latin Hypercube Sampling. A large amount of pulsating wind load time history is obtained through multiple sampling wind tunnel tests as input variables for sensitivity analysis. Probabilistic and statistical models of structural parameters are reasonably established. Sensitivity analysis of the maximum wind-induced vibration response of typical long-span roof structures is carried out using local and global sensitivity analysis respectively. It is found that when the multiple parameters are randomly changed, The response approximates to the generalized extreme value distribution. The uncertainty of wind-induced vibration response is mainly controlled by the uncertainty of wind load. The sensitivity of structure wind-induced vibration response is related to the proportion of resonance response in the total response. The larger the proportion of resonance response, Structure is more sensitive to wind load.