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采用自回归(AR)模型方法对具有空间相关性的脉动风荷载时程进行模拟。将模拟得到的风荷载时程加载到结构有限元模型中,通过动力时程分析方法分析获得结构响应时程。利用虚拟激励法识别得到风荷载功率谱密度。通过风荷载功率谱密度识别得到脉动风荷载相干函数。针对识别得到的相干函数与频率的关系,提出不同的方法对相干函数进行优化,得到与模拟所用风荷载相干函数相近的结果,验证了该识别方法的可行性。
The autoregressive (AR) model was used to simulate the fluctuating wind loads with spatial correlation. The simulated wind load time-history is loaded into the finite element model of the structure, and the structural response time-history is obtained through dynamic time history analysis. Using virtual excitation method to identify wind load power spectral density. The pulsating wind load coherence function is identified by the wind power spectral density. Aiming at the relationship between the identified coherence function and frequency, different methods are proposed to optimize the coherence function, and the results similar to the coherence function of the wind load used in the simulation are obtained. The feasibility of the identification method is verified.