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针对大跨空间结构中多振型参与风振响应特点和工程应用需要,提出针对多个风向的多目标等效静风荷载分析方法。根据所有风向的平均风荷载(或者风振响应极值)分布之间的相似性指标,将所有风向分为若干个风向区,计算各风向区的风振包络响应;在每个风向区内,选择平均风荷载分布和结构主导振型惯性力作为构造多目标等效静风荷载的基本向量,根据最小二乘法,得到基本向量的最优组合系数,从而得到针对多个风向、多个等效目标的等效静风荷载。将该方法用于某大型科技新馆,分析结果表明:根据各风向下屋面平均风压系数分布间的相关系数,36个风向角仅需分成3个风向区,且各风向区等效静风荷载作用下的静力响应与实际动力响应包络响应吻合较好,验证了所提方法的计算精度和工程应用的便利性。
Aiming at the characteristics of multi-vibrational participation in wind-induced vibration response and engineering application in long-span space structures, a multi-objective equivalent static wind load analysis method for multiple wind directions is proposed. According to the similarity index between the average wind load (or the extreme value of wind-induced vibration response) in all wind directions, all the wind directions are divided into several wind direction zones, and the wind vibration envelope responses of each wind direction zone are calculated. In each wind direction zone , The average wind load distribution and the structure dominant vibration mode inertial force are selected as the basic vectors for constructing the multi-objective equivalent static wind load. According to the least squares method, the optimal combination coefficient of the basic vector is obtained, and the wind speed, Effective target static wind load. The method is applied to a large new science and technology museum. The analysis results show that according to the correlation coefficients of the average wind pressure coefficient distribution of roofs in different directions, the 36 wind directions need only be divided into three wind directions and the equivalent static wind The static response under load is in good agreement with the envelope response of the actual dynamic response, which verifies the accuracy of the proposed method and the convenience of engineering application.