论文部分内容阅读
根据大跨屋盖结构多振型参与结构风振,等效静力风荷载存在多目标的特点,提出时域多目标等效静力风荷载的分析方法。该方法的基本思路是:利用时域分析得到的位移响应时程,计算结构的广义恢复力时程,对广义恢复力进行POD分解,得到广义恢复力的本征模态,以此构造多目标等效静力风荷载的基本向量;引入约束方程组和权值因子,用加权约束最小二乘法得到基本向量的最优组合系数,从而得到多目标等效静力风荷载。该方法能够再现风振响应特点,在保证关键目标等效精度的同时,得到较合理的多目标等效静力风荷载分布。最后,将该方法应用于某大跨屋盖,验证了该文方法的有效性和精度。
According to the multi-objective wind-induced vibration of the multi-mode structure of the long-span roof structure and the equivalent static wind load, an analysis method of multi-objective equivalent static wind load in the time domain is proposed. The basic idea of this method is: to calculate the generalized restoration force time-history of the structure by using the displacement response time-history obtained from the time-domain analysis, and to perform POD decomposition of the generalized restoration force to obtain the eigenmode of the generalized restoration force so as to construct a multi-target The equivalent vector of static wind load is introduced. By introducing the constraint equations and weighting factors, the optimal combination coefficient of the basic vector is obtained by using the weighted constrained least squares method to obtain the multi-objective equivalent static wind load. The method can reproduce the characteristics of wind-induced vibration and obtain a more reasonable multi-objective equivalent static wind load distribution while ensuring the equivalent accuracy of key targets. Finally, the method is applied to a large span roof to verify the effectiveness and accuracy of the proposed method.