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桅杆结构因微风作用而导致的疲劳破坏时有发生,了解结构所受的实际动力风荷载是研究结构风致疲劳的一个前提。文中以桅杆结构为例,阐述了高耸结构动力风荷载反演的思路,建立了桅杆结构二维动力风荷载等效线性识别的模型。采用基于模态分析法的动态荷载识别方法和基于精细时程积分法的精细模态识别法,利用结构在模拟风荷载下有限点的动力响应反演了作用在结构上的动态荷载。算例仿真的结果表明,文中的方法可以满足桅杆结构荷载识别的要求。
The fatigue failure of the mast structure caused by the breeze sometimes occurs. It is a prerequisite to study the wind-induced fatigue of the structure by knowing the actual dynamic wind load on the structure. In this paper, the mast structure is taken as an example to describe the thinking of dynamic wind load inversion of towering structure, and the equivalent linear identification model of two-dimensional dynamic wind load of mast structure is established. A dynamic load identification method based on modal analysis method and a fine modal identification method based on precise time integration method are used to inverse the dynamic loads acting on the structure by the finite element dynamic response under the simulated wind loads. The simulation results show that the method in this paper can meet the requirements of mast structure load identification.