不同风向角下多层冷弯薄壁型钢结构风致响应数值模拟

Wind-induced Response Numerical Simulation of Multilayer Cold-formed and Thinwalled Steel Structure under Different Wind Angle

国内对冷弯薄壁型钢结构风载特性研究已有部分成果,但是风致响应研究较少,特别是不同风向角下多层冷弯薄壁型钢结构的风致响应研究。本文基于AR法原理,在MATLAB中模拟脉动风速时程,通过转化生成结构各高度处的风压时程,并在ANSYS中建立多层冷弯薄壁型钢结构有限元模型,计算不同风向角下多层冷弯薄壁型钢结构的风致动力响应,得到结构顶层的位移、加速度时程,并进行分析。结果表明:1通过模态分析和功率谱对比验证了建模及模拟风速时程的正确性;2五个风向的最大层间位移均满足规范限值,22.5°、45°、67.5°三个风向角的位移响应依次增大,最大位移出现在90°风向角;3在修建冷弯薄壁型钢结构时,应考虑风向带来的影响,据此进行合理布局。

There are some researches on the load characteristics of wind of the structure in the domestic, while few in the researches on the wind-induced response, especially in the researches on the wind-induced response of muhilayer cold-formed and thin-walled steel structure in different wind angle. In this paper, the principle of linear filtering method based on AR, fluctuating wind speed process is simulated in MATLAB, wind pressure of the height on structure is created through the transformation, and the finite element model of muhilayer cold-formed and thin- walled steel structure is built in ANSYS, wind-induced dynamic response of muhilayer cold-formed and thin-walled steel structures is calculated under different wind angle to get the top displacement and acceleration response of structure, then the data are analyzed. The results show that： ①） the correctness of the modeling and simulation of wind velocity time history are verified by modal analysis and power spectrum comparison; ② the maximum interlayer displacement of the five wind drift angle can meet the specification limits, the displacement responses of 22.5°, 45°, 67.5° are increased in order, the maximum displacement occurs on the 90° wind angle; ③ in the construction of cold-formed and thin-wall steel structures, the influence of wind direction should be considered, and distributing should be done according to the above. Keywords：