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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。
Some researches on the wind load characteristics of cold-formed thin-walled steel structures have been carried out in China, but there are few wind-induced responses, especially wind-induced response of multi-layer cold-formed thin-walled steel structures with different wind angles. Based on the principle of AR method, the time history of pulsating wind speed is simulated in MATLAB, and the time history of wind pressure is generated by transformation. The finite element model of multi-layer cold-formed thin-walled steel structure is established in ANSYS. The wind-induced dynamic response of the multi-story cold-formed thin-walled steel structure is obtained, and the displacement and acceleration time histories of the top of the structure are obtained and analyzed. The results show that: 1 The correctness of modeling and simulation of wind speed time-lapse is validated by modal analysis and power spectrum comparison; the maximum inter-layer displacement of the two wind directions meet the standard limits of 22.5 °, 45 ° and 67.5 ° The displacement response of the wind direction angle increases in turn and the maximum displacement occurs at a wind direction angle of 90 °. 3 When building a cold-formed thin-walled steel structure, the influence of the wind direction should be taken into consideration and a reasonable layout should be made accordingly.