多层冷弯薄壁型钢结构房屋风致响应试验  

Wind-induced Response Test of Multi-layer Cold-formed Thin-walled Steel Structure Building

作　　者：褚云朋[1] 伏金蓉 姚勇[1] 王嵘[1] CHU Yunpeng;FU Jinrong;YAO Yong;WANG Rong(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《西南科技大学学报》2023年第1期67-74,共8页Journal of Southwest University of Science and Technology

基　　金：四川省科技厅基础研究项目(2019YJ0322)。

摘　　要：多层冷弯薄壁型钢结构房屋属于风敏感结构,为研究基本风压及风向角等因素对该结构房屋风致响应的影响,对某4层房屋缩尺气弹性模型进行了风洞试验。结果表明:随风向角增加,顶层侧移先增大后减小,风向角为90°时又增大,且为横风向振动所致,但仅当风压达到1.18 kN/m^(2)后顶层侧移才超限,在风向角为45°时各层层间侧移均超限;随风向角增加,加速度先减小后增大,在0°和90°时来流引起的横风向振动对加速度影响明显,当基本风压大于0.6 kN/m^(2)时,建议采用增加阻尼等措施减小加速度过大带来的振动问题;随偏角增加加速度呈非线性变化,功率谱中高阶振型贡献明显,在风致加速度响应计算中应对高阶振动给予更多考虑,且自振频率应避开加速度峰值段的频率。Multi-layer cold-formed thin-walled steel structure buildings are wind-sensitive structures.In order to study the influence of basic wind pressure and wind direction angle on the wind-induced response of the building,a wind tunnel test was carried out on a scaled aeroelastic model of a four-storey building.The results show that with the increase of wind direction angle,the top-level lateral displacement increases first and then decreases,and increases again when the wind direction angle is 90°,which is caused by crosswind vibration.However,only when the wind pressure reaches 1.18 kN/m^(2) can the top-level lateral displacement exceed the limit.And when the wind direction angle is 45°,the lateral displacement between layers exceeds the limit.With the increase of the wind direction angle,the acceleration decreases first and then increases.At the wind direction angle of 0°and 90°,the crosswind vibration caused by inlet flow has an obvious effect on the acceleration.When the basic wind pressure is greater than 0.6 kN/m^(2),it is recommended to increase damping and other measures to reduce the vibration problem caused by excessive acceleration.As the deflection angle increases,the acceleration changes nonlinearly,and the contribution of higher-order modes in the power spectrum is obvious.More consideration should be given to higher-order vibrations in the calculation of wind-induced acceleration response,and the natural frequency should avoid the frequency of the peak acceleration.

关 键 词：多层冷弯薄壁型钢结构房屋 气弹性模型 风致响应 风洞试验 有限元分析 

分 类 号：TU391[建筑科学—结构工程]