多层冷弯薄壁型钢结构气弹性模型的设计与制作

The Design and Fabrication of Mid- rise Cold- formed Steel Framing System Aeroelastic Model

气弹性模型是研究结构风致响应试验的基础。为进行多层冷弯薄壁型钢结构的风致响应试验,对某4层冷弯薄壁型钢结构气弹模型的设计、制作、模态测试过程进行了详细论述。首先在有限元中建立结构原型,给出气弹性模型设计需要满足的相似准则,然后设计建立气弹性有限元模型,最后对制作出的气弹性模型进行模态测试试验。结果表明:有限元中气弹性模型前3阶频率与原型接近,振型基本相同,主要参数均满足相似准则;制作的气弹性模型主要频率、阻尼比、振型都与原型基本吻合,验证了模型制作的合理性。

The aeroelastic model is the foundation of wind-induced response test,for the study of wind-induced response test of mid-rise steel framing system,its aeroelastic model is necessary. Therefore, the design,fabrication,and modal testing of a 4 floor cold-formed steel framing system aeroelastic model are discussed in detail. First,a structural prototype is established in the finite element method,provide the similarity criterion for the design of the aeroelastic model,then design and establish of the aeroelastic finite element model,in the end,the modal test of the aeroelastic model is made. The results show that：In finite element,the first three order frequency of aeoelrastic model is close to the prototype,vibration mode is basically the same,the main parameters meet the similarity criterion;The frequency,damping ratio and vibration mode of model consistent to the prototype,the rationality of model is verified.