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目前复杂网架结构风荷载通常采用刚性模型风洞试验确定,但由于忽略了结构与流体之间的耦合效应,其结果与实际结构存在偏差。气弹模型则可真实反映结构在自然边界层中的响应,但由于网架结构非常复杂,需要适当简化相似准则和选择结构主要响应振型进行设计。基于曹妃甸煤堆防风网架结构,设计1颐50气弹模型。通过应变片测试支架根部内力,得到了B类风场不同风速下网架内力风振系数;通过激光位移计测得顺风向位移响应,求得结构顺风向位移风振系数。最后比较分析了两类风振系数,为同类结构气弹模型设计制作和风振系数计算提供参考。
At present, the wind load of complex grid structure is usually determined by wind tunnel test of rigid model. However, due to neglecting the coupling effect between structure and fluid, the result is different from the actual structure. The aeroelastic model can truly reflect the response of the structure in the natural boundary layer. However, due to the complexity of the grid structure, it is necessary to simplify the similarity criterion and select the structure of the main response mode. Based on Caofeidian coal pile wind grid structure, design 1 Yi 50 aeroelastic model. Through the strain gauge, the internal force of the root of the stent was tested, and the wind-induced vibration coefficient of internal force of the grid was obtained under different wind speeds of Class B wind field. The windward displacement response was measured by the laser displacement meter, and the windward vibration coefficient of the structure was obtained. Finally, two types of wind-induced vibration coefficients are compared and analyzed, which provides references for the design and fabrication of the aeroelastic model of similar structure and the calculation of the wind-induced vibration coefficient.