某菱形截面纪念碑风致气弹响应风洞试验研究

发布时间：2019-04-13 13:58

【摘要】：对某高100 m的菱形截面纪念碑进行刚性模型多点同步扫描测压与摆式气弹模型测振风洞试验,进而在测压数据基础上建立频域风荷载模型并采用随机振动分析方法计算结构风振响应,同时应用随机减量技术(RDT)识别了该气弹模型风致振动时的气动阻尼比。当在频响函数中考虑气动阻尼比后的风振响应计算结果和气弹模型试验值具有很好的一致性。由于实际结构振型与摆式模型线性振型存在差异,用振型修正系数修正气弹模型试验结果可得到实际结构风振响应。分析结果表明,刚性模型测压建立荷载模型,结合气弹模型测振识别气动阻尼,代入实际结构频域响应计算方法能够较精确地评估强风作用下低频小阻尼高耸结构的风致气弹响应。
[Abstract]:Wind tunnel tests of rigid model multi-point simultaneous scanning pressure measurement and pendulum Aeroelastic model vibration measurement for a 100 m high diamond cross-section monument are carried out. Then the wind load model in frequency domain is established on the basis of the pressure data and the wind vibration response of the structure is calculated by random vibration analysis method. At the same time, the aerodynamic damping ratio of the Aeroelastic model under wind induced vibration is identified by using random decrement technique (RDT). When the aerodynamic damping ratio is taken into account in the frequency response function, the calculated results of wind-induced vibration response are in good agreement with the experimental values of the Aeroelastic model. Due to the difference between the linear vibration modes of the actual structure and the pendulum model, the wind-induced vibration response of the actual structure can be obtained by modifying the Aeroelastic model test results with the mode shape correction factor. The analysis results show that the load model is established by the rigid model pressure measurement, and the aerodynamic damping is identified by combining the Aeroelastic model vibration measurement. The wind-induced Aeroelastic response of low-frequency low-damping high-rise structures subjected to strong wind can be accurately evaluated by substituting the frequency domain response calculation method for practical structures.
【作者单位】：武汉大学土木建筑工程学院;中信集团武汉市建筑设计院;
【基金】：国家自然科学基金项目(50678137)
【分类号】：TU347;TU311.3

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