高层建筑气动弹性模型风洞试验研究

发布时间：2018-04-14 17:17

本文选题：高层建筑 + 气动弹性模型　；参考：《湖南大学学报(自然科学版)》2016年01期

【摘要】：以高层建筑为研究背景,制作了气动弹性模型,通过风洞试验测得结构的时程响应结果,采用频谱分析求得结构的动力特性,采用自然激励技术法(NExT)和ARMA模型时序法以及改变模态阶数的方法获得结构的气动阻尼比,研究了结构气动阻尼比随风速的变化规律.在强风下,对顺风向的加速度响应时程结合滤波方法,消除横风向能量转移的影响,同时发现了涡激共振现象.考虑气动阻尼影响的情况下,刚体模型测压和测力得到的峰值加速度响应结果,与气动弹性模型风洞试验结果十分接近,验证气动弹性模型风洞试验结果的正确性.对于刚体模型,不考虑气动阻尼时,峰值加速度比气动弹性模型试验结果大很多,差值最大达到41%,但在某种工况下,气动阻尼的影响使结构的响应值增大,验证了考虑气动耦合作用在高层抗风研究中的必要性.
[Abstract]:Aeroelastic model is made in the background of high-rise building. The time-history response of the structure is measured by wind tunnel test, and the dynamic characteristics of the structure are obtained by spectrum analysis.The natural excitation technique (NExT), the ARMA model time series method and the method of changing the modal order are used to obtain the aerodynamic damping ratio of the structure. The variation of the aerodynamic damping ratio with the wind speed is studied.In the strong wind, the time-history filtering method is combined with the downwind acceleration response to eliminate the influence of crosswind energy transfer, and the vortex-induced resonance phenomenon is also found.Considering the influence of Aeroelastic damping, the results of peak acceleration response obtained by rigid body model pressure measurement and force measurement are very close to those of Aeroelastic model wind tunnel test, which verifies the correctness of Aeroelastic model wind tunnel test results.For rigid body model, when aerodynamic damping is not considered, the peak acceleration is much larger than the result of Aeroelastic model test, and the maximum difference is up to 41%. However, under a certain condition, the effect of aerodynamic damping increases the response value of the structure.The necessity of considering the aerodynamic coupling in the study of high-rise wind resistance is verified.
【作者单位】：湖南大学土木工程学院;香港城市大学土木与建筑工程系;
【基金】：国家自然科学基金资助项目(51178179) 国家自然科学重大项目(91215302)~~
【分类号】：TU973.2

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