超高层建筑气动弹性效应双向受迫振动风洞试验研究

发布时间：2018-01-20 18:18

本文关键词： 超高层建筑风洞试验气动弹性参数风荷载双向受迫振动风致响应　出处：《建筑结构学报》2015年11期 　论文类型：期刊论文

【摘要】：通过双向受迫振动风洞试验对高347 m的长沙世茂广场模型的气动弹性效应进行研究,模拟结构平面两个轴向的一阶振动,同步测量了振动模型上的表面风压和模型顶部位移。在对振动模型横风向和顺风向的气动弹性力分析基础上,识别了该模型气动阻尼比和气动刚度比,计算并分析了气动弹性效应对结构风致响应和等效风荷载的影响。分析结果表明,在100年重现期风速作用下,该模型气动阻尼比为正值,气动刚度为负,气动刚度相对于结构刚度较小,对结构自振频率影响不大。考虑气动弹性参数后,顶部最大位移响应可减小5%,最高居住层最大加速度响应可减小10%,由等效风荷载计算得到的基底总剪力和基底总弯矩减小1.1%左右。分析表明,双向受迫振动风洞试验是一种有效且有实用前景的超高建筑气动弹性参数识别方法。
[Abstract]:The Aeroelastic effect of the 347m model of Shimao Square in Changsha is studied by means of wind tunnel test of bidirectional forced vibration, and the first order vibration of two axial directions of the structure is simulated. The surface wind pressure and the top displacement of the model were measured synchronously. The aerodynamic damping ratio and the aerodynamic stiffness ratio of the model were identified on the basis of the Aeroelastic force analysis of the transverse wind direction and the downwind direction of the vibration model. The effect of Aeroelastic effect on the wind-induced response and equivalent wind load of the structure is calculated and analyzed. The results show that the aerodynamic damping ratio is positive and the aerodynamic stiffness is negative under the wind speed of 100 years. Considering the Aeroelastic parameters, the maximum displacement response of the top can be reduced by 5, and the maximum acceleration response of the highest residential layer can be reduced by 10%. The total shear force and the total bending moment of the base calculated from the equivalent wind load are reduced by about 1.1%. Bidirectional forced vibration wind tunnel test is an effective and promising method for identifying Aeroelastic parameters of ultra-high buildings.
【作者单位】：武汉大学土木建筑工程学院;
【基金】：国家自然科学基金项目(50678137)
【分类号】：TU973.213
【正文快照】： 0引言对于高宽比大、频率低、阻尼小的高柔建筑在强风作用下的风致响应,需要考虑气动弹性效应,特别是气动阻尼比的影响[1],研究气动弹性效应的方法主要有气动弹性模型风洞试验[2-4]和受迫振动风洞试验[5-8]。通过气动弹性模型风洞试验测得的随机响应数据识别的气动阻尼比离散

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