方形截面超高层建筑全风向气动阻尼的试验研究

发布时间：2018-03-06 06:00

本文选题：超高层建筑　切入点：气动阻尼　出处：《湖南大学学报(自然科学版)》2015年07期 　论文类型：期刊论文

【摘要】：超高层建筑质量小、阻尼低,极易在设计风速下产生明显的气动弹性效应,出现明显的气动阻尼.考虑一阶线性弯曲模态,制作了方形截面超高层建筑的单自由度气动弹性模型,高宽比8∶1,模型比例1∶600,进行风洞试验测量了各风速下建筑顶部的加速度响应,采用随机减量方法对全风向下方形截面超高层建筑的气动阻尼进行识别.其中,顺风向和横风向的气动阻尼结果与文献结果趋势吻合良好.研究结果表明:当风向角在84°~90°范围内时(90°为横风向),气动阻尼特性与横风向结果趋势一致;当风向角在0°~12°范围内时(0°为顺风向),气动阻尼特性与顺风向结果趋势一致;在某些特定的风向角下(例如16.5°),临界风速降低,气动负阻尼的起始风速也降低.
[Abstract]:Because of its small mass and low damping, the super high-rise building is prone to produce obvious Aeroelastic effect and obvious aerodynamic damping under the design wind speed. The first order linear bending mode is considered. A single degree of freedom Aeroelastic model for super-tall buildings with square cross-section is made. The aspect ratio is 8: 1 and the model ratio is 1: 600. The acceleration response of the top of the building under various wind speeds is measured by wind tunnel tests. In this paper, the aerodynamic damping of super tall buildings with all wind down square cross-section is identified by random decrement method. The results of aerodynamic damping in the downwind and crosswind directions are in good agreement with the results in the literature. The results show that when the wind direction angle is in the range of 84 掳to 90 掳, the aerodynamic damping characteristics are consistent with the results of the cross-wind direction. When the wind direction angle is in the range of 0 掳to 12 掳, the aerodynamic damping characteristic is consistent with the result of the downwind direction, and the critical wind speed decreases at some specific wind direction angles (such as 16.5 掳C), and the initial negative aerodynamic damping wind speed also decreases.
【作者单位】：湖南大学风工程试验研究中心;
【基金】：湖南省高校创新平台开放基金资助项目(湘教通(2012)595) 国家重点基础研究发展计划项目(2015CB057701,2015CB057702)
【分类号】：TU973.213

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