超高层建筑横风向气动阻尼比简化估算方法研究

发布时间：2018-01-27 11:51

本文关键词： 超高层建筑多自由度气弹模型气动阻尼比协调气动阻尼比涡致振动　出处：《工程力学》2017年01期 　论文类型：期刊论文

【摘要】：通过3种高宽比、3种粗糙度流场、多种质量-阻尼参数的多自由度气弹模型风洞试验,分析了折算风速、风场粗糙度、高宽比、结构质量、结构阻尼比和涡振位移等因素对横风向气动阻尼比的影响。分析表明,正气动阻尼比与结构阻尼比负相关,而负气动阻尼比绝对值与结构阻尼比正相关,结构质量与气动阻尼比绝对值负相关,风场越粗糙或模型高宽比越小负气动阻尼比越不显著。整体来看,气动阻尼比本身不足以评价气弹响应的显著程度,以气动阻尼比本身作为经验公式的拟合对象有很大局限性。最后提出了协调气动阻尼比的概念,在此基础上建立了改进的气动阻尼比经验拟合公式,该拟合公式考虑了以上各因素对气动阻尼比的影响,为气动阻尼比的估算方法提供了新的思路。
[Abstract]:Through wind tunnel tests of three kinds of aspect ratio and three kinds of roughness flow field and various mass-damping parameters, the converted wind speed, wind field roughness, aspect ratio and structure mass are analyzed. The results show that the positive aerodynamic damping ratio is negatively correlated with the structure damping ratio, while the negative aerodynamic damping ratio is positively correlated with the structure damping ratio. There is a negative correlation between the structure mass and the aerodynamic damping ratio. The rougher the wind field or the smaller the model aspect ratio, the less significant the negative aerodynamic damping ratio is. Overall, the aerodynamic damping ratio itself is not enough to evaluate the significance of the Aeroelastic response. Taking the aerodynamic damping ratio itself as the fitting object of the empirical formula has great limitations. Finally, the concept of coordinated aerodynamic damping ratio is proposed, and an improved empirical fitting formula for the aerodynamic damping ratio is established. The effect of the above factors on the aerodynamic damping ratio is taken into account in the fitting formula, which provides a new idea for the estimation of the aerodynamic damping ratio.
【作者单位】：河南理工大学土木工程学院;武汉大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51178359,51308195) 河南省科技厅科技攻关项目(132102210252)
【分类号】：TU973.213
【正文快照】： 对超高层建筑横风向涡振而言,气动阻尼比的影响常常不可忽略。Kareem和Gurley的试验研究发现,当折算风速大于6时,就必须考虑气动阻尼比的影响才能得到较精确风振响应[1]。Marukawa等[2]通过单自由度气弹模型风洞试验,采用随机减量技术分析了矩形截面高层建筑顺、横向气动阻尼

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