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超高层建筑横风向位移响应峰值因子研究
王 磊1,2 , 张 伟2 , 陈 凯1,3 , 梁枢果4 , 范玉辉2
摘 要

(1 建筑安全与环境国家重点实验室, 北京 100013; 2 河南理工大学土木工程学院, 焦作 454000;3 国家建筑工程技术研究中心, 北京 100013; 4 武汉大学土木建筑工程学院, 武汉 430072)

摘要: 为了研究超高层建筑横风向位移响应峰值因子的计算方法和变化规律,进行了一系列的多自由度气弹模型风洞试验,测量了横风向位移响应时程。 简要分析了横风向位移响应时程的概率特性,验证了响应时程满足经典极值分布。 继而以经典极值理论结果为基准,检验了峰值因子法、改进的峰值因子法和全时程方法对峰值因子的计算精度。 结果表明,在小折算风速下,基于高斯假定的峰值因子法和全时程方法的计算结果有较大误差;而在折算风速较大时,几种方法的计算结果差别不大。 整体来看,改进的峰值因子法与经典极值理论的计算结果更为相近,在实际工程中可以采用改进的峰值因子法来计算超高层建筑横风向位移响应的峰值因子。 改进的峰值因子法的计算结果表明,超高层建筑横风向位移响应峰值因子随折算风速的增大大致呈“先减小后增大”的趋势,此外,结构阻尼比和结构质量也会影响峰值因子的大小。 最终,将横风向位移响应峰值因子视为折算风速的函数,提出了一个初步的经验公式,供后续研究参考。

关键词: 超高层建筑; 多自由度气弹模型; 风洞试验; 峰值因子; 横风向位移响应

中图分类号:TU973􀆰 2,V211􀆰 7 文献标志码:A 文章编号:1002⁃848X(2022)14⁃0103⁃06

 

DOI:10􀆰 19701 / j􀆰 jzjg􀆰 20200720

 

Study on the peak factor of crosswind displacement response of super high⁃rise building

WANG Lei1,2, ZHANG Wei2, CHEN Kai1,3, LIANG Shuguo4, FAN Yuhui2

(1 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 2 School of Civil Engineering,Henan Polytechnic University, Jiaozuo 454000, China; 3 National Engineering Research Center of Building Technology,Beijing 100013, China; 4 School of Civil & Building Engineering, Wuhan University, Wuhan 430072, China)

Abstract: In order to study the calculation method and change characteristic of the peak factor of crosswind displacementresponse of super high⁃rise building, a series of wind tunnel tests of multiple degrees⁃of⁃freedom aeroelastic models werecarried out, and crosswind displacement response time history of the model was measured. The probability characteristic ofcrosswind displacement response time history was analyzed briefly, and it was proved that the response time history satisfiesthe classical extremum distribution. Then, based on the results of classical extreme value theory, the calculation accuracyof peak factor corresponding to peak factor method, improved peak factor method and full⁃time⁃history method wascompared. The results show that the peak factor method and the full⁃time⁃history method based on the gauss assumptionhave large errors under the small reduced wind speed, but the difference between these methods is not obvious when thereduced wind speed is relatively large. The calculation result of improved peak factor method is most close to the extremevalue theory, so the improved peak factor method can be used to calculate the peak factor of crosswind displacementresponse of super high⁃rise building in actual engineering. The calculation results of improved peak factor method show thatthe peak factor of crosswind displacement response of super high⁃rise building is varied with reduced wind speedsignificantly, showing a trend of " decrease first and increase later" , what’ s more, the structural damping ratio andstructural quality will also influence the value of peak factor. Finally, the peak factor of crosswind displacement response isregarded as a function of reduced wind speed, and a simplified empirical formula was proposed, which can providereference for future research.

Keywords: super high⁃rise building; multiple degrees⁃of⁃freedom aeroelastic model; wind tunnel test; peak factor;crosswind displacement response

∗建筑安全与环境国家重点实验室暨国家建筑工程技术研究中心开放课题基金 ( BSBE2020⁃5),国家自然科学基金(51708186)。
第一作者:王磊,博士,主要从事结构动力学和结构抗风研究,Email:tumuwanglei@ 163. com。
通信作者:范玉辉,博士,主要从事结构抗风和再生混凝土研究,Email:fyhzzdx2003@ 126. com。
 
[引用本文] 王磊,张伟,陈凯,等. 超高层建筑横风向位移响应峰值因子研究[J]. 建筑结构,2022,52(14):103⁃108. WANG Lei,ZHANG Wei,CHEN Kai,et al. Study on the peak factor of crosswind displacement response of superhigh⁃rise building[J]. Building Structure,2022,52(14):103⁃108.
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