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超高層建筑橫風(fēng)向位移響應(yīng)峰值因子研究
王 磊1,2 , 張 偉2 , 陳 凱1,3 , 梁樞果4 , 范玉輝2
摘 要

(1 建筑安全與環(huán)境國(guó)家重點(diǎn)實(shí)驗(yàn)室, 北京 100013; 2 河南理工大學(xué)土木工程學(xué)院, 焦作 454000;3 國(guó)家建筑工程技術(shù)研究中心, 北京 100013; 4 武漢大學(xué)土木建筑工程學(xué)院, 武漢 430072)

摘要: 為了研究超高層建筑橫風(fēng)向位移響應(yīng)峰值因子的計(jì)算方法和變化規(guī)律,進(jìn)行了一系列的多自由度氣彈模型風(fēng)洞試驗(yàn),測(cè)量了橫風(fēng)向位移響應(yīng)時(shí)程。 簡(jiǎn)要分析了橫風(fēng)向位移響應(yīng)時(shí)程的概率特性,驗(yàn)證了響應(yīng)時(shí)程滿足經(jīng)典極值分布。 繼而以經(jīng)典極值理論結(jié)果為基準(zhǔn),檢驗(yàn)了峰值因子法、改進(jìn)的峰值因子法和全時(shí)程方法對(duì)峰值因子的計(jì)算精度。 結(jié)果表明,在小折算風(fēng)速下,基于高斯假定的峰值因子法和全時(shí)程方法的計(jì)算結(jié)果有較大誤差;而在折算風(fēng)速較大時(shí),幾種方法的計(jì)算結(jié)果差別不大。 整體來(lái)看,改進(jìn)的峰值因子法與經(jīng)典極值理論的計(jì)算結(jié)果更為相近,在實(shí)際工程中可以采用改進(jìn)的峰值因子法來(lái)計(jì)算超高層建筑橫風(fēng)向位移響應(yīng)的峰值因子。 改進(jìn)的峰值因子法的計(jì)算結(jié)果表明,超高層建筑橫風(fēng)向位移響應(yīng)峰值因子隨折算風(fēng)速的增大大致呈“先減小后增大”的趨勢(shì),此外,結(jié)構(gòu)阻尼比和結(jié)構(gòu)質(zhì)量也會(huì)影響峰值因子的大小。 最終,將橫風(fēng)向位移響應(yīng)峰值因子視為折算風(fēng)速的函數(shù),提出了一個(gè)初步的經(jīng)驗(yàn)公式,供后續(xù)研究參考。

關(guān)鍵詞: 超高層建筑; 多自由度氣彈模型; 風(fēng)洞試驗(yàn); 峰值因子; 橫風(fēng)向位移響應(yīng)

中圖分類號(hào):TU973?? 2,V211?? 7 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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

∗建筑安全與環(huán)境國(guó)家重點(diǎn)實(shí)驗(yàn)室暨國(guó)家建筑工程技術(shù)研究中心開(kāi)放課題基金 ( BSBE2020?5),國(guó)家自然科學(xué)基金(51708186)。
第一作者:王磊,博士,主要從事結(jié)構(gòu)動(dòng)力學(xué)和結(jié)構(gòu)抗風(fēng)研究,Email:tumuwanglei@ 163. com。
通信作者:范玉輝,博士,主要從事結(jié)構(gòu)抗風(fēng)和再生混凝土研究,Email:fyhzzdx2003@ 126. com。
 
[引用本文] 王磊,張偉,陳凱,等. 超高層建筑橫風(fēng)向位移響應(yīng)峰值因子研究[J]. 建筑結(jié)構(gòu),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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