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(海南大學(xué)土木建筑工程學(xué)院, ?？?570228)

摘要: 為研究超高層建筑橫風(fēng)向脈動(dòng)風(fēng)荷載譜特性,在 B、D 兩類紊流風(fēng)場中開展了不同長寬比矩形剛性模型測(cè)壓試驗(yàn). 結(jié)果表明:橫風(fēng)向脈動(dòng)風(fēng)荷載特性主要受紊流風(fēng)場、氣動(dòng)外形和旋渦脫落等因素影響,矩形柱截面的長寬比變化將影響功率譜幅值及能量分布. 當(dāng)矩形柱截面長寬比小于 3 時(shí),橫風(fēng)向脈動(dòng)風(fēng)荷載譜特性主要受旋渦脫落控制,但當(dāng)長寬比超過 3 后,矩形柱側(cè)面分離再附流動(dòng)的影響逐漸加強(qiáng),具體表現(xiàn)在:功率譜峰值減小、帶寬增大及高頻區(qū)出現(xiàn)較小譜峰. 根據(jù)風(fēng)洞試驗(yàn)結(jié)果和矩形柱橫風(fēng)向脈動(dòng)風(fēng)荷載譜特性,提出了歸一化橫風(fēng)向脈動(dòng)風(fēng)荷載譜模型,該經(jīng)驗(yàn)公式物理意義明確、形式簡潔,有一定的工程參考意義.

關(guān)鍵詞: 矩形超高層建筑; 橫風(fēng)向脈動(dòng)風(fēng)荷載; 風(fēng)洞試驗(yàn); 歸一化譜模型

中圖分類號(hào):TU973+. 213 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)10-0015-06

DOI:10. 19701 / j. jzjg. 20211293

Normalized cross-wind fluctuating wind load spectrum model of rectangular super high-rise buildings

QIU Xingfeng, ZENG Jiadong, ZHANG Zhitian

(College of Civil Engineering and Architecture, Hainan University, Haikou 570228, China)

Abstract: In order to study the characteristics of cross-wind fluctuating wind load spectrum of super high-rise buildings,pressure tests of rectangular rigid models with different aspect ratios were carried out in two types of turbulent wind fields Band D. The results show that the characteristics of cross-wind fluctuating wind load are mainly affected by factors such asturbulent wind field, aerodynamic shape and vortex shedding. The aspect ratio change of the rectangular column section willaffect the power spectrum amplitude and energy distribution. When the aspect ratio of the rectangular column section is lessthan 3, the cross-wind fluctuating wind load spectrum characteristic is mainly controlled by the vortex shedding, but when itexceeds 3, the influence of the side separation and attached flow of the rectangular column gradually strengthens, which isshown in: the peak power spectrum decreases smaller, increased bandwidth, and smaller peaks appearing in thehigh-frequency region. According to the wind tunnel test results and the characteristics of the cross-wind fluctuating windload spectrum of the rectangular column, a normalized cross-wind fluctuating wind load spectrum model was proposed. Theempirical formula has clear physical meaning and concise form, which has certain engineering reference significance.

Keywords: rectangular super high-rise building; cross-wind fluctuating wind load; wind tunnel test; normalizedspectrum model

∗海南省自然科學(xué)基金資助項(xiàng)目(520RC545、520CXTD433),國家自然科學(xué)基金資助項(xiàng)目(52068020、51938012、52268012).

第一作者:丘杏逢,碩士研究生,主要從事結(jié)構(gòu)抗風(fēng)研究,Email:1638705812@ qq. com.

[引用本文] 丘杏逢,曾加?xùn)|,張志田. 矩形超高層建筑歸一化橫風(fēng)向脈動(dòng)風(fēng)荷載譜模型[ J]. 建筑結(jié)構(gòu),2023,53(10):15-20. QIU Xingfeng,ZENG Jiadong,ZHANG Zhitian. Normalized cross-wind fluctuating wind load spectrum modelof rectangular super high-rise buildings[J]. Building Structure,2023,53(10):15-20.