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(1 同濟(jì)大學(xué)土木工程防災(zāi)國家重點(diǎn)實(shí)驗(yàn)室，上海 200092； 2 杭州市市政設(shè)施監(jiān)管中心，杭州 321000)

［摘要］基于一棟高層建筑的剛性模型表面壓力測(cè)量風(fēng)洞試驗(yàn)數(shù)據(jù)，分析了高寬比較大且截面為方形的高層建筑橫風(fēng)向風(fēng)效應(yīng)的共同特征。得到如下結(jié)論：高層建筑橫截面為方形時(shí)，其橫風(fēng)向風(fēng)荷載主要由規(guī)則性旋渦脫落導(dǎo)致的尾流激勵(lì)構(gòu)成，為窄帶隨機(jī)激勵(lì)；當(dāng)高層建筑的高寬比較大時(shí)，基階固有頻率相對(duì)較低；當(dāng)高層建筑兼具方形截面和大高寬比這兩個(gè)特征時(shí)，其基階固有頻率可能接近其尾流的旋渦脫落頻率，從而發(fā)生劇烈的橫風(fēng)向渦激共振。建筑結(jié)構(gòu)截面的小幅增大可使這種劇烈的橫風(fēng)向渦激共振得到有效控制。上部外形的適當(dāng)處理，也可能有效降低高層建筑的橫風(fēng)向等效風(fēng)荷載。低矮群樓的出現(xiàn)將在一定程度上影響高層建筑的風(fēng)荷載。

［關(guān)鍵詞］高層建筑；風(fēng)荷載；風(fēng)效應(yīng)；橫風(fēng)向

Across-wind loads and responses of square high-rise buildings with large aspect ratios

Quan Yong¹, Chen Bin², Gu Ming¹(1 State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China；2 Hangzhou Municipal Installation Supervision and Administration Center, Hangzhou 312000, China)

Abstract:Based on pressure measurement wind tunnel test data of a real high-rise building, the common aspects of across-wind loads and responses of square high-rise buildings with large aspect ratios are analyzed. The calculated results indicate that the across-wind loads of high-rise buildings with square sections are induced mainly by vortex shedding and are narrow-band random processes. The basic natural frequency of high-rise buildings with large aspect ratios should be low. When a high-rise building has square section and large aspect ratio, it is prone to large across-wind response. A little enlarging of the building section can suppress the large across-wind vortex-induced resonance. The appropriate treatment of the building shape at its upper part may also reduce the across-wind loads effectively. The emergence of low surrounding buildings will affect wind loads in a certain extent.

Keywords:high-rise building; wind loads; wind-induced response; across-wind

*上海市浦江人才計(jì)劃項(xiàng)目(08PJ14095)；國家自然科學(xué)基金項(xiàng)目(50878159,90715040,50321003)。

作者簡介：全涌，博士，副教授，Email: quanyong@#edu.cn。

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