本文選題：高層建筑 + 矩形截面��； 參考：《建筑結(jié)構(gòu)學(xué)報(bào)》2016年10期

【摘要】：通過(guò)剛性模型風(fēng)洞測(cè)壓試驗(yàn),對(duì)短邊迎風(fēng)和長(zhǎng)邊迎風(fēng)時(shí)的矩形截面高層建筑表面風(fēng)壓特性及作用機(jī)理進(jìn)行研究。對(duì)比了不同風(fēng)向角下建筑表面風(fēng)壓分布及相關(guān)特性:短邊迎風(fēng)時(shí),錐形渦是建筑側(cè)面風(fēng)壓脈動(dòng)的主要誘因,側(cè)面脈動(dòng)風(fēng)壓較大值出現(xiàn)在底邊緣附近的瓣?duì)顓^(qū)域內(nèi),該區(qū)域內(nèi)風(fēng)壓互相關(guān)性顯著;長(zhǎng)邊迎風(fēng)時(shí),旋渦脫落是導(dǎo)致建筑側(cè)面風(fēng)壓脈動(dòng)的主要因素,側(cè)面吸力較大值集中在迎風(fēng)前緣附近,且風(fēng)壓橫向互相關(guān)性突出�；陲L(fēng)壓時(shí)程的高階矩,探討了建筑表面風(fēng)壓非高斯脈動(dòng)特性:短邊迎風(fēng)時(shí),風(fēng)壓非高斯區(qū)位于迎風(fēng)面角部、錐形渦作用區(qū)及尾流作用區(qū);長(zhǎng)邊迎風(fēng)時(shí),非高斯區(qū)位于側(cè)面迎風(fēng)前緣附近的分離區(qū)。分析了建筑側(cè)面脈動(dòng)風(fēng)壓譜和風(fēng)壓相干性,結(jié)果表明:短邊迎風(fēng)時(shí),建筑側(cè)面風(fēng)壓脈動(dòng)能量主要集中在低頻段,風(fēng)壓強(qiáng)相干區(qū)域僅存在于迎風(fēng)前緣附近;長(zhǎng)邊迎風(fēng)時(shí),旋渦脫落使得建筑側(cè)面脈動(dòng)風(fēng)壓譜和風(fēng)壓橫向相干函數(shù)均在折減頻率0.1處出現(xiàn)峰值,加之該頻率所對(duì)應(yīng)相位角接近0°,使得建筑側(cè)面出現(xiàn)強(qiáng)烈且同步的風(fēng)壓脈動(dòng);短邊迎風(fēng)和長(zhǎng)邊迎風(fēng)時(shí)錐形渦及旋渦脫落在建筑兩側(cè)誘導(dǎo)產(chǎn)生的風(fēng)壓脈動(dòng)均為反相位,對(duì)結(jié)構(gòu)抗風(fēng)較為不利。
[Abstract]:In this paper, the wind pressure characteristics and action mechanism of rectangular high-rise building with short and long edges are studied by wind tunnel test with rigid model. The distribution of wind pressure on the building surface under different wind direction angles and its related characteristics are compared. When the short side is upwind, the conical vortex is the main inducement of the wind pressure pulsation on the side of the building, and the larger value of the wind pressure on the side of the building appears in the flap region near the bottom edge. The vortex shedding is the main factor leading to the wind pressure pulsation of the building side, and the lateral suction is concentrated near the front edge of the upwind, and the cross-correlation of the wind pressure is obvious. Based on the high order moments of wind pressure history, the characteristics of non Gao Si pulsation of wind pressure on the building surface are discussed. The non Gao Si region of wind pressure is located at the corner of the upwind surface, the conical vortex zone and the wake acting zone, and the long edge windward zone. The non-Gao Si region is located near the front edge of the lateral windward. The spectrum of fluctuating wind pressure and the coherence of wind pressure on the side of building are analyzed. The results show that when the short side is upwind, the fluctuating energy of the wind pressure on the side of the building is mainly concentrated in the low frequency band, and the coherent region of the wind pressure exists only near the front edge of the wind, and when the long side is upwind, Vortex shedding makes the peak value of fluctuating wind pressure spectrum and transverse coherence function of wind pressure at the reduced frequency 0.1, and the phase angle of the frequency is close to 0 擄, which results in strong and synchronous wind pressure pulsation on the side of the building. The wind pressure pulsation induced by the conical vortex and vortex shedding on both sides of the building is inverse phase, which is unfavorable to the wind resistance of the structure.
【作者單位】： 同濟(jì)大學(xué)建筑設(shè)計(jì)研究院(集團(tuán))有限公司;同濟(jì)大學(xué)土木工程學(xué)院建筑工程系;
【基金】：國(guó)家自然科學(xué)基金青年基金項(xiàng)目(51408353) 上海市青年科技啟明星計(jì)劃(15QB1404800)
【分類號(hào)】：TU973.213

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