環(huán)狀結(jié)構(gòu)橫風(fēng)向風(fēng)振響應(yīng)分析
羅楠，廖海黎，李明水
- 摘 要
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羅楠，廖海黎，李明水（西南交通大學(xué)風(fēng)工程試驗(yàn)研究中心， 成都 610031）［摘要］高層建筑橫風(fēng)向風(fēng)振響應(yīng)備受風(fēng)工程和結(jié)構(gòu)工程領(lǐng)域的關(guān)注，其橫風(fēng)向振動(dòng)主要是旋渦脫落下的渦激共振。主要介紹某環(huán)狀結(jié)構(gòu)橫風(fēng)向渦激共振的形成和影響因素。對(duì)于這種特殊結(jié)構(gòu)，無(wú)法直接由規(guī)范查到斯特羅哈數(shù)，因而不能判定實(shí)際結(jié)構(gòu)發(fā)生橫風(fēng)向渦激共振的起振風(fēng)速。通過(guò)氣彈模型試驗(yàn)獲得結(jié)構(gòu)的渦振起振風(fēng)速，并測(cè)試了各個(gè)風(fēng)向角下結(jié)構(gòu)頂部的加速度響應(yīng)，把試驗(yàn)結(jié)果換算到實(shí)際結(jié)構(gòu)，分析了橫風(fēng)向渦激共振的影響因素。試驗(yàn)結(jié)果表明：對(duì)于此類結(jié)構(gòu)，影響最大的是風(fēng)向角，其次是結(jié)構(gòu)的阻尼比和來(lái)流的紊流度。因而建議此類結(jié)構(gòu)在建造時(shí)使其易于發(fā)生橫向風(fēng)振的方位避免與主風(fēng)向垂直。［關(guān)鍵詞］環(huán)狀結(jié)構(gòu)； 渦激共振； 氣彈模型； 風(fēng)向角中圖分類號(hào)：TU312+.1，TU973.2+13 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)08-0032-04Analysis on across windinduced dynamic responses for a ring structureLuo Nan, Liao Haili, Li Mingshui(Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, China)Abstract: Across wind-induced dynamic responses on tall buildings, which is mainly caused by vortex-induced vibration, are drawn much attention in the fields of wind engineering and structure engineering. The formation and influencing factors of vortex-induced vibration for a ring structure were introduced. Specifications do not provide the Strouhal number for this particular structure, so the start-up wind velocity of across vortex-induced vibration can not be determined. In this study, the start-up wind velocity of vortex-induced vibration was obtained by the aeroelastic model test and acceleration responses in cases of various wind directions were investigated. Then test results were applied in the real structure to analyze the influencing factors of across vortex-induced vibration. The results demonstrate that the wind direction has greatest impact on vortex-induced vibration for the ring structure, while the damping ratio of the structure and the turbulence intensity of the flow have smaller impact. Therefore, the situation that the position of ring structures is perpendicular to the main wind direction should be avoided.Keywords: ring structure; vortex-induced vibration; aeroelastic model; wind direction參考文獻(xiàn)［1］洪小健,顧明.順風(fēng)向等效風(fēng)荷載及響應(yīng)——主要國(guó)家建筑風(fēng)荷載規(guī)范比較［J］. 建筑結(jié)構(gòu), 2004,34(7):39-43.［2］張相庭.結(jié)構(gòu)順風(fēng)向風(fēng)振的規(guī)范表達(dá)式及有關(guān)問(wèn)題的分析［J］. 建筑結(jié)構(gòu), 2004,34(7):33-35.［3］KWOK K C S, MELBOURNE W H. Wind-induced lock-in excitation of tall structures［J］. Journal of the Structural Division, 1981, 107 (ST1):65-82.［4］KAREEM A. Fluctuating wind loads on buildings［J］. Journal of the Engineering Mechanics Division, 1982, 108（6）:1086-1102.［5］趙文欽.圓形截面高聳構(gòu)筑物的橫向風(fēng)振研究［J］.西安冶金建筑學(xué)院學(xué)報(bào),1983,33(1):1-27.［6］梁樞果,夏法寶,鄒良浩，等.矩形高層建筑橫風(fēng)向風(fēng)振響應(yīng)簡(jiǎn)化計(jì)算［J］.建筑結(jié)構(gòu)學(xué)報(bào),2004, 25(5): 48-54.［7］蔣洪平,張相庭.變截面高聳結(jié)構(gòu)的橫向風(fēng)振研究［J］.振動(dòng)與沖擊,1994, 49(1):46-54.［8］WILLIAMSON C H K, GOVARDHAN R. Vortex-induced vibrations［J］. Annual Review of Fluid Mechanics,2004, 36（1）:413-455.［9］LIE H, KAASEN K E. Modal analysis of measurements from a large-scale VIV model test of a riser in linearly sheared flow［J］. Journal of Fluids and Structures,2006, 22（4）: 557-575.［10］GB 50009—2001建筑結(jié)構(gòu)荷載規(guī)范［S］. 2006年版. 北京:中國(guó)建筑工業(yè)出版社,2006.［11］黃本才,汪叢軍.結(jié)構(gòu)抗風(fēng)分析原理及應(yīng)用［M］.上海:同濟(jì)大學(xué)出版社,2008.［12］SARPKAYA T. A critical review of the intrinsic nature of vortex-induced vibrations［J］. Journal of Fluids and Structures,2004,19（4）: 389-447.
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