- 摘 要
-
（西南交通大學(xué)土木工程學(xué)院，成都 610031）
［摘要］針對某大跨度飄篷鋼結(jié)構(gòu)，為保證合理的風(fēng)荷載取值，進(jìn)行了考慮看臺(tái)干擾效應(yīng)的風(fēng)荷載分析。構(gòu)建了混合型網(wǎng)格模型，壁面為貼體O-Grid?；?/span>CFX的多重分區(qū)全隱式耦合算法，利用非線性k-ε的EARSM湍流模型模擬了建筑風(fēng)場，分析了靜風(fēng)壓系數(shù)、流場特征、不同風(fēng)向角下風(fēng)壓變化規(guī)律。研究表明：迎風(fēng)時(shí)看臺(tái)的阻滯作用會(huì)導(dǎo)致飄篷風(fēng)吸力增長近1倍；背風(fēng)時(shí)，看臺(tái)的撞擊擴(kuò)散導(dǎo)致飄篷上下表面風(fēng)壓反向抵消，風(fēng)壓減小。結(jié)果轉(zhuǎn)換為設(shè)計(jì)可用的體型系數(shù)，將其和相關(guān)規(guī)范進(jìn)行了對比，吻合性較好，為工程設(shè)計(jì)提供了參考。
［關(guān)鍵詞］懸挑結(jié)構(gòu)；風(fēng)荷載；數(shù)值分析；干擾效應(yīng)；CFD；k-ε；EARSM
中圖分類號：TU323.4， TU312.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號：1002-848X(2011)03-0114-04
Analysis on wind load of large cantilevered roof considering grandstand interference
Yu Zhixiang, Zhao Shichun, Wu Hao
(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China）
Abstract:A large cantilevered steel structure roof was studied by means of numerical simulation where the wind load was a serious concern. The interference effect caused by grandstand on wind field was taken into account in order to obtain reasonable results. A mixed grid model with the O-Grid wall was developed. The multigrid method based on the full implicit coupling scheme of CFX was employed using nonlinear k-ε EARSM turbulence model. The static wind pressure coefficients, the flow field characteristics and the variation of wind pressure of different wind directions were analyzed. The outcomes indicate that the blockade caused by grandstand under windward condition can increase wind suction by nearly one time. Under leeward condition, the impingement and the turbulent diffusion can weaken the total wind load on the upper and lower roof surface. The results were converted into shape coefficients for design, which were in good agreement with the relevant codes. Thus, a reference can be provided in practice.
Keywords:cantilever structure; wind load; numerical simulation; interference effect; CFD; k-ε; EARSM
作者簡介：余志祥，博士，Email:yzxzrq@126.com。
參考文獻(xiàn)
［1］GB50009—2001 建筑結(jié)構(gòu)荷載規(guī)范［S］. 北京：中國建筑工業(yè)出版社，2002.
［2］黃本才. 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，2001.
［3］村上周三. CFD與建筑環(huán)境設(shè)計(jì)［M］. 朱清宇，譯. 北京：中國建筑工業(yè)出版社，2007.
［4］MENTER F R. Two-equation eddy-viscosity turbulence models for engineering applications［J］. AIAA Journal，1994，32(8)：1598-1605.
［5］ANSYS Inc. ANSYS CFX\|solver theory guide［M］. 2009.
［6］王福軍. 計(jì)算流體動(dòng)力學(xué)分析——CFD軟件原理與應(yīng)用［M］. 北京：清華大學(xué)出版社，2004.
［7］PANNEER R，SELVAM. Multigrid methods for computational wind engineering［J］. Journal of Wind Engineering and Industrial Aerodynamics，1997, 952:67-68.
［8］SIMIU E, SCANLAN R H. Wind effects on structures：an introduction to wind engineering［M］. New York：Wiley, 1986.
［9］THOMPSON J F，SONI B K，WEATHERILL N P. Handbook of grid generation［M］. CRC Press LLC，1999.
［10］ERICK H. Wind turbines-fundamentals, technologies, application and economics［M］. New York：Springer,2000.
［11］克萊斯·迪爾比耶，斯文·奧勒·漢森. 結(jié)構(gòu)風(fēng)荷載作用［M］. 薛素鐸，李彥雄，譯. 北京：中國建筑工業(yè)出版社，2006.
- 下載地址
-
