落地式拱形體育場看臺挑篷結(jié)構(gòu)CFD分析
毋英俊1, 陳志華1,閆翔宇1,劉正先2
- 摘 要
-
落地式拱形體育場看臺挑篷結(jié)構(gòu)CFD分析毋英俊1, 陳志華1,閆翔宇1,劉正先2(1 天津大學(xué)建筑工程學(xué)院, 天津 300072; 2 天津大學(xué)機械工程學(xué)院, 天津 300072)[摘要]以某后端開口的落地式拱形體育場看臺挑篷為背景,采用計算流體力學(xué)(CFD)軟件Fluent得到該結(jié)構(gòu)的風(fēng)壓力、風(fēng)壓系數(shù)分布以及結(jié)構(gòu)附近的流場分布。對風(fēng)壓和流場分布進行了詳細的描述和討論,發(fā)現(xiàn)這種挑篷形式與一般懸挑式體育場看臺挑篷類似,最不利工況為風(fēng)從前緣正面吹來對屋蓋造成的強大上吸力。在實際設(shè)計中挑篷體型系數(shù)可分別取為-2.5,1.0進行風(fēng)吸和風(fēng)壓工況的驗算。當(dāng)風(fēng)從看臺屋蓋后側(cè)吹來時會在臨近看臺的跑道和比賽場地上形成湍流,可能會對競技活動的進行造成不良影響,應(yīng)該格外引起注意。[關(guān)鍵詞]體育場看臺挑篷;計算流體力學(xué);風(fēng)壓系數(shù);體型系數(shù)中圖分類號:TU312.1,TU391.4文獻標(biāo)識碼:A文章編號:1002-848X(2011)01-0126-05CFD numerical simulation research on palaestra stand arch roof linked with groundWu Yingjun1, Chen Zhihua1, Yan Xiangyu1, Liu Zhengxian2(1 School of Civil Engineering, Tianjin University, Tianjin 300072, China;2 School of Mechanical Engineering, Tianjin University, Tianjin 300072, China)Abstract:The distribution of wind pressure and wind-pressure coefficient on an arch roof covering the stand of a palaestra was studied by applying the CFD software Fluent. The fluid field condition around the roof was also studied. The arch roof has a gap at its back and links with ground. It shows that the most unfavorable load case is the arch roof suffering wind load in its front face under which the roof suffers a powerful upward load, and the phenomenon is similar with the traditional cantilever roof. Shape coefficient of the roof structure can be -2.5 and 1.0 respectively in order to simulate the upward and downward wind loads. Turbulence happens in the raceway and the field, which may make harmful effect to the gymkhana when wind load applies on the roof in the backward direction.Keywords:palaestra stand arch roof; CFD; wind-pressure coefficient; shape coefficient作者簡介:毋英俊,博士研究生,Email:wuyingjun_tju@yahoo.com.cn。參考文獻[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,2001.[2]MELBOURNE W H, GHEUNG J C K. Reducing the wind loading on large cantilevered roofs[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1988, 28(1-3): 401-410.[3]BARNARD R H. Predicting dynamic wind loading on cantilevered canopy roof structures[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2000,85(1):47-57.[4]顧明, 朱川海. 體育場主看臺弧形挑篷氣彈模型風(fēng)洞試驗和響應(yīng)特性[J]. 土木工程學(xué)報,2006,39(10): 54-59.[5]顧明, 黃翔. 體育場屋蓋氣彈模型設(shè)計及風(fēng)洞試驗研究[J]. 建筑結(jié)構(gòu)學(xué)報,2005,26(1): 60-64.[6]李宏男, 伊廷華. 某體育場看臺挑篷風(fēng)荷載特性及干擾效應(yīng)風(fēng)洞試驗研究[J]. 建筑結(jié)構(gòu),2009,39(7):90-93.[7]MERONEY R N. Comparison of numerical and wind tunnel simulation of wind loads on smooth, rough and dual domes immersed in a boundary layer [J]. Wind and Structures, 2002, 5 (2-4):347-358.[8]林斌, 孫曉穎, 武岳. 大慶石油學(xué)院體育館屋面風(fēng)荷載的風(fēng)洞試驗及CFD數(shù)值模擬[J]. 沈陽建筑大學(xué)學(xué)報:自然科學(xué)版,2006,22(3):357-361.[9]孫曉穎, 武岳, 沈世釗. 平屋蓋風(fēng)壓分布的數(shù)值模擬[J]. 計算力學(xué)學(xué)報,2007,24(3):294-300.[10]王彬, 楊慶山. CFD軟件及其在建筑風(fēng)工程中的應(yīng)用[J]. 工業(yè)建筑,2008,38(增刊):328-332.[11]陳水福, 張學(xué)安, 金建明. 體育場主看臺懸挑屋蓋表面風(fēng)壓的數(shù)值模擬[J]. 工程力學(xué),2007,24(6): 98-103.[12]陳志華, 閆翔宇, 王小盾. 新型斜拉橋與摩天輪復(fù)合結(jié)構(gòu)流場數(shù)值模擬與風(fēng)洞試驗研究[J]. 工程力學(xué),2008,25(8):117-123.[13]金新陽, 楊易, 盛平,等. 新廣州火車站大跨屋蓋結(jié)構(gòu)風(fēng)荷載風(fēng)洞試驗與數(shù)值模擬研究[J]. 建筑結(jié)構(gòu),2009,39(12):55-58.[14]侯愛波, 周錫元. 廈門市高層建筑群風(fēng)場的數(shù)值風(fēng)洞模擬分析[J]. 建筑結(jié)構(gòu),2008,38(8):118-119,126.[15]黃本才. 結(jié)構(gòu)抗風(fēng)分析原理及應(yīng)用[M]. 2版.上海:同濟大學(xué)出版社,2008.