Abstract：In order to determine the wind pressure distribution characteristics of a large-span warpage roof structure, a wind tunnel test and numerical simulation were carried out for a large-span warpage roof. First, the distribution of roof pressure and influence of open doors and windows on the wind pressure distribution were analysed according to the wind tunnel test results. Then, the mean wind pressure distribution for the roof structure was simulated on a CFX software platform by using an RNG k-ε turbulence model, and the simulation results were compared to the wind tunnel test data. The results showed that the open doors and windows yielded little influence on the external wind pressure, and non-negligible influence on the internal pressure. Specifically, when the doors and windows of one side were opened, the roof was subjected to an upward lifting force. Alternatively, when both sides were opened at the same time, the internal pressure resulted in a downward suction on the roof. The RNG k-ε turbulence model was used to simulate the average wind pressure distribution of a large-span warpage roof structure, and was found to accurately reflect the actual wind pressure. The primary effect of wind pressure on the roof was suction, and the most unfavourable position of wind load occurred at the warping edge and in the rooftop area. When the flow direction occurred parallel to the warp direction, the wind flow yielded increased separation on the warp edge and a stronger vortex on the warp surface. Wind flowing around the building resulted in the separation and vortex occurring along both sides in the flow direction; additionally, two large symmetric trailing vortexes were formed on the leeward sides. However, there was no significant evidence of separation and vortex occurring on both sides when the wind flow was directed against warpage.
林拥军, 沈艳忱, 李明水, 罗楠. 大跨翘曲屋盖风压分布的风洞试验与数值模拟[J]. 西南交通大学学报, 2018, 53(2): 226-233.
LIN Yongjun, SHEN Yanchen, LI Mingshui, LUO Nan. Evaluation of Wind Pressure Distribution for Large-Span Warpage Roof via Wind Tunnel Testing and Numerical Simulation. Journal of SouthWest JiaoTong University, 2018, 53(2): 226-233.
楼文娟,孙斌,卢旦,等. 复杂型体悬挑屋盖风荷载风洞试验与数值模拟[J]. 建筑结构学报,2007,28(1):107-112. LOU Wenjuan, SUN Bin, LU Dan, et al. Wind tunnel tests and numerical simulation of wind loads on complex cantilevered roofs[J]. Journal of Building Structures, 2007, 28(1):107-112.
[2]
林拥军,宋长江,罗楠,等. 大跨度单层网壳结构风洞试验研究[J]. 工业建筑,2013,43(7):130-134. LIN Yongjun, SONG Changjiang, LUO Nan, et al. Study on wind tunnel tests of large-span single-layer reticulated shell structure[J]. Industrial Construction, 2013, 43(7):130-134.
[3]
马文勇,刘庆宽,尉耀元. 具有凹面外形的大跨屋盖结构风荷载分布及风洞试验研究[J]. 振动与冲击,2013,31(22):34-38. MA Wenyong, LIU Qingkuan, WEI Yaoyuan. Wind load distribution and wind tunnel tests for a curved concave long-span roof[J]. Journal of Vibration and Shock, 2013, 31(22):34-38.
[4]
罗楠,廖海黎,李明水. 大跨屋盖结构共振响应的简化CQC法[J]. 西南交通大学学报,2012,47(6):915-921. LUO Nan, LIAO Haili, LI Mingshui. Simplified CQC method for resonant response of long-Span roof structure[J]. Journal of Southwest Jiaotong University, 2012, 47(6):915-921.
[5]
黄鹏,蔡玢,全涌,等. 基于实测的低矮房屋屋面风压极值计算方法[J]. 西南交通大学学报,2014,49(2):247-253. HUANG Peng, CAI Bin, QUAN Yong, et al. Peak pressure estimation method of wind loads on low-rise building based on field measurement[J]. Journal of Southwest Jiaotong University, 2014, 49(2):247-253.
[6]
UEMATSU Y, WATANABE K, SASAKI A, et al. Wind induced dynamic response and result ant load estimation of a circular flat roof[J]. Journal of Wind Engineering & Industrial Aerodynamics, 1999, 83:251-261.
[7]
傅继阳,赵若红,徐安,等. 大跨屋盖结构风效应的风洞试验与原型实测研究[J]. 湖南大学学报:自然科学版,2010,37(9):12-18. FU Jiyang, ZHAO Ruohong, XU An, et al. Wind tunnel and full scale study of wind effects on a large roof structure[J]. Journal of Hunan University:Natural Sciences, 2010, 37(9):12-18.
[8]
王振华,袁行飞,董石麟. 大跨度椭球屋盖结构风压分布的风洞试验和数值模拟[J]. 浙江大学学报:工学版,2007,41(9):1462-1466. WANG Zhenhua, YUAN Xingfei, DONG Shilin. Wind tunnel experiment and numerical simulation of wind pressure distribution of long span ellipsoidal shell structure[J]. Journal of Zhejiang University:Engineering Science, 2007, 41(9):1462-1466.
[9]
顾明,赵雅丽,黄强,等. 低层房屋屋面平均风压的风洞试验和数值模拟[J]. 空气动力学学报,2010,28(1):82-87. GU Ming, ZHAO Yali, HUANG Qiang, et al. Wind tunnel tests and numerical simulation of mean wind pressures on roof of low-rise buildings[J]. Acta Aerodynamica Sinica, 2010, 28(1):82-87.
[10]
MURAKAMI S. Current status and future trends in computational wind engineering[J]. Wind Eng.Indus. Aerodyn, 1997, 67/68:3-34
[11]
GLORIA M, MORET R A, PEDRO M. Experimental and numerical study of wind pressures on irregular plan shapes[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2005, 93:741-756.
[12]
KIM S E, FERIT B. Application of CFD to environment flows[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1999, 81:145-158.
[13]
GOSMAN A. Developents in CFD for industrial and environmental applications in wind engineering[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1999(81):21-39
马骏,周岱,李华锋等. 大跨度空间结构抗风分析的数值风洞方法[J]. 工程力学,2007,24(7):77-85. MA Jun, ZHOU Dai, LI Huafeng, et al. Numerical wind tunnel technique for the wind resistance analysis of long span spatial structures[J]. Engineering Mechanics, 2007, 24(7):77-85.
[19]
林郁,卓新. 开敞式叉筒网壳风场数值模拟与受力分析[J]. 浙江大学学报:工学版,2004,38(9):1170-1174. LIN Yu, ZHUO Xin. Numerical simulation and mechanics analysis of wind loading on open latticed groined barrel vault[J]. Journal of Zhejiang University:Engineering Science, 2004, 38(9):1170-1174.
[20]
YAKHOT V, ORSZAG S A, THANGAM S. Development of turbulence models for shear flows by a double expansion technique[J]. Physics of Fluids A, 1991, 4(7):1510-1520.
[21]
SPECIAL C G, THANGAM S. Analysis of an RNG based turbulence model for separated flows[J]. International Journal of Engineering Science, 1992, 10:1379-1388.
[22]
KASPERSKI M, NIEMANN H J. The LRC (load response correlation) method:a general method of estimating unfavorable wind load distributions for linear and nonlinear structural behavior[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1992, 43(3):1753-1763.
