Tests for effects of terrain roughness on wind load characteristics of a high-rise building under downburst
WANG Zhisong1,2,JIANG Peng1, WU Yanjun1, LIU Xinglong1, DONG Zhichao1
1.School of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education, Chongqing University, Chongqing 400045, China
The terrain roughness has a great influence on the wind field in the near surface layer. To investigate the variation law of wind pressure on the surface of high-rise building with different roughness topography in wind field of the downburst. Based on impinging jet test, the surface pressure characteristics of high-rise building are discussed in different surface roughness and radial distance. The results indicate that the height of the maximum mean surface pressure on the windward side of the building rises gradually with the roughness increasable, and the positive wind pressure coefficient also increases on the windward side. The absolute value of negative pressure decreases on the leeward side with the roughness raising. The side pressure coefficient is not obvious affected by roughness. The fluctuating pressure coefficient on the side of building increases with terrain roughness raising. The fluctuating wind pressure coefficients of windward and leeward surfaces are less affected by roughness. With the radial distance and the terrain roughness increasable, the outflow intensity reductional is obviously increasing. The wind pressure coefficient are greatly reducible in the middle and lower parts on the windward side. The pressure coefficient decreases gradually on the leeward and the side, and leeward is the linear decreasing trend.
汪之松1,2，江鹏1，武彦君1，刘兴龙1，董志超1. 地表粗糙度对高层建筑下击暴流风荷载特性影响的试验研究[J]. 振动与冲击, 2019, 38(9): 184-191.
WANG Zhisong1,2,JIANG Peng1, WU Yanjun1, LIU Xinglong1, DONG Zhichao1. Tests for effects of terrain roughness on wind load characteristics of a high-rise building under downburst. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(9): 184-191.
[1] Letchford C W, Mans C M, Chay M T. Thunderstorms-their importance in wind engineering (a case for the next generation wind tunnel) [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2002, 90(12/15): 1415-1433.
[2] Holmes J D. Modeling of extreme thunderstorm winds for wind loading of structures and risk assessment[C]. Proceedings of 10th International Conference on Wind Engineering, Copenhagen, Denmark, 1999, 1409-1415.
[3] Letchford C W, Illidge G. Turbulence and topographic effects in simulated thunderstorm downdrafts by wind tunnel jet[C]. Proceedings of the Tenth International Conference on Wind Engineering, Denmark, 1999, 1907-1912.
[4] Wood G S, Kwork K C S, Physical and numerical modeling of thunderstorm downbursts[C]. Proceedings of the Tenth International Conference on Wind Engineering, Denmark, 1999, 1919-1924.
[5] Sengupta A, Sarkar P P. Experimental measurement and numerical simulation of an impinging jet with application to thunderstorm microburst winds [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(3): 345-365.
[6] Mason M S, Wood G S, Fletcher D F. Impinging jet simulation of stationary downburst flow over topography [J]. Wind and Structures,2007,10(5): 437-462
[7] Mason M S, Wood G S , Fletcher D F. Influence of tilt and surface roughness on the outflow wind field of an impinging jet [J]. Wind and Structures, 2009, 12(3): 179-204.
[8] Mason M S, Wood G S, Fletcher DF. Numerical simulation of downburst winds [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2009, 97(11/12): 523-539.
[9] Mason M S, Wood G S, Fletcher D F. Numerical investigation of the influence of topography on simulated downburst wind fields [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2010, 98 (1):21-33.
[10] Sengupta A, Sarkar P P. Experimental measurement and numerical simulation of an impinging jet with application to thunderstorm microburst winds [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(3): 345-365.
[11] 李春祥，刘晨哲，申建红，等．土木工程下击暴流风速数值模拟的研究[J]．振动与冲击，2010，9( 12) : 49-54．
LI Chun-xiang，LIU Chen-zhe，SHEN Jian-hong，et al．Numerical simulations of downburst wind speeds in civil engineering[J]．Journal of Vibration and Shock，2010，29( 12) : 49-54．
[12] 邹鑫，汪之松，李正良.稳态雷暴冲击风风速剖面模型研究[J].振动与冲击，2016,35(15):74-79．
ZOU Xin, WANG Zhi-song, LI Zheng-liang. Study on
the wind profile model of steady-state thunderstorm [J]. Journal of Vibration and shock,2016,35(15):74-79．
[13] Sengupta A, Sarkar P P, Rajagopalan G. Numerical and physical simulation of thunderstorm downdraft winds and their effects on buildings[C]. Proceedings of the First American Conference in Wind Engineering, Clemson, SC, 2001, 4-6.
[14] Chay M T, Letchford C W. Pressure distributions on a cube in a simulated thunderstorm downburst-Part a: stationary downburst observations [J]. Journal of Wind Engineering and Industrial Aerodynamics，2002，90(7): 711-732.
[15] Lin W E, Savory E. Large-scale quasi-steady modelling of a downburst out in flow using a slot jet[J]. Wind and Structures, 2006, 9(6): 419–440.
[16] 赵杨，曹曙阳，Tamura Y，等. 雷暴冲击风模拟及其荷载的风洞试验研究[J]. 振动与冲击, 2009, 28(4): 1-3.
ZHAO Yang, CAO Shu-yang, Tamura Y, et al. Simulat-
ion of downburst and its loads with wind tunnel test [J]. Journal of Vibration and Shock,2009, 28(4): 1-3.
[17] 邹鑫，汪之松，李正良.稳态冲击风作用下高层建筑风荷载特性试验研究[J].湖南大学学报：自然科学版，2016,43(1):29-36.
ZOU Xin, WANG Zhi-song, LI Zheng-liang. Experim-
ental Study on the Wind Load Characteristics of High-rise Building in Stationary Downbursts[J].Journal of Hunan University: Natural Sciences. 2016, 43(1):29-
36.
[18] 李宏海.下击暴流时空分布统计与风场特性和结构风荷载实验研究[D].深圳：哈尔滨工业大学深圳研究生院,2015.
LI Hong-hai. Spatio-temporal Distribution Statistical Analysis and Experiments of Wind Field Characteristics and Wind Loads on Structures of Downburst [D].Shenzhen: Shenzhen Graduate School of Harbin Institute of Technology, 2015
[19] Lettau H. Note on Aerodynamic Roughness-Parameter Estimation on the Basis of Roughness-Element Description [J]. Appl. Meteorol. 1969, 8:828-832.
[20] Wood G S, Kwork K C S, Motteram A N. Physical and numerical modeling of thunderstorm downbursts[J]. Journal of Wind Engineering & Industrial Aerodynamics.2001, 535-552.
[21] 吉柏锋，瞿伟廉. 下击暴流作用下高层建筑物表面风压分布特性[J].华中科技大学学报：自然科学版，2012,40(9):89-94.
JI Bai-feng, QU Wei-lian. Mean wind pressure distribution characteristics on tall building under downburst[J]. Journal of Hunan University: Natural Sciences. 2012,40(9):89-94.
