1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China;
2. Zhejiang Provincial Institute of Communications Planning, Design and Research Co., Ltd., Hangzhou 310030, China
In order to obtain the wind loading of butterfly windbreak nets, force balance testing methods in a wind tunnel were employed. The aerodynamic coefficients of the windbreak nets with two opening ratios under different azimuths were obtained. The difference of aerodynamic coefficients between the isolated case and the interference case was analyzed. Then the testing results were compared with those obtained from various countries’ specifications and literatures. Finally, shape coefficients and skewed wind loading distribution factors of butterfly windbreak nets are recommended. Results show that the Reynolds effect of aerodynamic coefficients of windbreak nets is not significant. For the windbreak net with 30% opening ratio, its shape coefficients in the windward direction is larger than that in the leeward direction for the isolated case, whereas the coefficients in the windward direction is smaller than that in the leeward direction for the interference case. This is almost due to the factor that the wind catching effect will be more significant for the interference case. The testing results of the shape coefficients with different opening ratios are very close to those regulated in the AS/NZS specifications. The shape coefficients of the windbreak nets with opening ratios of 30% and 40% are recommended to be 1.06 and 1.10, respectively. And the skewed wind loading distribution factors in the vertical direction are suggested to be the cosine function of the wind azimuth.
Key words: butterfly wind net, shape coefficient, wind tunnel test, opening ratio, skewed wind loading distribution factor
SHEN Guohui1,HAN Kanghui1,LU Jian2,ZHANG Jingjing2.
Shape coefficients and skewed wind loading distribution factors of butterfly windbreak nets[J]. Journal of Vibration and Shock, 2022, 41(14): 99-104
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] GB 50009-2012. 建筑结构荷载规范[S]. 北京: 中国建筑工业出版社, 2012.
Load code for the design of building structures: GB 50009-2012[S]. Beijing: China Architecture and Building Press, 2012.
[2] 蒋小芳, 丁美凤. 防风网结构设计的影响因素[J].水运工程, 2013(10): 177-179.
JIANG Xiaofang, DING Meifeng. Influential factors for architectural design of windproof net[J]. Port & Waterway Engineering, 2013(10): 177-179.
[3] 安桂萍. 风区铁路沿线防风屏障结构静动力分析[D]. 大连: 大连海事大学, 2015.
AN Guiping. Static and dynamic design of wind barrier along the railway in wind area[D]. Dalian: Dalian Maritime University, 2015.
[4] 田栋. 高原地区铁路堆煤场防风网设计研究[J]. 铁道标准设计, 2014, 58(6): 44-49.
TIAN Dong. Design research of meshed windbreak used in railway coal storage yard in plateau region [J]. Railway Standard Design, 2014, 58(6): 44-49.
[5] 张锡治, 张佳玮, 牛四欣, 等. 钢-混凝土组合装配式防风网优化设计[J]. 特种结构, 2017, 34(4): 12-17.
ZHANG Xizhi, ZHANG Jiawei, NIU Sixin, et al. Optimized design of steel-concrete composite fabricated windproof net[J]. Special Structures, 2017, 34(4): 12-17.
[6] 马高峰. 防风网支护结构优化计算与风振分析[D]. 大连: 大连理工大学, 2012.
MA Gaofeng. Optimization and wind-induced vibration analysis of wind fence structure[D]. Dalian: Dalian University of Technology, 2012.
[7] 刘现鹏, 王元战, 洪宁宁, 等. 秦皇岛港煤堆场防风网结构风振响应分析[J]. 港工技术, 2008, 5: 15-17.
LIU Xianpeng, WANG Yuanzhan, HONG Ningning, et al. Response analysis on wind excitation of windbreak structure around coal store yard of qinhuangdao port[J]. Port Engineering Technology, 2008, 5: 15-17.
[8] 段振亚, 黄文博, 傅进. 防风网支撑钢构架结构设计与力学特性分析[J]. 石油化工设备, 2013, 42(4): 27-30.
DUAN Zhenya, HUANG Wenbo, FU Jin. Structure design and mechanical characteristics analysis of steel bracing structure of porous fence[J]. Petro-chemical Equipment 2013, 42(4): 27-30.
[9] 徐洪涛, 李明水, 廖海黎, 等. 防风网风洞试验及其结构设计参数确定[J]. 建筑结构, 2010, 40(5): 104-107.
XU Hongtao, LI Mingshui, LIAO Haili, et al. Wind tunnel test and determination of structure design parameter for windbreak[J]. Building Structure, 2010, 40(5): 104-107.
[10] 周驰. 防风网阻力系数的计算方法研究[D]. 青岛: 青岛科技大学, 2017.
ZHOU Chi. Computational method study on drag coefficient of porous fence[D]. Qingdao: Qingdao University of Science and Technology, 2017.
[11] 张宏杰, 黄阳, 周奇. 圆管输电塔风荷载多天平同步测力风洞试验研究[J]. 振动与冲击, 2019, 38(22): 137-143.
ZHANG Qinghua, HUANG Yang, ZHOU Qi. Wind tunnel tests for wind loads on a tubular transmission tower via multi-balance synchronous force measurement[J]. Journal of Vibration and Shock, 2019, 38(22): 137-143.
[12] 张庆华, 马文勇. 多回路高压输电塔典型横担结构风力系数风洞试验研究[J]. 振动与冲击, 2016, 35(16): 158-163.
ZHANG Qing, MA Wenyong. Experimental study of wind force coefficients on typical crossarms of a multi-circuit high-voltage transmission tower[J]. Journal of Vibration and Shock, 2016, 35(16): 158-163.
[13] 张庆华,顾明,黄鹏.格构式塔架风力特性试验研究[J].振动与冲击,2009,28(02):1-4.
ZHANG Qinghua, GU Ming, Huangpeng. Experimental study of wind force on latticed tower [J]. Journal of Vibration and Shock, 2009,28(02): 1-4.
[14] DL/T 5551-2018架空输电线路荷载规范[S]. 北京: 中国计划出版社, 2018.
DL/T 5551-2018 Load code for the design of overhead transmission line[S]. Beijing: China Planning Press, 2018.
[15] Code of practice on wind effects in Hong Kong[S]. Hong Kong: Building Department of Hong Kong, 2019.
[16] BS6399-2: 1997, Loading for buildings-part 2: code of practice for wind loads. London: British Standard, 1997
[17] EN 1991-1-4: 2005, Eurocode l: Actions on structures - Part 1-4: general actions-wind actions[S]. Brussels: European Committee for Standardization, 2005.
[18] RLB-AIJ: 2004, Recommendations for loads on buildings[S]. Tokyo: Architectural Institute of Japan, 2004.
[19] AS /NZS 1170.2: 2011, Structural design actions Part 2: wind actions[S]. Sydney: Joint Technical Committee, 2011.
[20] ASCE/SEI 7-16, Minimum design loads and associated criteria for buildings and other structures[S]. Virginia: American Society of Civil Engineers, 2017.
[21] 王泽涛. 防风网风速折减效果及风荷载体型系数风洞研究[D]. 大连: 大连理工大学, 2011.
WANG Zetao. The research on wind speed reduction effect and press coefficient of the wind-break net by wind tunnel[D]. Dalian: Dalian University of Technology, 2011.
[22] RICHARDS P J, ROBINSON M. Wind loads on porous structures[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1999, 83(1): 455-465.
[23] DONG Zhibao, MU Qingsong, LUO Wanyin, et al. An analysis of drag force and moment for upright porous wind fences[J]. Journal of Geophysical Research, 2008, 113(D4): 103-110.