|
|
|
| Wind tunnel tests for wind loads of crank arms of cup-type transmission towers |
| YANG Fengli1, NIU Huawei2, YANG Jingbo1, ZHANG Hongjie1 |
1. China Electric Power Research Institute, Beijing 100192, China;
2. Wind Engineering Research Center, Hunan University, Changsha 410082, China |
|
|
|
Abstract
Cup-type transmission towers are frequently used in 1000kV UHV transmission lines. However, different calculation models are used for wind loads calculation of crank arms in design. Until now there has been no specialized study on wind loads of cranks arms. Wind tunnel tests were conducted on crank arm models of a cup-type transmission tower under 15m/s and 20m/s wind velocities. The drag coefficients along wind direction axis and body-fitted axis for 11 skewed angles were obtained. The models’ shape coefficients over the windward surface and the leeward one, respectively and the leeward surface shielding factor η of the models were obtained. The skewed wind load factors and the effective projected areas (EPA) of the models were analyzed. The parameters determined with the wind tunnel tests for the wind loads calculation of crank arms were compared with standard values in Chinese and foreign codes. Some design suggestions for the wind loads calculation of crank arms of cup-type transmission towers were proposed. It was shown that the wind loads of crank arms calculated according to the tower body model of Chinese code can meet safety requirements, but the total wind loads of crank arms calculated for 90° wind incidence angle are conservative; the wind loads of crank arms calculated according to the cross-arm model of Chinese code are much lower than the wind tunnel test values for 45°, 60° and 90° wind incidence angles, so the wind loads of crank arms are underestimated and there is a safety hazard in anti-wind design of structures.
|
|
Received: 15 June 2016
Published: 15 December 2017
|
|
|
|
[1] DL/T 5154-2012，架空输电线路杆塔结构设计技术规定[S]．北京：中国计划出版社，2012．
DL/T 5154-2012，Technical code for the design of tower and pole structures of overhead transmission lines[S]．Beijing：China Planning Press，2012．(in Chinese)
[2] American Society of Civil Engineers．ASCE manuals and reports on engineering practice No．74[S]．Reston：American Society of Civil Engineers，1991．
[3] American Society of Civil Engineers．ASCE manuals and reports on engineering practice No．74[S]．Reston：American Society of Civil Engineers，2010．
[4] International Electrotechnical Commission．IEC 60826，Design criteria of overhead transmission lines [S]．Geneva：International Electrotechnical Commission，2003．
[5] Japanese Electrotechnical Committee．JEC-127-1979，Design standards on structures for transmissions[S]. Tokyo，JEC，1979．
[6] British Standards Institution．BS-8100：1986，Lattice tower and masts-Part1：Code of practice for loading [S]．London：British Standards Institution，2005．
[7] 吕付玉，刘宏滨．道亨铁塔满应力分析软件与自立式铁塔内力分析软件的对比分析[J]. 广东电力，2011，24(6)：31-34．
Lyu Fuyu，Liu Hongbin．Comparative Analysis of Daoheng MYL Software and TTA Software[J]．Guangdong Electric Power，2011，24(6)：31-34．(in Chinese)
[8] Bayar，D.C.．Drag coefficients of latticed towers [J]. Journal of Structural Engineering，1986，112：417-430．
[9] 邹良浩，梁枢果，邹垚，等．格构式塔架风载体型系数的风洞试验研究[J]. 特种结构，2008，25(5)：41-43．
Zou Lianghao，Liang Shuguo，Zou Yao，et al．Wind tunnel test on wind load shape coefficients of lattice towers[J]．Special Structures，2008，25(5)： 41-43．(in Chinese)
[10] 张庆华，顾明，黄鹏．典型输电塔塔头风力特性试验研究[J]. 振动工程学报，2008，21(5)：452-457．
Zhang Qinghua，Gu Ming，Huang Peng．Experiment on wind force on typical superstructures of latticed transmission tower[J]．Journal of Vibration Engineering，2008，21(5)：452-457．(in Chinese)
[11] 邓洪洲，张建明，帅群，等．输电钢管塔体型系数风洞试验研究[J]. 电网技术，2010，34(9)：190-194．
Deng Hongzhou，Zhang Jianming，Shuai Qun，et al．Wind-tunnel investigation on pressure coefficient of steel tubular transmission tower[J]．Power System Technology，2010，34(9)：190-194．(in Chinese)
[12] T.G. Mara，T.C.E. Ho．Design loads for transmission towers under skewed wind loading[C]. Structures Congress 2011，Las Vegas，American Society of Civil Engineers (ASCE)，2001：1246-1257．
[13] Fengli Yang，JingboYang，Huawei Niu，et al．Design wind loads for tubular-angle steel cross-arms of transmission towers under skewed wind loading. Journal of Wind Engineering and Industrial Aerodynamics，2015，140，10-18．
|
|
|
|
