Wind loads and wind-induced responses comparison of typical lattice structures based on various codes
The guidelines and procedures about wind load of transmission tower in IEC60826; BS EN 50341; ASCE No.74 and GB50545 are introduced and compared in detail. And taking a typical 500kV single-circuit transmission tower as an example, the difference of wind loads acting on the transmission tower based on various codes are compared with the results tested in the wind tunnel using high-frequency-force-balance technique. Then, the wind-induced responses of the typical transmission tower based on codes and wind tunnel test are computed and analyzed. The results show that the wind loads based on different codes for same transmission tower have some different under the same calculating conditions. With the increasing of section height of the transmission tower, the equivalent static wind loads (ESWLs) based on GB50545 are larger than other codes. The response of typical 500kV transmission tower based on wind tunnel test is similar to the codes. In addition, because GB50545 fails to consider the influence of different return periods, GB50545 could induce unsafe situation with the increased of security levels of transmission lines.
1. North China University of Water Resources and Electric Power, Zhengzhou 450011, China；
2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
The guidelines and procedures about wind load of transmission tower in IEC60826; BS EN 50341; ASCE No.74 and GB50545 are introduced and compared in detail. And taking a typical 500kV single-circuit transmission tower as an example, the difference of wind loads acting on the transmission tower based on various codes are compared with the results tested in the wind tunnel using high-frequency-force-balance technique. Then, the wind-induced responses of the typical transmission tower based on codes and wind tunnel test are computed and analyzed. The results show that the wind loads based on different codes for same transmission tower have some different under the same calculating conditions. With the increasing of section height of the transmission tower, the equivalent static wind loads (ESWLs) based on GB50545 are larger than other codes. The response of typical 500kV transmission tower based on wind tunnel test is similar to the codes. In addition, because GB50545 fails to consider the influence of different return periods, GB50545 could induce unsafe situation with the increased of security levels of transmission lines.
张庆华1,2，顾 明2. 典型格构式结构风荷载及风致响应规范比较[J]. 振动与冲击, 2015, 34(6): 140-145.
ZHANG Qing-hua 1,2，GU Ming 2. Wind loads and wind-induced responses comparison of typical lattice structures based on various codes. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(6): 140-145.
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