关键词: 变电构架, 格构式结构, 风荷载, 标准对比

Abstract: To improve the internationalization level of China’s substation structural design, a comparison is made on the differences of the wind loads and wind induced responses of the oversea substation latticed gantries calculated by four different design codes, including ASCE 113, BS EN50341-1, IEC60826 and GB 50009. The factors that lead to the differences between these codes are found and the impacts of wind loads of different codes on the gantry design of different voltage levels are analyzed. The wind load formulas in the above-mentioned four codes are all converted into an unified form so that all factors in the formulas can be compared respectively. It is found that the load factor is the crucial factor that leads to the wind load calculated by GB higher than that calculated by other codes. The substation latticed gantries of four different voltage levels are modeled, and the wind loads and wind induced responses calculated by these four codes are compared. The results show that, under the return period of 50 years, the deformation values of the gantry column calculated according to the standard wind load are basically the same between GB and the other codes. However, the forces of the gantry legs calculated according to the design wind load are different between GB and the other codes with the former about 1.14 to 1.37 times higher than the latter, and the difference increases with the increase of the gantry height and voltage levels.

Key words: substation gantry, latticed structure, wind load, code comparison