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现行《工业与民用建筑抗震设计规范》(以下简称《抗震规范》)规定,当按底部剪力法计算单层不等高厂房的地震荷载及内力时,高低跨交接处以上柱截面的内力,需乘以修正系数η。笔者认为,这种修正仅是针对屋盖与柱子为铰接连接的排架结构,而不适用于单层厂房中的刚架、门架和框-排架结构体系。
The current “Code for Seismic Design of Industrial and Civil Buildings” (hereinafter referred to as the “Seismic Code”) stipulates that when the seismic load and internal force of a single-storey unequal height building are calculated according to the bottom shear method, the internal forces of the column section above the crossover point are Multiply by the correction factor η. The author believes that this amendment is only for the bent structure with hinged connection between the roof and the column, but it is not applicable to the rigid frame, gantry and frame-and-framing structure system in a single-storey factory building.