一、前言50年代以来,我国对水电站机墩和蜗壳钢筋混凝土结构多采取沿圆周切取单位宽度,对结构进行动力和静力计算。很明显,蜗壳、机墩和风罩等是一个空间结构,取其中某一结构又进行平面处理,所得结果难以反应实际情 I. Introduction Since the 1950s, China has taken a unit width along the circumference of the piers and volute-reinforced concrete structures of hydropower stations to calculate the structure’s dynamic and static forces. Obviously, the volute, the pier and the wind shield are a kind of spatial structure. If any one of the structures is planarized, the result is difficult to reflect the actual situation