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长江三峡水电站厂房的屋盖结构采用起坡式正放四角维网架，对三种方案（梁柱式、封闭式和混合式）结构形式的刚度和强度进行了三维有限元计算，并初步计算了厂房上部结构的自振频率及动应力分析，通过比较分析封闭的自振频率及动应力分析，封闭式略优，但三种方案的差别很小，吊车所在墙或柱的高程上，水平变位均小于10mm，满足规范要求．
Three-dimensional finite element method is used to calculate the stiffness and strength of the three schemes (beam-column, enclosed and hybrid) structures of the roof structure of the Three Gorges Project. The natural frequency and dynamic stress analysis of the superstructure of the plant were analyzed. The closed natural frequency and dynamic stress analysis were compared and analyzed, but the difference between the three schemes was very small. The elevation of the wall or column where the crane was located was Displacement is less than 10mm, to meet the regulatory requirements.