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结合某大型水电站的工程实际,采用ABAQUS程序和其中的混凝土损伤塑性模型,对传统垫层、直埋及局部垫层蜗壳进行了三维非线性有限元计算.计算结果表明,直埋蜗壳外围混凝土损伤范围最大,局部设置垫层可以有效减少钢筋用量,降低钢筋应力,缩小外围混凝土的损伤区.垫层平面铺设范围越大,上述效果越明显,但是导致座环的扭转变形也越大.当垫层平面范围从蜗壳进口端铺设到135°断面时,定子和下机架基础板的相对不均匀上抬量最小,对机组运行有利.
Combined with the engineering practice of a large hydropower station, the ABAQUS program and the plastic damage plastic model are used to calculate the three-dimensional nonlinear finite element of the conventional cushion, direct burial and partial cushion volute. The calculation results show that the outer periphery The concrete damage range is the largest, and the cushion layer can reduce the amount of steel bar effectively, reduce the stress of steel bar and reduce the damage area of the surrounding concrete.What the more obvious the above-mentioned effect is, the larger the flatness of the laying plane is, but the greater the torsional deformation of the seat ring. When the cushion plane is laid from the volute inlet to the 135 ° section, the relative uneven lift of the stator and the lower frame base plate is minimal, which is beneficial to the operation of the unit.