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以某核电站安全壳为背景,在原设计方案环向预应力筋和竖向预应力筋正交布置方式(HP-VTPT)与双向交叉螺旋线型预应力筋布置方式基础上,提出倒U型与倒V型预应力筋混合布置方式(IU-IVPT);基于安全壳混凝土的预应力一致原则,推导了由HP-VT-PT布置方式向IU-IV-PT布置方式转换的算式;选用大型通用有限元软件ANSYS,建立有限元实体模型,从顶点竖向位移、筒身径向位移和混凝土应力等方面分析,IU-IV-PT布置方式下安全壳受力性能与HP-VT-PT布置方式下受力性能基本一致,并采用等效荷载法验证了两种预应力筋布置方式是等价的,对其在水平荷载下进行推覆分析,结果表明:安全壳屈服时侧向位移和基底剪力屈服值分别提高64%和28%。
Based on the containment of a nuclear power plant, based on the arrangement of hoop prestressing tendons and vertical prestressing tendons (HP-VTPT) and the arrangement of bidirectional intersecting helical prestressing tendons in the original design scheme, (IU-IVPT). Based on the principle of prestressing consistency of concrete containment, the formula of conversion from HP-VT-PT layout to IU-IV-PT layout is derived. Large-scale universal Finite element software ANSYS is used to establish the finite element model. From the aspects of vertical displacement of the vertex, radial displacement of the cylinder body and concrete stress, the mechanical performance of containment under IU-IV-PT arrangement and the arrangement of HP-VT-PT The results show that the lateral displacements of the containment under the horizontal load and the basement Shear yield value increased by 64% and 28% respectively.