水电站充水保压蜗壳初始保压间隙的构造方法

A New Numerical Simulation Method of Initial Gap between Steel and Concrete after Pressure Relief in Spiral Cases Embedded under Pressurized Conditions

充水保压蜗壳初始保压间隙的高效模拟是仿真算法的难点之一,为弥补传统仿真算法的不足,以ABAQUS为平台,开展数值模拟试验,提出在蜗壳与外围混凝土传力面上设置铰接-接触单元,并结合单元生死技术的初始保压间隙构造方法;之后以国内某大型水电站蜗壳结构为例,分别采用传统仿真算法和新算法模拟了蜗壳打压、卸压过程中典型断面保压间隙的过程。结果表明,新算法所得初始间隙的空间分布规律与传统算法完全一致,且新算法可一次完成、原理简单、易于掌握,尤其对于三维计算效率更高,可进行推广应用。

The initial gap between steel and concrete after pressure relief in spiral cases embedded under pressurized conditions has been focused for its difficulty in numerical simulation.A new method that used both hinge-type connect element and contact element based on the element birth and death module of ABAQUS was proposed in this paper.A complete simulation of the construction-to-operation process of a large spiral case structure inland was carried out by using the above method and the traditional simulation method.The results show that the spatial distribution of initial gap calculated by the proposed method is exactly consistent with that calculated by the traditional method.The new method can be finished more simple and efficient,especially suitable for 3-D finite-element numerical simulation.So,it is recommended for spreading and application.