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针对弧形闸门安全评价中采用的闸门单体计算模型过于简化的问题,本文应用结构有限元通用软件ANSYS,对比分析了惯用的闸门单体结构分析模型与考虑止水摩阻及支铰和牛腿间直接作用的闸坝一体化模型在关闭和瞬开两种主要状态下的静动力特性。以考虑周边止水摩阻影响的闸坝一体化模型为准,以某水电站弧形闸门分析为例,在静力分析方面,在关闭时单体模型下框架主梁的最大位移及等效应力分别偏大108.5%和67.1%,支臂内力偏大52.8%,单体模型下框架极不经济;在瞬开时单体模型上框架主梁的位移及等效应力偏差分别为-10.1%和-21.2%,支臂内力偏小8.1%,单体模型上框架极不安全。在动力分析方面,止水及流固耦合作用使闸坝一体化模型的弧门前十阶频率最大下降48%,从而远离流激振动的主频区,利于弧门的动力稳定。结果表明:目前采用的单体模型及校核水位关闭工况的闸门结构分析的安全性及经济性均难以保证,合理的弧形闸门结构安全评价模型应按闸坝一体化结构建立有限元模型,并且考虑周边止水对结构静动力特性的影响,而且此模型的校核水位瞬开状态是控制工况,采用此模型及工况才能确保结构有限元分析成果的正确性,实现闸门结构分析安全性与经济性的统一。
In view of the simplification of calculation model of single gate in the safety assessment of arc gate, this paper uses structural finite element general software ANSYS to compare and analyze the common gate single structure analysis model and consider the water stop friction, branch hinges and cow legs The direct-acting sluice-dam integration model has both static and dynamic characteristics in two main states: closed and open. Taking the integration of sluice dam considering the effect of peripheral water-stop frictional resistance as an example, taking the analysis of the radial gate of a hydropower station as an example, in the static analysis, the maximum displacement and equivalent stress Which are 108.5% and 67.1% respectively, and the internal force of the arm is 52.8% larger. The frame under the single model is extremely uneconomical. The displacement and equivalent stress deviation of the main beam on the single model are -10.1% and -21.2%, arm internal force is small 8.1%, the single model of the framework is very unsafe. In dynamic analysis, the effect of water-stop and fluid-structure coupling reduces the ten-order frequency of the front of the arc-gate in the integrated dam system by 48%, and thus far away from the main frequency region of the flow vibration, which is in favor of the dynamic stability of the arc gate. The results show that the current single-unit model and the gate structure analysis for checking the closed water level are difficult to guarantee. The reasonable safety evaluation model of the radial gate should be based on the integrated structure of the sluice dam to establish the finite element model , And considering the impact of surrounding water on the static and dynamic properties of the structure, and the instantaneous state of check water level of this model is the control condition, the correctness of the finite element analysis results can be ensured by using this model and working conditions to achieve the gate structure analysis Security and economic unity.