在役大型水工弧形闸门结构静强度与模态分析

Structural Strength and Modal Analysis of Large Hydraulic Radial Gates in Service

为保证在役大型弧形闸门安全稳定运行,以葛洲坝工程水工弧形闸门为例,利用有限元分析软件,按设计水头对其进行静力学强度和模态分析,得出闸门最大应力集中点及变形情况,并根据自振频率、振型和最大变形位移判断闸门振动强弱。结果表明,闸门设计总水压力与理论计算偏差为4.7%,在5.0%误差控制范围内,弧形闸门整体最大应力为373.86 MPa、变形为12.938 mm,强度和刚度均能满足现行规范设计要求,面板底部存在局部应力集中,闸门整体振动变形量小于0.508 mm,振动强度不大,只有低阶频率出现在水流脉动压力的高能区,其发生共振的可能性小。

To ensure the safe and stable operation of large radial gate in service, taking the hydraulic radial gate of Gezhouba Project as an example, the finite element analysis software was used to analyze the static strength and modal to obtain the maximum stress concentration point and deformation of the gate under the design head condition. The vibration intensity of the gate was judged according to the natural frequency, vibration model and maximum deformation displacement. The results show that the deviation between the total design water pressure of the gate and the theoretical calculation is 4.7%, which is located in the 5% error control range. The overall maximum stress of the radial gate is 373.86 MPa and the deformation is 12.938 mm, meeting the design requirements of the specification. The bottom of the panel exists local stress concentration, the overall vibration deformation of the gate is less than 0.508 mm, and the vibration intensity is small. Only low-order frequencies appear in the high-energy region of the pulsating pressure of the water flow, and the possibility of resonance is small.