划子口河闸弧形钢闸门三维有限元分析与安全评估

Three dimensional finite element analysis and reliability of radial steel gate for Huazikou River sluice

划子口河闸拆建工程闸门为"Π"型弧形钢闸门,为掌握不同工况下的结构变形和应力分布,需要建立三维有限元整体模型进行分析.采用ANSYS有限元计算软件建立模型,按不同工况分别施加荷载.计算结果表明,5种工况下弧形钢闸门的结构变形都在允许范围内,应力值都在钢材的屈服应力以下.采用结构线性屈曲分析闸门结构稳定性,用有限元法求出结构的稳定安全系数,结果表明大部分工况下的稳定安全系数大于4,最先失稳的部位在跨中水平次梁处,建议适当加密跨中纵梁,以减小水平次梁计算长度,提高稳定性.

Large size ＂∏＂ radial steel gate is applied for Huazikou River sluice. It is necessary to establish a finite element analysis model to analyze structure deformation and stress distribution under different working conditions. Taking ANSYS finite element analysis software as a simulation platform, a finite element integrated model is established, and loadings of different working conditions are applied respectively. The calculated results show that structure deformations with five working conditions are smaller than those allowed by speeifications, and stress values are smaller than yield stress of steel. Linear buckling analysis is made on the structural stability of the steel gate, and the safety coefficient is obtained by finite element method. The safety coefficients of the most of the working conditions are larger than 4, and the instability of the horizontal beams appears first at the middle span. To improve the stability of the horizontal beams at the middle span, it is proposed that additional longitudinal beams should be added to reduce the length of the secondary beam.