潜孔式弧门不同开度泄流时支臂稳定性分析

Analysis on Submerged Radial Gate Bracket Stability at Different Discharge Openings

潜孔式弧形闸门在局部开启泄流时存在因支臂失稳而影响闸门安全的情况,结合工程实例,基于结构稳定性分析原理,采用ANSYS Workbench中Static Structural+Eigenvalue Buckling的结构屈曲分析技术,对闸门支臂进行不同开度工况下特征值屈曲分析,并针对临界屈曲荷载最小工况进行支臂非线性屈曲分析。结果表明,各开度下支臂各阶特征值失稳模态接近一致,各阶临界屈曲荷载随开度增大均呈现先减小后增大的趋势。在开度为0.05时,各阶特征值临界屈曲荷载最小,此工况下支臂非线性临界屈曲荷载更小,稳定承载能力更弱。实际设计中可对斜撑杆进行加强以提高支臂稳定性,实际运行中需尽量避免闸门在此开度工况下停留以防止发生失稳。

When the submerged radial gate is partially opened for water discharge,the gate safety may be affected by the instability of gate brackets.Combined with an actual engineering practice,the eigenvalue buckling analysis on gate brackets in various operating conditions and the nonlinear buckling analysis of brackets at minimum critical buckling loads are carried out on the basis of structural stability analytic principal.These analyses are implemented with the Static Structural+Eigenvalue Buckling of ANSYS Workbench.The results show that the buckling modes of eigenvalues in different openings tend to be uniform,and the critical buckling load demonstrates the character of decrease first and then increase with the increase of the opening.When the opening is 0.05,the critical buckling loads become the smallest,and under this condition,the nonlinear critical buckling load of brackets is more smaller,and the stable bearing capacities is more weaker.In the actual design,the sway rods can be reinforced to improve the stability of brackets,and in actual operation,it is necessary to avoid the gate staying in this opening condition to prevent instability.