基于COMSOL计算下秦淮河道水闸加固墩结构体型设计分析研究

Analysis and Research on the Design of Sluice Reinforced Pier Structure of Qinhuai River based on COMSOL Calculation

为获得秦淮河洪蓝水闸加固结构设计方案最优化,以钢结构作为闸墩加固方案,利用COMSOL有限元建模计算手段,获得了闸墩拉应力最大位于钢结构加固点部位。加固点与墩底部位拉应力最低方案均为加固数量4根时,加固数量低于4根时墩顶最大拉应力稳定在0.67 MPa,加固数量超过4根后拉应力递增。闸墩加固数量愈多,加固点、墩底部位最大压应力愈大,但在加固数量4根后增幅减小,各加固数量方案中墩顶最大压应力稳定在7.6 MPa。关键部位拉应力降幅变化差异性显著,加固点、墩底、墩顶处最大拉应力在闸墩厚度0.4~1 m平均降幅为21.3%、27.5%、38.8%,在1~1.4 m平均降幅为3.9%、2%、1.3%;厚度1 m时关键部位压应力最大,抗倾覆滑移效果最好,且压应力与厚度参数具有二次函数关系。当闸墩加固数量4根、闸墩厚度1 m时为最优方案。这为水工设计方案最优化比选分析提供一定参考。

In order to analyze the optimal design of the reinforcement structure of the Honglan Sluice on the Qinhuai River,the steel structure is applied as the reinforcement scheme of the sluice pier and the COMSOL finite element modeling calculation method is applied to obtain the maximum tensile stress of the sluice pier at the reinforcement point of the steel structure.The minimum tensile stress between the reinforcement point and the bottom of the pier is 4.When the number of reinforcement is less than 4,the maximum tensile stress on the top of the pier is stable at 0.67 MPa.When the number of reinforcement exceeds 4,the maximum tensile stress increases.The greater the number of pier reinforcement,the greater the maximum compressive stress at the reinforcement point and the bottom of the pier,but the increase decreases after the number of reinforcements is 4,and the maximum compressive stress at the top of the pier is stable at 7.6 MPa.The variation of tensile stress drop in key parts is significant.The decreases of the maximum tensile stress at the reinforcement point,pier bottom and pier top are 21.3%,27.5% and 38.8% on average when the thickness is 0.4~1 m,and 3.9%,2% and 1.3% on average when the thickness is 1~1.4m.When the thickness is 1 m,the compressive stress of the key position is the largest,and the anti-overturning slip effect is the best and the compressive stress has a quadratic function relationship with the thickness parameters.When the number of pier reinforcement is 4 and the thickness of pier is 1 m,it is the optimal scheme.This provides some reference for the optimization comparison analysis of hydraulic design scheme.