基于有限元方法的洞坪拱坝体形优化研究

Research on Profile Optimization of Dongping Arch Dam Based on FEM

在初步设计体形的基础上,建立以坝体混凝土方量最小为目标函数,以坝体几何形状限制和坝体拉、压应力满足有限元等效应力控制指标为约束条件的拱坝优化数学模型,运用大型有限元软件ANSYS对洞坪拱坝进行体形优化研究。计算表明,该方法求解效率高,结果的收敛性稳定,优化后的体形更扁平美观,坝体应力更趋于均匀。

Based on the initial dam profile in preliminary design, the profile optimization model of Dongping arch dam is set up with the objective function: the concrete quantity of dam will be minimum, and the constraint conditions: the geometric figure of dam should meet the outline of arch structure and the dam stresses should meet the control indeces of FEM equivalent stre-ses, the optimization model is calculated by FEM software ANSYS which has high efficiency and steady convergency, the optimized dam profile is more artistic to look at and the dam stresses are well-distributed.