单元类型和尺寸对拱坝坝体应力和计算精度的影响

Influence of Finite Element-form and Element-size on Arch Dam Stress and Calculation Accuracy

以某拱坝为例,研究了有限单元类型和单元尺寸对拱坝坝体应力和计算精度的影响。计算结果表明:采用形状良好的高阶单元,坝体应力值收敛速度快,对坝体只需划分很少的单元就能得到较高的计算精度;网格尺寸很大程度上决定了计算规模和计算精度,当网格划分到一定程度后,坝体应力与能量百分比误差均基本趋于稳定,不必再细分网格。

Taking an arch dam for example, this study examined the influence of finite element form and element size on the stress of arch dam and calculation accuracy. The results showed that the stress of arch dam converged fastly when adopting good shape and higherorder, the finite element model of arch dam just needed a few elements while higher calculation accuracy can be obtained; The element size had a great impact on calculation scale and calculation accuracy. When the element has its right size, the arch dam stress and energy percentage error are basically stable.