平均屈服加速度的Newmark滑块位移法

为了合理考虑坡底输入峰值地震动沿滑动体的弹性放大效应对滑动体屈服加速度和累计塑性滑移量的影响,采用蚁群复合形法结合常用的极限平衡分析法搜索潜在滑动体的位置,在Newmark"刚体滑块模型"基础上,采用滑动体的"平均屈服加速度"作为塑性滑移分析的屈服加速度,利用几种常用的刚体极限平衡分析法(LEM)推导诱发坡体失稳"平均屈服加速度"的解析表达式.算例分析表明,基于平均屈服加速度的Newmark滑移分析法的计算效率和计算精度均得以显著改善.

Refined Newmark sliding method based on average yielding acceleration

In order to reasonably consider the effect of flexibility of the input peak ground motion along the sliding body on the critical sliding acceleration and cumulative sliding displacement,the combination of ant colony complex method with limit equilibrium methods is used to search the position of potential sliding body. Based on the principle of the rigid Newmark sliding model,the average yielding acceleration is considered as the critical acceleration during the analysis of sliding displacement.Analytical expressions of the average yielding acceleration are presented based on several common limit equilibrium methods.It is shown that the computational efficiency and accuracy of the refined Newmark sliding method based on the average yielding acceleration have been improved significantly.