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一、前言传统方法在估算地震荷载作用下填筑坝的特性时尽管用了简化假定,但仍然相当麻烦,因此在考虑地震危害时,这些方法不能用于确定坝体最优尺寸。实际上,传统方法一般用于校核坝体的设计安全。通用的传统方法计算分两步进行: 1.按二维有限元方法计算地震作用下坝体的动力反应。建筑材料用等线性法(equivalent linear method)模拟。 2.用纽马克方法计算地震后大坝产生的永久位移。该方法包括以下步骤:
I. INTRODUCTION Traditional methods, while estimating the characteristics of dam-filled dams under seismic loading, are rather troublesome despite the simplifying assumptions that can not be used to determine the optimal dam size when considering seismic hazards. In fact, the traditional method is generally used to check the design of dam safety. The common traditional method is calculated in two steps: 1. Calculate the dynamic response of the dam under the action of earthquake by means of two-dimensional finite element method. Building materials are modeled using the equivalent linear method. 2. Use Newcastle method to calculate the permanent displacement produced by the dam after the earthquake. The method comprises the following steps: