The design of dam structures requires advanced analysis techniques due to the dam body’s complicated interaction with its surroundings. Consequently, most of the time, it is a must to perform response history analysis during the design and assessment of dam structures. The target fundamental vibration period is necessary to generate ground motion histories compatible with the site-specific response spectrum. In this study, an equation was developed to predict the fundamental vibration period of concrete gravity dams based on an extensive database. First, a wide range of parameters to describe gravity dams’ three-dimensional (3D) geometry and their valleys are determined. A total of 19,440 different 3D numerical models with fluid and solid elements were formed, and the fundamental vibration period values were determined to create the necessary database. Then, multiple nonlinear regression analysis was conducted to propose an equation to predict the fundamental vibration period. The proposed equation could be used to accurately estimate the required fundamental vibration period during the preliminary design stage or the implementation of simplified procedures or during the spectrum matching operations.

由于坝体与周围环境的复杂相互作用，大坝结构的设计需要先进的分析技术。因此，在大多数时候，必须在大坝结构的设计和评估过程中进行响应历史分析。目标基本振动周期对于生成与特定地点的响应谱兼容的地震动历史是必要的。在这项研究中，基于广泛的数据库，开发了一个方程来预测混凝土重力坝的基本振动周期。首先，确定描述重力坝的三维（3D）几何形状及其谷的范围广泛的参数。总共形成了19,440个包含流体和固体元素的不同3D数值模型，确定基本振动周期值以创建必要的数据库。然后，进行了多元非线性回归分析，提出了一个预测基本振动周期的方程。拟议的方程可用于在初步设计阶段或简化程序的实施过程中或在频谱匹配操作过程中准确估算所需的基本振动周期。