Design of Offshore Steel Platforms for Earthquakes and Waves

该项目旨在开发地震和波浪激励下海上钢平台分析和设计的反应谱技术。与传统结构不同，海上结构被水包围；结构与水之间的相互作用产生了附加质量和水动力阻尼。此外，由于存在与地震或波浪作用相关的惯性和阻力的相对量级，因此研究了响应谱受到影响的方式。对于地震荷载，非线性阻力项对结构响应的重要性在整个结构特性范围内进行了研究。对于波浪荷载，采用窄基波浪模型作为第一近似。该研究将为基于响应谱概念的海上结构设计提供一个合理的框架。

The project is formulated to develop response spectrum techniques for analysis and design of offshore steel platforms subjected to earthquake and wave excitations. Unlike conventional structures, offshore structures are surrounded by water; the interaction between the structure and water gives rise to added mass and hydrodynamic damping. Furthermore, because of the existence of the relative magnitude of inertia and drag forces associated with either earthquakes or wave actions, the manner in which the response spectra are affected is investigated. For earthquake loading, the importance of a nonlinear drag term on structural response for an entire range of structural characteristics is examined. For wave loading, a narrow-based wave model is used as a first approximation. The study will lead to a rational framework for the design of offshore structures based on the concept of a response spectrum.