ABSTRACT

Offshore platforms in seismically active areas should be properly designed to survive within the face of intense earthquakes without a global structural collapse. This paper scrutinizes the seismic performance of a newly designed and established jacket type offshore platform based on the API-RP2A normalized response spectra during seismic events. A finite element model is developed from a typical jacket type offshore platform taking into the effect of the interaction among structure, pile, and soil components. The seismic responses of jacket type offshore platforms subjected to random earthquake excitations are evaluated by means of the power spectral density (PSD) analysis. Dynamic characteristics, the response function, output PSD and transfer functions for various elements of the platform are discussed. The spectrum compatible PSD is directly used to estimate the peak structural responses and determine the dynamic response of offshore jacket platforms that meet the required level of engineering practice for preliminary design.

摘要

地震活跃地区的海上平台应经过适当设计，以在强烈地震中生存，而不会导致全球结构倒塌。本文基于 API-RP2A 归一化反应谱研究了新设计和建立的导管架式海上平台在地震事件期间的抗震性能。一个有限元模型是从一个典型的导管架式海上平台发展而来的，考虑到结构、桩和土壤成分之间的相互作用的影响。通过功率谱密度（PSD）分析评估了导管架式海上平台在随机地震激发下的地震响应。讨论了平台各个元素的动态特性、响应函数、输出 PSD 和传递函数。