重力式海洋平台地震反应分析

本文对重力式海洋平台在地震扰动下的动力反应进行了试验研究和理论研究,主要工作如下; 1.对1:50的重力式平台模型在地震模拟振动台上进行了无水和有水两种情形下的对比试验,测定了模型的自振频率、振型阻尼比和地震反应。2.对重力式海洋平台进行了地震反应分析。所选择的计算模式考虑了地基-结构间的相互作用,并考虑了由于甲板质量存在偏心而引起的扭转效应。用附加质量和附加阻尼的方法考虑了流体-结构间的相互作用。3.用Fortran语言编制了计算机程序,并对所模拟的原型进行了参数研究,得到了原型在地震扰动下的动力反应,可供平台设计人员参考。

A Seismic Analysis of Offshore Gravity Platform

Gravity platform is one of the types of oil-drilling platform in offshore engineering, and to study its aseismic behavior is of important significance. This paper includes the following parts: 1. Shaking table test on a model of an offshore gravity platform which is 70 meters in height and 75 meters in base diameter (scale 1:50). 2. Development of a mathematical model and the computer program for the earthquake response analysis of gravity offshore platforms, based on shaking table test. 3. Using the computer program to analyse the earthquake response of the prototype gravity platform. It is found that the calculated results are in good agreement with those of shaking table test. Both the calculated results and test results show that the torsion effect due to the eccentricity of deck mass can not be neglected for the design of offshore gravity platforms.