海洋平台结构系统静强度可靠性分析

Analysis of Static Strength Reliability for Offshore Platform Structure System

本文研究了对三维模型的导管架平台结构系统静强度可靠性评估方法。在极值载荷条件下,分别以极限冲剪应力及屈曲临界应力作为管节点及杆件的极限强度,采用增量载荷法建立破坏模式安全裕量方程。同时研究了求取结构系统主要失效模式的自动算法及计算系统失效概率的方法。作为一个算例,运用作者开发的计算机程序,对一固定式导管架平台进行了可靠性分析,验证了本方法对开展三维模型平台结构系统静强度可靠性评估是可行的。

This paper studies the evaluation method of static strength reliability on 3-dimensional model for off-shore platform structure system. Under the condition of extreme loading, limiting punching shear and critical buckling stress , are used separately as the limit strength of pipe joint and structural member, and the incre-mental loading method are adopted to establish a safety allowance equation for destruction model. And in the same time , the paper also studies the automatic calculating method for the main failure model of the structure system and the method of failure probability of the calculating system. As an example, applying the computer program developed by the author, the realiability of a fixed jacket platform is analysed, and thereby this method is verified to be feasible for evaluating static strength reliability of platform structure system of 3-di-mensional model.