海洋平台损伤诊断及非线性动力响应的应用

Damage Diagnosis on Offshore Platform and Application of Nonlinear Dynamic Response

结合动力学和有限元方面的知识,以杭州湾跨海大桥海洋平台为背景,分别从固有频率和模态应变能损伤因子两个方面对损伤进行评估和定位。然后基于平台的工作环境,考虑了波浪力、水流力和阻尼等作用因素,用有限元软件进行了非线性动力响应分析,根据位移和截面应变变化率的变化情况进行损伤诊断,同时为今后大型海洋平台的损伤诊断提出建议和方法。

According to dynamics and finite element method and based on the Hangzhou Bay See-Crossing Bridge offshore platform, estimation and localization on damage were carried out in terms of natural frequencies and damage factor of modal strain energy. Considering wave force, current force, damping and so on, analysis of nonlinear dynamic responses was proceeded by the finite element software. Damage diagnosis was performed through the variation amplitude of displacement and changing rate of cross-section strain. Meanwhile, suggestions and methods were put forward for the damage diagnosis on complex offshore platforms in the future.