改进的等效线性化计算模型及在结构海床耦合系统动力分析中的应用

为探究结构-波浪-海床耦合系统的失稳破坏机理并建立能反映此机理的计算模型,将改进的哈丁模型引入等效线性化方法,使其能反映载荷频率、循环周次以及土体平均有效主应力等多因素的影响。该模型运用于结构-波浪-海床耦合系统的非线性动力响应分析,一方面与标准哈丁模型的计算结果以及在波浪水槽进行的模型实验进行了比较,另方面着重对土体模量退化以及接触面附近土体的强度软化进行了考察,获得了一些明确的认识。

Modified Equivalent Linear Computational Model and Application in Dynamic Analysis of Seabed-Structure Coupling System

In order to investigate the mechanism of instability and failure of seabed-wave-structure coupling system and develop a corresponding computational model that can take account of the mechanism,a modified Hardin model is introduced in the equivalent linear method in the present study.Some important factors such as the effective mean principal stress of soil,frequency of cyclic loading,and number of cycles of loading are included in the model.The computational model is used in a seabed-wave-structure coupling system to analyze its dynamic nonlinear response.The results are compared with not only the results from a standard Hardin model but also the model experiments carried out in a wave flume.Degradation of modulus of soil mass and softening of strength of soil near the soil-structure interface are investigated in detail.Some clear understandings are obtained and summarized.