Structure-wave-seabed Coupling System Nonlinear Dynamic Analysis

In recent years, embedded large cylinder has further application in harbors, coast and off-shore engineering, In the mean time, the stability analytical research of seabed-wave-structure coupling system is one of the frontier projects at home and abroad. From the previous study, we know that the merely static stability analysis of large cylinder structure is far from demand. At present, many scholars at home and abroad are further investigating the mechanism of instability and failure of seabed-wave-structure coupling system.In order to analyze the dynamic stability of seabed-wave-structure coupling system, to further understand the instability and failure of this coupling system, in the thesis we contrasted the model test and based on the MSC.Marc software we established the dynamic finite element computing model of this coupling system. In the model, through second development, we improved the equivalent cut model of Harden model and under the effect of cycle loading, the token soft clay made the development law of pore pressure. Based on this pore pressure model fetch in Marc, we adopted PyMentat module of MSC.Marc Python, put the change of equivalent Damping ratio of the improved Harden model into the examples, analyzed the dynamic response of the seabed-wave-structure coupling system, emphasized review on the damping effect.Furthermore, we introduced Ramberg-Osgood nonlinear nonelastic model that frequently used in dynamic constitutive relation of material into the data model, calculated the dynamic response to the same coupling system, contrasted with the method of Harden equivalent linear, made out some valuable conclusion and had further understanding to the dynamic response of the coupling system.The research results made out in the thesis provide accumulation to the dynamic stability analysis of the same kind of structure system and give methodological support to the correlative research.