随机波作用下大直径圆柱壳结构的非线性动力响应及仿真

xperimental mechanism investigation was carried out on dynamic interaction between the large-diameter cylindrical shell structure and foundation (seabed) under random waves. Important characteristics of dynamic nonlinear response of this coupling system were found and summarized. By analyzing experimental data both in the time and frequency domains and surveying the real state of structural instability, the mechanism of instability and failure of the deeply embedded large cylindrical structure in the critical working state was explored and interpreted. The main reason inducing instability and failure of the structural system was proposed. The structure, wave and foundation were considered to be a coupling system in analysis by numerical simulation. Some key topics in the numerical model were studied, including the action of random waves on the structure, dynamic nonlinear interface effects and dynamic nonlinear constitutive relations of foundation soil. The mechanism of dynamic interaction between structure, wave and foundation, and the state of structural instability and failure can be simulated preliminarily in the model. The purpose of this study was to solve key technical problems in engineering analysis, and meanwhile many frontier research topics in the academic area were involved directly. It is believed that the present achievements can not only raise the level of engineering analysis for this type of structure and hence promote its applications, but also be beneficial to analyzing correlative academic problems in areas of hydraulic, harbor, ocean and civil engineering.

对大直径圆柱壳结构在随机波（波浪或地震动）作用下的非线性动力响应进行研究，包括波载的数学模拟以及对结构与地基土体及松散介质动力相互作用力学机理的研究，由此建立并提出此类结构的动力分析数值计算模型和方法。本研究是对近年来发展起来、极具应用前景的港口和近海工程结构形式进行更深层次的研究，为工程应用提供可靠的理论依据。