【作者】 张宏志；

【导师】 王元战；

【作者基本信息】 天津大学 ， 港口、海岸及近海工程， 2006， 硕士

【摘要】 沉箱式防波堤作为港口、海岸工程建设中经常使用的水工建筑物之一,其在破碎波冲击作用下,破坏事例时有发生。本文借助大型通用有限元软件ANSYS,建立了沉箱式防波堤动力分析有限元模型,对沉箱式防波堤在破碎波作用下动力响应的数值模拟方法进行了研究。本文的主要研究工作如下:1本文采用目前国际上比较流行的大型通用有限元软件ANSYS,建立了沉箱式防波堤的有限元模型,对沉箱式防波堤动力响应的有限元计算方法进行了研究。2、通过在沉箱与基床之间设置接触面,较好的模拟了沉箱与基床之间的相对滑移、分开、闭合等状态,得到了沉箱式防波堤滑移距离、摇摆角等动力响应结果,验证了有限元方法的有效性。3、本文比较了几种现有的沉箱式防波堤动力计算简化模型,采用质量—弹簧—阻尼器系统分析模型,对破碎波冲击作用下沉箱式防波堤的数值分析模型和计算方法进行了研究。4、以有限元模型为基础,将简化模型和有限元模型中的地基参数进行比较分析,得出了适合大型防波堤的地基参数合理取值,并给出了相应的拟合公式。更多还原

【Abstract】 The caisson breakwater is a construction usually used in the port and offshore engineering works, which is sometimes destroyed under the force of breaking wave. In this paper, the dynamic finite element model of the caisson breakwater will be founded within the environment of the widely used software ANSYS, and the numerical method of the dynamical response of caisson breakwater will be studied. The main content included in the paper is as follows:1 The finite element dynamic model is founded in this paper using the giant popular finite element software ANSYS. The calculating method of the dynamical response of the caisson breakwater is researched.2 The contact surface is placed between the caisson and the bedding ,the state of sliding、opening、closing between the two parts is modeled well. The dynamical response result of the sliding distance and the rock angle of the caisson breakwater is acquired. So the effectivity of the finite element method is proved.3 The comparison between several simple models of the caisson breakwater is done. A dynamic analysis model with a mass-damper-spring system is used, the numerical analysis method of caisson breakwater under the breaking force is studied.4 Many kinds of theories and methods that have been used to compute the dynamic parameters of breakwaters are summarized and studied here. A new calculation method for the spring constants of foundation and the damping coefficients of foundation is presented.更多还原