【作者】 董少伟；

【导师】 王元战；

【作者基本信息】 天津大学 ， 港口、海岸及近海工程， 2004， 硕士

【摘要】 传统的防波堤设计中用于稳定性验算的近破波波浪力荷载均是按照静力荷载进行考虑的,没有考虑破碎波和防波堤运动的动力特性。本文运用蒙特卡罗法和动力分析方法,对沉箱式防波堤在随机模拟近破波作用下的动力响应进行了研究。文中采用质量—弹簧—阻尼器集总参数系统,对沉箱式防波堤可能的四种运动形式:振动、振动—滑移运动、振动—摇摆运动以及振动—滑移—摇摆耦合运动建立了相应的分析模型且通过模型实验数据进行了验证,并借助蒙特卡罗法,对沉箱式防波堤在振动—滑移运动和振动—滑移—摇摆耦合运动两种运动形式下的动力响应进行了概率统计分析和研究,从而为以后的动力设计方法提供理论指导。本文的主要研究成果如下:1.建立了将沉箱防波堤视为一个在地基上运动的刚体,而地基则用弹簧——阻尼器系统来代替的动力分析模型,并推导出计算公式。该模型能够模拟近破波作用下沉箱式防波堤可能的四种运动形态并能计算出位移、转角等响应参量。2.通过实验室提供的规则波模型实验数据对论文中使用的动力分析模型和数值模拟方法进行验证,证明了动力模型及相关理论的可靠性,为实际工程的初步设计提供了理论基础。3.将蒙特卡罗方法引入到防波堤的动力设计中,对沉箱式防波堤在随机模拟近破波作用下的动力响应进行了研究。考虑滑移破坏是沉箱式防波堤破坏的主要形式,确定了以滑移距离为主要研究对象,对能够产生滑移运动的振动—滑移运动和振动—滑移—摇摆耦合两种运动形式进行了动力分析,得出了滑移位移及其它响应参量的概率统计信息,为防波堤的动力设计方法提供了一种概率设计的新思路。更多还原

【Abstract】 In the traditional design method of breakwaters, breaking wave pressure whichapply to stability checking computations is considered as a static force, and dynamiccharacteristics of breaking wave and breakwater motion are neglected. In this paper,the dynamic responses of caisson breakwater under simulated stochastic wave forcesare studied through Monte Carlo simulation and dynamic analysis means. The paperapply mass-spring-damper general parameters system to establish a correspondinganalysis model of cassion breakwater’s four types of motions including vibrading,vibrading-sliding, vibrating-rocking and vibrating-sliding-rocking coupled motion,and check and prove the model by experiment data. And through Monte Carlosimulation, the dynamic responses of caisson breakwater under vibrading-sliding andvibrating-sliding-rocking coupled motion are statistically analysed and studied so asto provide theory instruction to dynamic design method of breakwaters.The qmain content included in the paper is as follows:1. A dynamic analysis model where the breakwater is considered as rigid bodyand the base is replaced by spring-damper system is founded and the correspondingcomputational formular are deduced. The model can simulate the four types ofpossible motions of caisson breakwaters under breaking wave impact and work outdynamic response parameters.2. Through the data provided by regular wave model experiment, a dynamicanalysis model and the corresponding numerical analysis method are checked andproved to be reliable which will provide theory instruction to dynamic design methodof breakwaters.3. Apply Monte Carlo simulation to research the dynamic responses of caissonbreakwater under simulated stochastic wave forces. As the slide is the main failureform, the paper makes certain the sliding disaplacement is the main research object,analyses the dynamic responses of caisson breakwater under vibrading-sliding andvibrating-sliding-rocking coupled motion, and works out statistical results of slidingdisaplacement and other response parameters so as to provide a new statistical designway to dynamic design method of breakwaters.更多还原