基于海浪谱的沉箱式防波堤动力分析方法  

A method for dynamic analysis of caisson breakwaters based on wave spectrum theory

作　　者：王元战[1] 洪宁宁[1] 唐照评 

机构地区：[1]天津大学建筑工程学院天津市港口与海洋工程重点实验室,天津300072 [2]中交第三航务工程勘察设计院,上海200032

出　　处：《海洋工程》2007年第3期1-6,39,共7页The Ocean Engineering

基　　金：国家自然科学基金资助项目(50579046);天津市科技攻关基金资助项目(043114711)

摘　　要：利用海浪谱JONSWAP谱生成随机波浪,并结合改进的波浪力时程模型生成一个连续的、持续时间相对较长的随机波浪力作用过程。假设五十年设计基准期内防波堤每年遭受一次风暴,利用波浪谱随机生成五十次风暴波浪作用过程,对防波堤五十年设计基准期的响应过程进行一次随机模拟,以此作为一个样本。经过对大量随机模拟产生的样本进行统计分析,实现对防波堤整个设计基准期内的安全度进行概率评估。最后,通过算例对该方法的应用进行了演示。It is necessary to make the dynamic stability analysis of caisson breakwaters! due to the transient dynamic characteristics of wavebreakwater-foundation interaction under the wave excitation. In the existing methods, only the short duration of waves is considered. However, the safety of the whole life cycle of a breakwater is more concerned in practice. In this paper, a series of random waves has been generated by the JONSWAP wave spectrum and the histories of continuous and long-lasting random wave forces are built up by using the improved time history model of wave force. It is assumed that the storm wave takes place once a year during the 50 - year design life cycle, and 50 histories of random waves are generated by wave spectrum, The corresponding responses of the breakwater to the 50 histories of random waves are calculated and taken as a set of samples, The probability assessment of the safety of breakwaters during the whole design life cycle is made by statistical analysis of a large number of the samples. Finally, the procedure of probability assessment of breakwater safety is illustrated by an example.

关 键 词：沉箱式防波堤 设计基准期 动力稳定性 随机波浪 海浪谱 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]