直接积分法在防波堤可靠性分析中应用  

Application of direct integration method in breakwater reliability analysis

作　　者：张磊[1] 董胜[1] 张向东[1] 

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《海洋工程》2011年第4期103-107,共5页The Ocean Engineering

基　　金：国家自然科学基金资助项目(50879085);"新世纪优秀人才资助计划"资助项目(NCET-07-0778)

摘　　要：防波堤是港口工程的重要组成部分,在港口工程总投资中占有较大的比重。准确地计算防波堤的可靠性具有重大的理论和经济意义。随着数理统计理论的快速发展,直接积分法在结构可靠性计算中的应用逐渐得到重视。应用直接积分法计算直立式防波堤的可靠性,概率意义明确,计算精度高。以秦皇岛典型直立堤为算例,采用直接积分法对直立式防波堤进行可靠性分析时,将无限积分区域转换成有限积分区域,分析选择了波浪力和浮托力的联合密度函数,采用数值积分的办法计算失效概率,并将计算结果与独立变量JC法和相关变量JC法的计算结果进行了对比。结果表明:直接积分法和相关变量JC法计算结果相近,而比独立变量JC法计算结果偏低。As the important components of port projects,breakwaters take large proportions in total investments.How to correctly determine breakwater reliability is of both academic and economic significance.With the development of statistical theory,direct iotegration method is gradually drawing more and more attention.The probabilistic meaning of the direct integration method is definite to calculate the failure probability of the vertical breakwaters.The calculation precision is higher because of a full consideration of the correlation between the variables.The domain of integration is processed,transforming the improper integral to the limited regional integral,according to fundamental principle of the direct integration method.The breakwater in Qinhuangdao is taken as an example to inspect and verify the direct integration method.The joint density function of the wave force and the uplifting pressure is selected after comparison.The failure probability is calculated by using numerical integration method.The calculation results are compared with those by JC methods.It can be concluded that the reliability indexes by the direct integration method are similar to those by the variable-correlated JC method,but are obviously lower than those by the variable-independent JC method.

关 键 词：直接积分法 直立式防波堤 可靠度 波浪力 浮托力 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程]