建筑物基础冲刷深度的可靠性分析  

Reliability Analysis of Structure Foundation Scouring Depth

作　　者：程永舟[1] 胡旭跃[1] 沈小雄[1] 

机构地区：[1]长沙理工大学河海工程学院

出　　处：《长沙交通学院学报》2004年第3期48-52,共5页Journal of Changsha Communications University

摘　　要：影响河流中建筑物附近局部冲刷的因素大多数是非确定性变量,传统的设计方法不能反映局部冲刷深度的不确定性,参数的取值与目标值或实际情况可能存在一些偏差,冲刷深度的计算值并不一定具有相应的保证率。分析了设计参数取值的不确定性、变异性以及基础埋置深度的变异,在现有的计算公式基础上,利用可靠度理论,以桥台为例,建立了桥台基础冲刷可靠性分析的数学模型,并介绍了利用蒙特卡罗法求解方程的过程。利用本计算方法可分析河流中建筑物基础埋置深度的可靠性以及水力条件的变化对基础冲刷破坏的影响。There are many factors affecting local scour around a structure in river. These factors are (indefinite) parameters. The traditional design method cannot reflect uncertainty of local scouring depth. There are great distinction between selective value and real value of parameters, and the calculated value of scouring depth does not meet expected safety demand. In this paper, the uncertainty of parameter value and the distortion (between) design value and real value are analyzed. Based on the present formulas and the (reliability) theory, the mathematical model to analyse the probability of abutment foundation depth was (established). The method of solving the equation through Monte Carlo method was introduced. By the method, the reliability of structure foundation depth can be quantitatively calculated and the effect of (hydraulic) conditions to foundation failure also can be discussed.

关 键 词：基础埋置深度 局部冲刷 可靠性 蒙特卡罗法 

分 类 号：U612[交通运输工程—船舶及航道工程]