基于污染分布可靠度分析中分项系数的确定

Determination of partial safety coefficients of structural reliability based on contaminated distribution

摘要:

为研究人因误差影响下的结构可靠性设计分项系数,应用污染分布模型来确定随机误差和人因误差作用下的结构参数变量X的均值与方差.并在此定量分析的基础上合理地确定结构可靠度分析中的分项系数值.研究结果表明:目前的可靠度分项系数研究中没有考虑施工过程中人因误差这一不确定性因素的影响,其研究结果与实际情况存在偏差.在不确定性因素的影响下,为保证建筑结构可靠度达到即定的安全水平,在相应的目标可靠度指标β下,必须合理准确地确定其安全分项系数.

Abstract:

In order to study the partial safety coefficient concerned the effect of human error in construction.The contaminated distribution model was employed to obtain the realistic mean value and standard variance of variable X of structural parameters which coexisted with random error and human error.The reasonable partial safety coefficient can be calculated based on the realistic value of structural parameters concerned the effects of random error and gross error.The results show that the current studies of partial safety factors do not consider human error in construction for structural reliability.It is not comply with the real situation.Partial safety factors must be evaluated precisely for the given target β to ensure the certain level of structural reliability due to uncertain factors.