摘要
既有结构的可靠度与抗力衰减、抗力后验分布、活荷载取值有密切的关系.文中借助现行荷载规范活荷载的分布函数,采用极大似然估计法,推导了指数型抗力衰减函数的参数计算公式和验证荷载下的抗力后验分布函数计算公式.在综合考虑抗力衰减、抗力后验分布与活荷载取值3个因素的情况下,选取线性功能函数和非线性功能函数计算了恒载和活载共同作用下的可靠度.计算结果表明,影响既有结构可靠度的3个主要因素中,其显著性程度按照由高到低的次序是:抗力衰减、抗力后验分布、活荷载取值(与目标使用期有关).
The reliability of an existing structure mainly depends on three factors, namely, the resistance degradation, the resistance posterior distribution and the live load. In this paper, according to the distribution function of live load presented by the existing load code and by using the maximum likelihood estimation method, the computational formulae respectively for the parameters of the exponential resistance degradation function and for the resistion of the above-mentioned three factors, the reliabilities of the structure under dead and live loads are respectively calculated with both linear and nonlinear performance functions. The results indicate that the three factors affect the reliability in the order （from the highest to the lowest） of resistance degradation, resistance posteriori distribution function and live load that is related to the goal service life.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第10期12-15,36,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省亚热带建筑技术公共实验室开放式基金资助项目(2005A60501001)
关键词
既有结构
可靠度
验证荷载
抗力衰减
活荷载
existing structure
reliability
proof load
resistance degradation
live load
