基于分项系数法的既有框架结构可靠性评估  

Reliability Evaluation of Existing Frame Structure Based on Partial Coefficient Method

作　　者：黄炎生[1] 邓浩[1] 罗仁志[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2008年第12期34-37,共4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)

摘　　要：为了对既有框架结构的可靠性进行评估,采用全随机过程模型的简化模型,根据既有结构抗力与荷载的特点,建立了既有框架结构基于分项系数法的可靠性评估表达式;随后,应用现行规范中计算目标可靠度的校准法,在不降低结构可靠性指标的前提下,推导了不同目标使用期下最优荷载和抗力分项系数的计算公式,并通过编程计算了不同目标使用期的抗力和荷载分项系数,以及不同目标使用期下的地震作用折减系数.算例表明,该评估表达式可以比较方便地应用于既有框架结构的可靠性评估.In order to evaluate the reliability of existing frame structures , a simplified fully-stochastic process model is adopted and the characteristics of structural resistances and loads are considered to establish a reliability appraisal formula for existing frame structures based on the partial coefficient method. Then, on the premise of maintaining the reliability of the structures, the calibration method of target reliability specified in the current design codes is employed to deduce some calculation formulas of the partial coefficients for both optimum load and resistance at different target periods of usage. Finally, by developing a program, the corresponding partial coefficients as well as the earthquake reduction factors for different target periods of usage are calculated. It is indicated by example that the proposed reliability appraisal formula can be conveniently applied to the reliability evaluation of existing frame structures.

关 键 词：既有结构 目标使用期 分项系数 可靠性评估 

分 类 号：TU312[建筑科学—结构工程]