考虑抗力退化的T形截面既有受弯构件时变可靠度计算方法  

Calculating Method of Time-Dependent Reliability of Existing Bending Structure with T-Shape Section Considering Resistance Deterioration

作　　者：郑怡[1,2] 刘明[1] 刘兴元[3] 沈小俊[4] 高飞[2,4] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]重庆交通大学桥梁结构工程重点实验室,重庆400074 [3]沈阳市浑河管理中心,辽宁沈阳110011 [4]重庆市公路工程质量检测中心,重庆400060

出　　处：《沈阳建筑大学学报（自然科学版）》2009年第5期853-857,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家十一五科技支撑计划重大项目(2006BAJ03A01-05);重庆交通大学结构工程重点实验室开放基金项目(CQSLBF-Y07-4);沈阳建筑大学结构工程省级重点实验室开放基金项目(JG200705)

摘　　要：目的建立T形截面既有受弯钢筋混凝土结构时变可靠度计算模型,为既有受弯构件可靠性评估提供计算依据.方法在同时考虑混凝土和钢筋损伤以及材料强度劣化的情况下,结合规范中的设计计算公式与时变可靠度的特点,分析以往可靠性鉴定的缺陷,研究T形截面既有受弯钢筋混凝土结构承载力时变计算公式.结果提出了T形截面既有受弯钢筋混凝土结构承载力时变计算方法,并提出了判别是Ⅰ类T形还是Ⅱ类T形的时变判断条件,经计算可靠指标1.68<2.28,与现行可靠性鉴定标准的结果相吻合.结论结合工程实例进行计算分析,计算结果验证了本方法的正确性和科学性,提供了连续式评级方法.该方法易于工程技术人员掌握,可为健康诊断的研究提供基础.Time-dependent reliability calculating model about existing bending member of reinforced concrete with T-shape section was set up for the purpose of providing calculation basis of reliability evaluation of it. Considered of damage of concrete and steel, and under the condition of materials being deterioration, it was posed that time-dependent strength calculating model on existing bending member of reinforced concrete with T-shape section. And it was given that the simple calculating formula of time-dependent resistance and time-dependent reliability indexes. By means of analyzing disadvantages of appraisal reliability and combi- ning with characteristics of time-dependent reliability, the time-dependent determining condition was given, which judged that the structure is I kind of T-shape or 11 kind of T-shape. Reliability index is 1.68 〈 2.28, and the calculated result is good fit with current appraisal reliability standard. Combined the example, calculating results prove that the method is correct and scientific. This method is easily grasped for the engineers and supplies basis of health diagnosis.

关 键 词：既有受弯构件 抗力退化 时变可靠度 时变判断条件 连续式评级 

分 类 号：TU312[建筑科学—结构工程]