Abstract: Considering?the?damage?of?concrete?and?steel?as?well?as?the?condition?that?materials?are?deteriorated?with?time?at?the?same?time,?the?time-dependent?computation?model?of?existing?bending?structure?with?double?reinforced?rectangular?section?is?studied?according?to?the?design?and?computing?formulas?in?the?code.?The?simplified?calculation?formula?of?time-dependent?resistance?and?time-dependent?reliability?indexes?are?also?given.?This?method?is?applied?to?an?actual?engineering?project,?and?the?calculation?results?prove?that?it?is?fit?with?the?results?of?current?reliability?evaluation?standard.

Key words: existing bending structure , double reinforced rectangular section , time-dependent reliability , resistance deterioration ;

摘要： 在同时考虑混凝土损伤和钢筋损伤及材料强度随时间劣化的情况下,结合规范中的设计计算公式,研究既有 双筋矩形截面受弯构件抗力时变计算模型,并给出其时变抗力计算简化公式和时变可靠度指标。结合工程实例进 行了计算分析,计算结果验证了本方法与现行可靠性鉴定标准的结果相吻合。

关键词: 既有受弯构件, 双筋矩形截面, 时变可靠度, 抗力劣化