期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 322, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.126480
关键词
RC beam; Chloride exposure; High-cycle fatigue; Fatigue life; Reliability assessment
资金
- National Natural Science Fund (NSF) of China [52108106]
This study investigates the fatigue life of reference reinforced concrete (RC) beams and the residual fatigue life of RC beams after pre-fatigue loading and chloride exposure. It is found that fatigue behaviors significantly degrade when the pre-fatigue cycles range from 1% to 30% of the reference fatigue life, with more obvious degradations observed when the cycles reach 10% of the reference fatigue life. The fatigue life of corroded and uncorroded beams can be modeled using the two-parameter Weibull distribution, and a reliability assessment method is proposed to determine the minimum safety fatigue life of RC structures with chloride exposure.
Fatigue life of reference RC beams (N-u) and residual fatigue life of RC beams after pre-fatigue loading (0.01-1.2 million cycles, similar to 0.2% similar to 30%N-u) and chloride exposure (3, 6 months) in sequence, were tested. Fatigue behaviors significantly degrade at the pre-fatigue cycles of 1% to 30%N-u, where obvious degradations are shown as the pre-fatigue cycles increase to 10%N-u. Fatigue life of corroded and un-corroded beams can be modeled by the two-parameter Weibull distribution at a given load level, and hence a reliability assessment method is proposed to give the minimum safety fatigue life of RC structures with chloride exposure.
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