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论文类型：期刊论文

发表时间：2014-02-01

发表刊物：ADVANCES IN STRUCTURAL ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：17

期号：2

页面范围：179-196

ISSN号：1369-4332

关键字：partially prestressed concrete beam; strain; strain range ratio; stress redistribution; fatigue life

摘要：The objective of this paper is to investigate the steel stress/strain variation and redistribution in partially prestressed concrete (PPC) post-tensioned T-beams with bonded tendons under various ranges of fatigue loading by using an embedded Fiber Bragg Grating (FBG) sensor. A total number of six beams were tested to failure under fatigue loading, and two control beams were tested for determing the monotonic bearing capacity. Test results indicated that the initial fatigue failure of all beams was caused by fatigue fracture of the non-prestressed reinforcement rather than failure of the prestressing strands. Based on the strain recorded, the development trends of non-prestressed steel strain and the ratio of strain range between prestressed and non-prestressed reinforcement during fatigue loading were described. Moreover, an analytical model for fatigue life prediction of partially prestressed concrete beams by using the sectional analysis and local strain-life method was developed. Good agreement between analytical and experimental results for fatigue life of PPC beams is observed.