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论文类型：期刊论文

发表时间：2015-06-01

发表刊物：MATERIALS AND STRUCTURES

收录刊物：SCIE、EI、Scopus

卷号：48

期号：6

页面范围：1785-1802

ISSN号：1359-5997

关键字：Partially prestressed concrete beam; Non-prestressed reinforcement; Residual strain; Fatigue loading; Analytical model

摘要：This paper presents the results of an experimental and analytical study on the residual strain behavior of non-prestressed reinforcement in partially prestressed concrete (PPC) beams under fatigue loading. For the strain measurements, fiber Bragg grating sensors were used. Two beams were initially tested under monotonic loading in order to determine their ultimate load-bearing capacity. Six were tested under fatigue loading conditions. The experimental results show that fatigue failure mode of PPC beams is fracture of the non-prestressed reinforcement. Moreover, residual strain in the non-prestressed reinforcement gradually increases during the fatigue life and the corresponding residual strain evolution can be divided into three stages. Finally, an analytical model for estimating the residual strain of non-prestressed reinforcement in beams is developed. Comparisons of the predicted curves with the experimental data indicate a good agreement. The results of investigation in this paper furnish the experimental basis for the fatigue design and analysis of PPC beams.