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http://dx.doi.org/10.12989/sem.2022.83.3.363

Proposals for flexural capacity prediction method of externally prestressed concrete beam  

Yan, Wu-Tong (School of Civil Engineering, Beijing Jiaotong University)
Chen, Liang-Jiang (China Railway Economic and Planning Research Institute Co., Ltd.)
Han, Bing (School of Civil Engineering, Beijing Jiaotong University)
Wei, Feng (China State Railway Group Co., Ltd.)
Xie, Hui-Bing (School of Civil Engineering, Beijing Jiaotong University)
Yu, Jia-Ping (School of Civil Engineering, Beijing Jiaotong University)
Publication Information
Structural Engineering and Mechanics / v.83, no.3, 2022 , pp. 363-375 More about this Journal
Abstract
Flexural capacity prediction is a challenging problem for externally prestressed concrete beams (EPCBs) due to the unbonded phenomenon between the concrete beam and external tendons. Many prediction equations have been provided in previous research but typically ignored the differences in deformation mode between internal and external unbonded tendons. The availability of these equations for EPCBs is controversial due to the inconsistent deformation modes and ignored second-order effects. In this study, the deformation characteristics and collapse mechanism of EPCB are carefully considered, and the ultimate deflected shape curves are derived based on the simplified curvature distribution. With the compatible relation between external tendons and the concrete beam, the equations of tendon elongation and eccentricity loss at ultimate states are derived, and the geometric interpretation is clearly presented. Combined with the sectional equilibrium equations, a rational and simplified flexural capacity prediction method for EPCBs is proposed. The key parameter, plastic hinge length, is emphatically discussed and determined by the sensitivity analysis of 324 FE analysis results. With 94 collected laboratory-tested results, the effectiveness of the proposed method is confirmed, and comparisons with the previous formulas are made. The results show the better prediction accuracy of the proposed method for both stress increments and flexural capacity of EPCBs and the main reasons are discussed.
Keywords
externally prestressed concrete beam (EPCB); flexural capacity; second-order effects; simplified calculating method; stress increments;
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Times Cited By KSCI : 6  (Citation Analysis)
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