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External CFRP tendon members: Secondary reactions and moment redistribution
Affiliation:1. CEMUC, Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal;2. Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal;1. Politecnico di Milano, Department of Civil and Environmental Engineering, Piazza Leonardo da Vinci 32, 20133 Milan, Italy;2. Politecnico di Milano, Department of Architecture, Built Environment and Construction Engineering, Piazza Leonardo da Vinci 32, 20133 Milan, Italy;1. School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;3. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China;1. Department of Civil Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan, ROC;2. Department of Civil Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, ROC;3. Department of Civil Engineering, Manipal University Jaipur, Rajasthan, India;4. CECI Engineering Consultants, Inc., Taipei, Taiwan, ROC;5. Department of Civil & Environmental Engineering, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;6. School of Engineering and the Built Environment, Edinburgh Napier University, Edinburgh, Scotland, United Kingdom;1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450002, China;2. College of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, China;1. State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, China;2. School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China
Abstract:The response of prestress secondary reactions in the post-elastic range has been a topic of much controversy. Due to the brittleness of FRP (fiber reinforced polymer) composites, external FRP tendon members may have different moment redistribution characteristics compared to conventional concrete members. This paper presents a numerical investigation into the secondary reactions and moment redistribution in prestressed concrete continuous members with external CFRP tendons. The investigation parameters include the initial prestress level and the pattern of loading. The secondary reactions are computed using a newly developed method based on the linear transformation concept combined with a nonlinear finite element analysis. The results indicate that the secondary reactions increase quicker after concrete cracking and nonprestressed steel yielding. As a consequence, the secondary moment should be included in the design moment. The moment redistribution behavior for symmetrical loading is shown to be quite different from that for unsymmetrical loading. The study also shows that the effect of initial prestress on the moment redistribution is rather important.
Keywords:A. Fibres  B. Mechanical properties  C. Finite element analysis (FEA)  C. Computational modeling
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