Shear design of reinforced concrete beams with FRP longitudinal and transverse reinforcement |
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| Affiliation: | 1. Universitat Politècnica de Catalunya, Barcelona, Spain;2. Universitat de les Illes Balears, Palma de Mallorca, Spain;1. Department of Civil Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada;2. Lapointe Engineering Ltd, Canada;3. School of Engineering, The University of British Columbia, Kelowna, BC V1V 1V7, Canada;1. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China;2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China;3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;4. Harbin FRP Institute, Harbin 150000, China;1. Laboratory of Reinforced Concrete, Department of Civil Engineering, Democritus University of Thrace (DUTh), 67100 Xanthi, Greece;2. Composite Material Research Laboratory, Department of Mechanical Engineering, University of New Orleans, LA 70148, USA;1. Department of Civil Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India;2. Department of Civil Engineering, Guru Ghasidas Vishwavidyalaya (A Central University), Chhattisgarh 495009, India |
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| Abstract: | The shear resisting mechanisms of reinforced concrete (RC) beams with longitudinal and transverse FRP reinforcement can be affected by the mechanical properties of the FRP rebars. This paper presents a mechanical model for the prediction of the shear strength of FRP RC beams that takes into account its particularities. The model assumes that the shear force is taken by the un-cracked concrete chord, by the residual tensile stresses along the crack length and by the FRP stirrups. Failure is considered to occur when the principal tensile stress at the concrete chord reaches the concrete tensile strength, assuming that the contribution of the FRP stirrups is limited by a possible brittle failure in the bent zone. The accuracy of the proposed method has been verified by comparing the model predictions with the results of 112 tests. The application of the model provides better statistical results (mean value Vtest/Vpred equal to 1.08 and COV of 19.5%) than those obtained using the design equations of other current models or guidelines. Due to the simplicity, accuracy and mechanical derivation of the model it results suitable for design and verification in engineering practice. |
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| Keywords: | B Strength B Stress transfer C Analytical modelling FRP stirrups |
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