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Shear strengthening of reinforced concrete beams using epoxy bonded steel plates, cfrp sheets and externally anchored stirrups

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This research presents the effectiveness of different shear strengthening methods using epoxy bonded steel plates, steel strips, carbon fiber reinforced plastics (CFRP) sheets and externally anchored stirrups for enhancing the shear strength of RC beams. In this study, an experimental program including two series of twelve specimens was carried out to investigate the behavior of RC beams strengthened with the above methods. | Vietnam Journal of Mechanics, VAST, Vol. 30, No. 4 (2008), pp. 299 – 306 Special Issue of the 30th Anniversary SHEAR STRENGTHENING OF REINFORCED CONCRETE BEAMS USING EPOXY BONDED STEEL PLATES, CFRP SHEETS AND EXTERNALLY ANCHORED STIRRUPS Ha Minh1 and Hiroshi Mutsuyoshi2 Consultant and Inspection Joint Stock Company of Construction Technology and Equipment - CONINCO 2 Saitama University, Japan 1 Abstract. This research presents the effectiveness of different shear strengthening methods using epoxy bonded steel plates, steel strips, carbon fiber reinforced plastics (CFRP) sheets and externally anchored stirrups for enhancing the shear strength of RC beams. In this study, an experimental program including two series of twelve specimens was carried out to investigate the behavior of RC beams strengthened with the above methods. Further, a numerical analysis using finite element method (FEM) was performed to simulate the behavior of strengthened beams. The effectiveness of using epoxy bonded steel plates, CFRP sheets and externally anchored stirrups for shear strengthening of RC beams is confirmed through both numerical and experimental results. 1. INTRODUCTION Rehabilitation of existing concrete structures is now one of the major activities of the construction industry. Concrete structures deteriorate due to many reasons such as corrosion of internal reinforcement, carbonation, chloride attack, freeze-thaw action, etc. A number of civil infrastructures are in state of serious deterioration around the world. Further, poor initial design and construction faults also render existing concrete structure deficient. However, the other important reason for strengthening concrete structures is due to continuous upgrading of design codes and increased live load, as the requirements demanded of infrastructures grow with the development of the society. In Japan, for example, the design vehicle load for highway bridges has recently been increased from 196 kN to 245 kN. There is