Evaluation of low-cycle fatigue damage in RC exterior beam-column subassemblages by acoustic emission |
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| Affiliation: | 1. Department of Mechanics of Structures, University of Granada, 18071 Granada, Spain;2. Department of Applied Physics, University of Granada, 18071 Granada, Spain;1. Université de Lyon, Ecole Nationale d’Ingénieurs de Saint-Etienne (ENISE), Laboratoire de Tribologie et de Dynamique des Systèmes (LTDS), UMR 5513, 58 rue Jean Parot, 42023 Saint-Etienne Cedex 2, France;2. Institute of Construction Engineering, University of Transport and Communication of Hanoi – Vietnam 03 Cau Giay, Lang Thuong, Dong Da, Hanoi, Viet Nam;3. Centre Scientifique et Technique du Bâtiment (CSTB), 84 avenue Jean Jaurès, Champs-sur-Marne, 77447 Marne-la-Vallée Cedex 2, France;1. Institute for Risk and Disaster Reduction, University College London, London, United Kingdom;2. Department of Structural and Geotechnical Engineering, University of Rome “La Sapienza”, Rome, Italy;3. Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand;4. Department of Civil, Environmental and Landscape, Building Engineering and Chemistry, Polytechnic University of Bari, Bari, Italy;1. Faculty of Civil and Environmental Engineering, Technion Israel Institute of Technology, Haifa 32000, Israel;2. Abel Wolman Chair in Civil Engineering, Faculty of Civil and Environmental Engineering, Technion Israel Institute of Technology, Haifa 32000, Israel;1. Institute of Advanced Technologies, Togliatti State University, 445667, Russia;2. Department of Data Science and Analytic, CGnal s.p.a., Via Carducci 38, 20122 Milano, Italy;3. Department of Engineering Design and Materials, Norwegian University of Science and Technology – NTNU, Trondheim 7491, Norway;1. Department of Environmental Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan;2. Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan;3. Department of Architecture and Architectural Engineering, Kyoto University, Nishikyo, Kyoto 615-8540, Japan;4. Institute of Urban Innovation, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan;5. Department of Structural Engineering, Building Research Institute, Tsukuba, Ibaraki 305-0802, Japan |
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| Abstract: | Since Acoustic Emission (AE) is effective in monitoring the initiation of cracks in materials and structures, it has been widely used as a real-time evaluation technique for damage in reinforced concrete (RC) elements such as beams or columns in moment-resisting frames. This paper investigates its applicability for assessing the low-cycle fatigue damage in RC exterior beam-column subassemblages, which are especially vulnerable parts of the RC frames when subjected to earthquakes. Two 3/5 scale specimens representing connections from the lower and upper part of a prototype building located in a moderate-seismicity area are tested under cyclic loading until collapse. Important differences between the two specimens are observed owing to the different size and amount of reinforcing steel. First, a significant increase in AE activity is observed when the steel reinforcement begins to undergo plastic deformations. Second, by means of the AE improved b-value method, it is clearly shown that the macroscopic fracture processes occur mainly during the loadings paths. Thus, on the basis of AE source location with four sensors situated around the beam-column joint, the AE is successfully correlated with the observed cracks. A strong correlation is also found between the accumulated plastic strain energy dissipated by the concrete and the accumulated AE energy. Based on this fact, a formula is proposed to predict the level of damage and the closeness to failure of an exterior beam-column subassemblage from the AE as recorded by sensors located near the joint. |
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