Static vulnerability of an existing r.c. structure and seismic retrofitting by CFRP and base-isolation: A case study |
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| Institution: | 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, PR China;2. College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, PR China;1. Department of Civil Engineering, University of Southern California, Los Angeles, CA 90089, USA;2. Department of Civil Engineering and Geodesy, University of Novi Sad, 21000 Novi Sad, Republic of Serbia;3. Crvena skopska op?tina 4/1-1, Skopje, Macedonia;1. Faculty of Geomatics Engineering, Department of Geodesy, K. N. Toosi University of Technology, Iran;2. School of Civil Engineering, College of Engineering, University of Tehran, Iran |
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| Abstract: | The assessment of the static vulnerability under gravity loads of existing reinforced concrete (r.c.) framed buildings is a serious problem that requires the use of reliable methodologies to evaluate ductile and brittle mechanisms. The present work compares alternative formulations of member chord rotation and section and joint shear strength, proposed by Italian and European seismic codes and guidelines and other expressions available in the scientific literature. To this end, a r.c. framed building built sixty years ago with bi-directional (perimeter) and mono-directional (interior) plane frames, originally designed for five storeys then elevated to six during construction, is studied. A full characterization of the structure and its materials is carried out by means of destructive and non-destructive methods. Then, retrofitting based on the use of both innovative material, such as carbon fibre reinforced polymers (CFRP), and technology, such as base-isolation, are adopted to improve the static and seismic performances of the original structure. Finally, nonlinear analyses are carried out on a three-dimensional fibre model of the original and retrofitted structures, where an elastic linear law idealizes the behaviour of the CFRP up to tension failure and viscoelastic linear and bilinear models are used to idealize the behaviour of the elastomeric and sliding bearings, respectively. |
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| Keywords: | R c framed structures Static vulnerability Base-isolation Carbon fibre reinforced polymers Nonlinear dynamic analysis |
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