Seismic fragilities of non-ductile reinforced concrete frames with consideration of soil structure interaction |
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| Institution: | 1. Dept. of Civil Engineering, Faculty of Engineering, Monash University, Clayton Campus, Vic 3800, Australia;2. School of Engineering, The University of British Columbia, Okanagan, 3333 University Way, Kelowna, BC, Canada V1V 1V7;1. Isfahan University of Technology, Esfahan 8415683111, Iran;2. University of Isfahan, Esfahan 8174673441, Iran;1. Consulting Engineer, GR-58100 Giannitsa, Greece;2. School of Science and Technology, Hellenic Open University, GR-26335 Patras, Greece;3. Department of Civil Engineering, University of Patras, GR-26500 Patras, Greece;4. Office of Theoretical and Applied Mechanics, Academy of Athens, GR-11527 Athens, Greece;5. Institute of Soil Mechanics and Rock Mechanics, K.I.T., D-76128 Karlsruhe, Germany;1. School of Engineering and Information Technology, Faculty of Science and Technology, Federation University Australia, Australia;2. Centre for Built Infrastructure Research, School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), Australia;1. Department of Civil Engineering, University of Bristol, United Kingdom;2. School of Engineering, University of British Columbia, Canada;1. School of Civil Engineering, Iran University of Science & Technology, Tehran 16844, Iran;2. School of Civil Engineering, University of Tehran, Enghelab Ave., Tehran, Iran;3. Department of Civil and Architectural Engineering, Sungkyunkwan University, Suwon, Republic of Korea;1. Université de Bordeaux, I2M/dépt. GCE, UMR CNRS 5295, bat. B18, Av des Facultés, 33405 Talence, France;2. LM2SC, Université des Sciences et de la Technologie d’Oran, BP 1505, El M’naouar, 31000 Oran, Algeria |
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| Abstract: | Seismic fragilities of buildings are often developed without consideration of soil-structure interaction (SSI), where base of the building is assumed to be fixed. This study highlights effect of SSI and uncertainty in soil properties such as friction angle, cohesion, density, shear modulus and Poisson's ratio and foundation parameters on seismic fragilities of non-ductile reinforced concrete frames resting in dense silty sand. Three-, five-, and nine-storey three-bay moment resisting reinforced concrete frames resting on isolated shallow foundation are studied and the numerical models for SSI are developed in OpenSees. Three sets of 10 ground motions, with mean spectrum of 100, 500, and 1000 yr return period hazard level (matching EC-8 design spectrum), are used for the nonlinear time history analyses. An optimized Latin Hyper Cube sampling technique is used to draw the sample of soil properties and foundation parameters. The fragilities are developed for the fixed base model and SSI models. However, the fragilities that incorporate the soil parameter and foundation uncertainties are only slightly different from those based solely on the uncertainty in seismic demand from earthquake ground motion, suggesting that fragilities that are developed under the assumption that all soil and foundation parameters at their median (or mean) values are sufficient for the purpose of earthquake damage or loose estimation of structures resting on dense silty sand. But the consideration of the SSI effect has the significant influence on the fragilities compare to the fixed base model. The structural parameter uncertainty and foundation modeling uncertainty are not considered in the study. |
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