Investigation of story ductility demands of inelastic concrete frames subjected to repeated earthquakes |
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| Affiliation: | 1. Fakultas Teknik, Universitas Muhammadiyah Sumatera Utara, Medan, Indonesia;2. Disaster Research Nexus, School of Civil Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, P. Pinang, Malaysia;3. Department of Environmental Engineering, Democritus University of Thrace, Xanthi, Greece;1. Facultad de Ingeniería, Universidad Autónoma de Sinaloa, Calzada de las Américas y B. Universitarios s/n, C.P. 80040 Culiacán, Sinaloa, Mexico;2. Instituto de Ingeniería, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, C.P. 04510 México D.F., Mexico;1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;2. Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, Heilongjiang, China;3. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;1. Department of Civil Engineering, Aristotle University, Thessaloniki 54124, Greece;2. Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA;1. Dept. of Civil & Environmental Engineering, Michigan Technological Univ., Houghton, MI 49931, United States;2. Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523-1372, United States |
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| Abstract: | The present study focuses on the influence of repeated earthquakes on the maximum story ductility demands of three-dimensional inelastic concrete frames. A comprehensive assessment is conducted using generic frames with 3-, 6-, 12-, and 18-story structures. Each is assumed to have behaviour factors of 1.5, 2, 4, and 6 referring to Eurocode 8. Stiffness and strength degrading hysteresis rule to represent reinforced concrete structure is considered in the plastic hinge of members. Twenty ground motions are selected, and single, double, and triple events of synthetic repeated earthquakes are considered. Some interesting findings are provided showing that repeated earthquakes significantly increase the story ductility demand of inelastic concrete frames. On average, relative increment of maximum story ductility demand is experienced 1.4 and 1.3 times when double and triple events of repeated earthquakes are induced, respectively. Empirical relationships are also provided to predict these increments where their efficiency is presented examining characteristic 3- and 8-story reinforced concrete buildings. |
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