Collapse Distribution Scenario in Seismic Progressive Collapse of RC Buildings Caused by Internal Column Elimination
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RESEARCH PAPER
Collapse Distribution Scenario in Seismic Progressive Collapse of RC Buildings Caused by Internal Column Elimination Somayyeh Karimiyan1 Received: 8 January 2019 / Accepted: 22 January 2020 © Shiraz University 2020
Abstract Prediction of the safety margin in the buildings against the progressive collapse mechanism due to the earthquake loads is a significant issue in the structural and earthquake engineering. In this paper, modeling of the collapse distribution and propagation in the structural elements, one after another, is investigated by tracking down the collapsed locations among the beam and column structural elements in the moment-resisting reinforced concrete short buildings, and the effects of the column removal are studied on the expansion and development of the progressive collapse due to the earthquake loads. A three-story reinforced concrete building designed with ordinary moment frames is modeled, and potential of the progressive collapse mechanism due to the internal column removal is studied using the results of nonlinear time history analyses in the presence of the two-component ground motion records proposed by FEMA_P695. According to the results, some approaches and proposals are presented to seismic optimization of the reinforced concrete short buildings against the progressive collapse mechanism. Also, a collapse distribution pattern is introduced to predict the progressive collapse propagation scenario due to the earthquake loads and the internal column removal. Keywords Progressive collapse · Collapse distribution · Reinforced concrete (RC) building · Internal column elimination · Nonlinear time history analysis
1 Introduction Progressive collapse is a partial and initial failure, which leads to the collapse of an entire structure, or large parts of the one, in such a way that the final destruction is much bigger than the initial failure. This mechanism can occur due to every threat or loading such as bomb or gas explosions, collision with a ship or aircraft, earthquakes, fires, accidental overload, etc. Advancement in the structural design and analysis techniques and development of performance-based design concepts besides structural collapse observations caused by natural and abnormal events have led researchers to review the structural behavior in abnormal conditions, which has not been considered in the usual designs. Recent research demonstrated that the most progressive collapse studies have investigated progressive collapse * Somayyeh Karimiyan [email protected] 1
Department of Civil Engineering, Islamshahr Branch, Islamic Azad University, Eslamshahr, Iran
potential due to the explosions, terrorist attacks, vehicle collisions and accidental overloads, and since most countries are located in the seismic regions, the progressive collapse mechanism due to the earthquakes has not been considered in the current studies, yet. Furthermore, the majority of traditional and old buildings all over the world are relatively short buildings and are without any seismic de
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