Progressive collapse of 2D reinforced concrete structures under sudden column removal
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RESEARCH ARTICLE
Progressive collapse of 2D reinforced concrete structures under sudden column removal El Houcine MOURIDa* , Said MAMOURIa, Adnan IBRAHIMBEGOVICb a
Mechanics of Structures Laboratory, Mechanics, Modeling and Experimentation Laboratory, Department of Mechanical Engineering, University of Tahri Mohamed-Bechar, Bechar 08000, Algeria b Roberval Mechanics laboratory, Alliance Sorbonne University, Compiegne 60203, France *
Corresponding author. E-mail: [email protected]
© Higher Education Press 2020
ABSTRACT Once a column in building is removed due to gas explosion, vehicle impact, terrorist attack, earthquake or any natural disaster, the loading supported by removed column transfers to neighboring structural elements. If these elements are unable to resist the supplementary loading, they continue to fail, which leads to progressive collapse of building. In this paper, an efficient strategy to model and simulate the progressive collapse of multi-story reinforced concrete structure under sudden column removal is presented. The strategy is subdivided into several connected steps including failure mechanism creation, MBS dynamic analysis and dynamic contact simulation, the latter is solved by using conserving/decaying scheme to handle the stiff nonlinear dynamic equations. The effect of gravity loads, structureground contact, and structure-structure contact are accounted for as well. The main novelty in this study consists in the introduction of failure function, and the proper manner to control the mechanism creation of a frame until its total failure. Moreover, this contribution pertains to a very thorough investigation of progressive collapse of the structure under sudden column removal. The proposed methodology is applied to a six-story frame, and many different progressive collapse scenarios are investigated. The results illustrate the efficiency of the proposed strategy. KEYWORDS failure mechanism, MBS dynamic analysis, gravity loads, structure-ground contact, structure-structure contact, energy conserving/decaying scheme
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Introduction
When one or more structural members fail due to an explosion, a natural disaster, vehicle impact or any other extreme action, the structure becomes unstable and no longer stays in a state of equilibrium. To find a new equilibrium state under such extreme action and gravity loads, we ought to relieve the damaged zone with the transfer to the surrounding structural elements. The redistribution of these actions and gravity loads through the structure leads to the propagation of the damage in the remaining structural elements, resulting in progressive collapse of such structure [1]. Historically, the spur in research in the domain of progressive collapse was the result of the collapse of Ronan Point Apartment in 1968 in Newham, East London, where a gas explosion caused the progressive collapse of Article history: Received Jun 26, 2019; Accepted Sep 18, 2019
the building [2]. However, researches in the area of progressive collapse increased drastically after t
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