vibration Article Robustness of Reinforced Concrete Frames against Blast-Induced Progressive Collapse Mattia Francioli 1 , Francesco Petrini 1, * , Pierluigi Olmati 2 and Franco Bontempi 1 Citation: Francioli, M.; Petrini, F.; Olmati, P.; Bontempi, F. Robustness of Reinforced Concrete Frames against Blast-Induced Progressive Collapse. Vibration 2021, 4, 722–742. https:// doi.org/10.3390/vibration4030040 Academic Editors: Christoforos Dimopoulos and Charis J. Gantes Received: 1 June 2021 Accepted: 14 September 2021 Published: 18 September 2021 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). 1 Department of Structural and Geotechnical Engineering, Sapienza University of Rome, 00185 Rome, Italy; [email protected] (M.F.); [email protected] (F.B.) 2 Consultant, Explosion and Impact Engineering, Tokyo 153-8515, Japan; [email protected] * Correspondence: [email protected]; Tel.: +39-06-4458-5072 Abstract: A quantitative procedure for the robustness and progressive collapse assessment of rein- forced concrete (RC) frames under blast load scenarios is presented. This procedure is supported by multilevel numerical models, including nonlinear numerical analyses of the structural response of both local (i.e., response of the single structural element to the blast load) and global levels (i.e., response of the structural system to the blast-induced damage). Furthermore, the procedure is ap- plied to a 2D RC frame structure. The novelty of the proposed procedure is that the global robustness is evaluated by the so-called “damage-presumption approach” where the considered damages are defined both in typology and extension depending on the blast scenario occurring at the local level. The dedicated local response analysis of a specified blast scenario leads to the proper definition of the so-called “blast-scenario dependent robustness curves”. Keywords: performance analysis; structural robustness; blast-induced damage; nonlinear dynamics 1. Introduction Although the events of progressive collapse have a very low probability of occurrence, the consequences usually have a very high impact on society [1]. Progressive collapse can be triggered by many factors such as blast loading from explosives or gas leakage, design errors, vehicle impact, construction errors, debris impact, and other extreme loadings such as fire and earthquake [2,3]. In many instances, a significant propagation of direct damage to key structural compo- nents throughout the structure have produced a progressive collapse of residential, iconic, and public buildings, resulting in huge losses of life and property [4]. The interest in blast-induced damage started after an important event, which was the partial collapse of the Ronan Point tower in the UK in 1968 [5]. In this context it is important to introduce robustness as a crucial structural per- formance requirement. However, robustness is still the subject of controversy over its definition and quantification, and research activity on the topic has furnished substantial and useful recommendations for its assessment and for a robustness-oriented structural design [6]. A comprehensive definition of structural robustness is reported in Eurocode 1 (EN 1991-1-7, 2006) [7] as “the ability of a structure to resist events such as fires, explosions, impacts or the consequences of human error, without being damaged in a disproportionate way compared to the original cause”, that explicitly refers to the kind of actions that are relevant to the robustness. Despite this mention of different hazards that the structural robustness should face, one of the most established procedures for robustness analyses in research is based on the so-called “damage-presumption approach”, that is a “hazard- independent” analysis where a certain damage level is assumed for the structure, and the residual strength of the structure is then evaluated. Typically for a framed structure the presumed damage consists of the sudden removal of a column, something that will be referred to a “column removal” method in what follows. Common damage-presumption Vibration 2021, 4, 722–742. https://doi.org/10.3390/vibration4030040 https://www.mdpi.com/journal/vibration
Robustness of Reinforced Concrete Frames against BlastInduced Progressive Collapse
Jun 14, 2023
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