Computer-Aided Assessment of Progressive Collapse of Reinforced Concrete Structures according to GSA Code

Helmy, Huda; Salem, Hamed; Mourad, Sherif A.

doi:10.1061/(asce)cf.1943-5509.0000350

Cited by 31 publications

(15 citation statements)

References 5 publications

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“…Thus, aspects that are ignored in this work, but may significantly influence structural behaviour under column loss, are the effect of three-dimensional modelling and load redistribution, the catenary action developed in slabs and beams, the behaviour of connections, etc. In particular, it has been shown (e.g., Fascetti, Kunnath, & Nisticò, 2015;Helmy, Salem, & Mourad, 2013) that neglecting three-dimensional/catenary action effects in progressive collapse analysis leads to overestimation of structural response quantities and underestimation of overall system strength. Therefore, the structural designs identified in the present paper can be considered to be conservative to some degree.…”

Section: Discussionmentioning

confidence: 99%

The cost of satisfying design requirements on progressive collapse resistance – Investigation based on structural optimisation

Charmpis

Kontogiannis

2015

Structure and Infrastructure Engineering

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This work is concerned with the explicit treatment of progressive collapse resistance within the structural design process. Progressive collapse resistance is associated with the damage tolerance of a structural system and controls the ability of the system to sustain local damage by absorbing the potential of triggering system collapse and suffering disproportionally large consequences. This work focuses on the design of elastoplastic steel frames. The measure of progressive collapse resistance employed is expressed as a ratio comparing the limit loads obtained with elastoplastic analyses of the intact structure and of an artificially damaged structure ('damage' is caused by the notional removal of a column from the intact structure). This measure is used to incorporate a constraint on progressive collapse resistance into a structural design optimisation formulation, which -in its classical form -takes only standard design code constraints into account and aims at minimising the structural cost. The developed optimisation approach is capable of producing cost-effective structural designs with acceptable system damage tolerance. By enforcing the satisfaction of the additional design requirement on progressive collapse resistance, structural cost is inevitably increased due to the need for extra material. This increase is quantitatively explored with the presented structural design optimisation approach.

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Section: Discussionmentioning

confidence: 99%

The cost of satisfying design requirements on progressive collapse resistance – Investigation based on structural optimisation

Charmpis

Kontogiannis

2015

Structure and Infrastructure Engineering

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“…In this study, the Extreme Loading for Structures (ELS) software (www.appliedscienceint.com), which is based on the AEM, is used. The AEM was proven to be capable of following the deformations of a structure subjected to extreme loads to its total collapse (Sasani and Sagiroglu 2008;Sasani 2008;Park et al 2009;Wibowo et al 2009;Galal and ElSawy 2010;Salem et al 2011;Helmy et al 2009;Helmy et al 2012;Helmy et al 2013;Sasani 2008;Salem 2011;Salem and Helmy 2014 ). Therefore, and since the goal of the current study is to investigate the collapsing behavior of Utatsu Ohashi bridge under severe loads resulting from tsunami action, it was decided that the AEM would be the most appropriate numerical tool for such investigation.…”

Section: The Applied Element Methods (Aem)mentioning

confidence: 99%

“…Therefore, in the current study, the numerical analysis was carried out using the Applied Element Method. The Applied Element Method is based on discrete crack approach and is capable of following the structure's behavior to its total collapse Meguro and Tagel-Din 2001;Tagel-Din 2002;Meguro and Tagel-Din 2003;Tagel-Din and Rahman 2004;Galal and ElSawy 2010;Sasani and Asgitoglu 2008;Salem et al 2011;Park et al 2009;Helmy et al 2009;Helmy et al 2012;Helmy et al 2013;Sasani 2008;Wibowo 2009;Salem 2011;Salem and Helmy 2014) …”

Section: Introductionmentioning

confidence: 99%

Collapse Analysis of Utatsu Ohashi Bridge Damaged by Tohuku Tsunami using Applied Element Method

Salem

Mohssen²,

Kosa

et al. 2014

ACT

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The 2011 Tohuku tsunami on the east coast of Japan resulted in killing more than 15,000 people and missing more than 2,500 people, washing away of more than 250 coastal bridges and loss of US$235 billion. Collapse of coastal bridges due to tsunami impact represents a huge obstacle for rescue works. Therefore, in the current study, the collapse of Utatsu Ohashi bridge is numerically studied. The analysis is carried out using the Applied element Method due to its advantages of simulating structural progressive collapse. The AEM is a discrete crack approach, in which elements can be separated, fall and collide to other elements in a fully nonlinear dynamic scheme of computations. The Utatsu Ohashi bridge collapse was successfully simulated using AEM. It was numerically found that the amount of trapped air between deck girders during tsunami had a significant effect on the behavior of the bridge. This is attributed to the buoyant force accompanied with the trapped air. A simplified method for estimating trapped air was assumed and proved to give reasonable results compared to reality. Three different solution examples for mitigating collapse of similar existing bridges were introduced and applied to Utatsu Ohashi bridge case and found to be efficient for preventing collapse.

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“…Helmy et al, [13], evaluated progressive collapse potential of a 10-story RC frame. They developed a computer program for nonlinear dynamic analysis with ELS software (Extreme Loading for Structures) and removed items were columns and shear wall.…”

Section: Progressive Collapse Analysis Of Reinforced Concretementioning

confidence: 99%

Progressive Collapse Analysis of Reinforced Concrete Structures: A Simplified Procedure

Naji¹,

Rohani²

2017

EJERS

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In this paper, a simplified analysis procedure to calculate the column removed point displacement at progressive collapse analysis of reinforced concrete structures is proposed. The energy absorption capacity under the column missing event is used for formulations. The approximate method is simple to utilize, user friendly, yet accurate. For progressive collapse analysis of structures, linear static analysis, nonlinear static analysis, linear dynamic analysis and nonlinear dynamic analysis can be performed. In this paper, the nonlinear static analysis from alternate load path method is used and the reason of initial local collapse has not been considered. In fact, an energy-based method by using load-displacement curve of RC frame and considering the effect of floor slab for the progressive collapse analysis is considered. The accuracy of the proposed method is demonstrated by comparing the results to three experimental and analytical results. Finally, the effects of the spans length, sections dimensions, material properties and the beams reinforcements of column removed spans on substructure behavior is studied, as well.

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Computer-Aided Assessment of Progressive Collapse of Reinforced Concrete Structures according to GSA Code

Cited by 31 publications

References 5 publications

The cost of satisfying design requirements on progressive collapse resistance – Investigation based on structural optimisation

The cost of satisfying design requirements on progressive collapse resistance – Investigation based on structural optimisation

Collapse Analysis of Utatsu Ohashi Bridge Damaged by Tohuku Tsunami using Applied Element Method

Progressive Collapse Analysis of Reinforced Concrete Structures: A Simplified Procedure

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