Effect of retrofit strategies on mitigating progressive collapse of steel frame structures

Galal, Khaled; El-Sawy, Tamer

doi:10.1016/j.jcsr.2009.12.003

Cited by 55 publications

(27 citation statements)

References 5 publications

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“…For example, in instances of "small" initial variations from horizontal (i.e., shallow modified catenary), truss analysis is not appropriate and nonlinear geometry must be considered. Forms of this shallow modified catenary can be seen in several structural applications: progressive collapse retrofit [23,24], progressive collapse resisted by concrete reinforcement [9,20], overhead wires for electric rail [25,26], and ice loads and wind-on-ice loads on electrical power lines [27,28]. This paper investigates fundamental modified catenary (M.C.)…”

Section: Introductionmentioning

confidence: 99%

“…behavior and presents a preliminary model that describes the static and dynamic nonlinear catenary behavior of structural elements with minimal flexural stiffness, for example, retrofit cables. Cables attached at column supports and along the beam can be used to provide or supplement load carrying capacity under loss of column support conditions [23,24,29,30]. Upon loss of column support, the beam and cable initially resist load in tandem according to the existing capacity of the beam and its connections.…”

Section: Introductionmentioning

confidence: 99%

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A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

2018

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Progressive collapse, the extensive or complete collapse of a structure resulting from the failure of one or a small number of structural components, has become a focus of research efforts and design considerations following events occurring at the Ronan Point apartment building in London, the Murrah Federal Building in Oklahoma City, and the World Trade Center in New York City. A principle research and design area for progressive collapse investigates the behavior of structural frames when column support is removed. The mechanism that results from loss of column support in structural frames characteristically involves beams that are unable to provide sufficient flexural resistance. Cable retrofit is one method to enhance existing frames and supplement or replace the post-mechanism beam load resistance with straight-legged catenary resistance after a column removal. The cables are located linearly along the beam geometry and are affixed at beam supports. This paper investigates both static and dynamic behavior of the catenary action of retrofit cables, which include both the linear and nonlinear material behavior of the cable material. Moreover, a simplified model serves as the basis for retrofit cable design is presented. Finite element modeling and experimentation in this paper verify and validate the applicability of the model. Finally, a framework for developing a procedure for retrofit cable design is presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

2018

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“…Fully nonlinear dynamic analysis for the structure due to removal of a primary vertical element is carried out using the Applied Element Method (AEM). AEM is based on discrete crack approach and is capable of following the structure's behavior to its total collapse (Galal and El-Sawy 2010;Sasani and Sagiroglu 2008;Salem et al 2011;Park et al 2009;Helmy et al 2009;Sasani 2008;Wibowo et al 2009;Tagel-Din and Rahman 2004;Salem 2011).…”

Section: Introductionmentioning

confidence: 99%

Infilled masonry walls contribution in mitigating progressive collapse of multistory reinforced concrete structures according to UFC guidelines

Helmy¹,

hadhoud

Mourad

2015

Int J Adv Struct Eng

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A structure is subjected to progressive collapse when an element fails, resulting in failure of adjoining structural elements which, in their turn, cause further structural failure leading eventually to partial or total collapse. The failure of a primary vertical support might occur due to extreme loadings such as bomb explosion in a terrorist attack, gas explosion and huge impact of a car in the parking area. Different guidelines such as the General Services Administration (GSA 2003) and the Unified Facilities Criteria (UFC 2009) addressed the structural progressive collapse due to the sudden loss of a main vertical support. In the current study, a progressive collapse assessment according to the UFC guidelines is carried out for a typical ten-story reinforced concrete framed structure designed according to codes [(ACI 318-08) and (ASCE 7-10)] for minimum design loads for buildings and other structures. Fully nonlinear dynamic analysis for the structure was carried out using Applied Element Method (AEM). The investigated cases included the removal of a corner column, an edge column, an edge shear wall, internal columns and internal shear wall. The numerical analysis showed that simplification of the problem into 3D bare frames would lead to uneconomical design. It was found for the studied case that, the infilled masonry walls have a valuable contribution in mitigating progressive collapse of the reinforced concrete framed structures. Neglecting these walls would lead to uneconomical design.

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“…Apart from these equivalent quasi-static approaches, which constitute a major part of the related literature, non-linear dynamic procedures were recently conducted for both reinforced concrete and steel structures, to a variable extent of complexity [9][10][11][12][14][15][16][17][18][19][20][21][22]. While in most of the recent works the structures are still modelled using 2D frames [9,11,12,14,19,20], full non-linear 3D dynamic computations with geometrically nonlinear formulations are sometimes found in the literature related to steel structures [18,22].…”

Section: Introductionmentioning

confidence: 99%

“…While in most of the recent works the structures are still modelled using 2D frames [9,11,12,14,19,20], full non-linear 3D dynamic computations with geometrically nonlinear formulations are sometimes found in the literature related to steel structures [18,22]. Nevertheless, such detailed approaches are scarce for reinforced concrete structures, partially due to the high complexity involved in the modelling of the sectional response of heterogeneous RC beams.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the influence of design and material parameters in the progressive collapse analysis of RC structures

Iribarren

Berke

Bouillard

et al. 2011

Engineering Structures

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This contribution deals with the modelling of reinforced concrete (RC) structures in the context of progressive collapse simulations. One-dimensional nonlinear constitutive laws are used to model the material response of concrete and steel. These constitutive equations are introduced in a layered beam approach, in order to derive physically motivated relationships between generalised stresses and strains at the sectional level. This formulation is used in dynamic progressive collapse simulations to study the structural response of a multi-storey planar frame subjected to a sudden column loss (in the impulsive loading range). Thanks to the versatility of the proposed methodology, various analyses are conducted for varying structural design options and material parameters, as well as progressive collapse modelling options. In particular, the effect of the reinforcement ratio on the structural behaviour is investigated. Regarding the material modelling aspects, the influence of distinct behavioural parameters can be evaluated, such as the ultimate strain in steel and concrete or the potential material strain rate effects on the structural response. Finally, the influence of the column removal time in the sudden column loss approach can also be assessed. Significant differences are observed in terms of progressive failure pattterns for the considered parametric variations.

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Effect of retrofit strategies on mitigating progressive collapse of steel frame structures

Cited by 55 publications

References 5 publications

A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

Infilled masonry walls contribution in mitigating progressive collapse of multistory reinforced concrete structures according to UFC guidelines

Investigation of the influence of design and material parameters in the progressive collapse analysis of RC structures

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