Compressive membrane action in progressive collapse resistance of RC flat plates

Keyvani, Leila; Sasani, Mehrdad; Mirzaei, Yaser

doi:10.1016/j.engstruct.2013.10.040

Cited by 79 publications

(50 citation statements)

References 22 publications

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“…In the compressive phase, along with the downward deformation, the slab attempts to expand in-plane; oppositely, the lateral restraints, provided by columns, produce compressive stresses within the slab. The result of this compressive membrane stress is the considerable enhancement in punching shear strength although the damage continues to expand (Keyvani et al 2014). Cracks and crushing appear on both slab faces leading to an increase in tensile stresses in the reinforcement, ultimately forming tensile membrane action in the slab.…”

Section: Membrane Action In Progressive Collapsementioning

confidence: 99%

“…The punching shear failure, being the most critical type of shear failure, is discussed below. Hawkins and Mitchell (1979) and Keyvani et al (2014) suggested that the area most likely to trigger progressive collapse of a flat plate structure is the interior slab-column joint, primarily due to punching shear failure. If such a failure brings the inability of the interior column to bear load (i.e., column loss), the gravity loading previously taken by this column will be redistributed.…”

Section: Failure Mechanisms Pertinent To Rc Flat Platesmentioning

confidence: 99%

“…These cracks propagate in an inclined direction to form a critical shear surface. Aggregate interlocking and dowel action work together to transfer shear before the critical shear surface is allowed to go through the entire slab thickness (Keyvani et al 2014), upon which, a punching shear cone forms above the column. Meanwhile, the strength of concrete is reduced and the load is gradually transferred to the continuous reinforcement.…”

Section: Failure Mechanisms Pertinent To Rc Flat Platesmentioning

confidence: 99%

“…Moreover, the model was only loaded to a limited deformation state and the post punching shear behaviour of RC flat plates in progressive collapse was unable to be evaluated. Keyvani et al (2014) proposed an alternate modelling method to simulate the behaviour of a slab-column joint with emphasis on the post punching behaviour. The slab was modelled using shell elements whilst the reinforcement was explicitly modelled by beam elements.…”

Section: Numerical Simulations Of Rc Flat Platesmentioning

confidence: 99%

“…Progressive collapse is initiated as a consequence of local damage resulting in a chain effect throughout the structure and its elements, thereby leading to a disproportionately large extent of failure (Ellingwood 2006;Keyvani et al 2014). The failure growth is due to the stable load transfer paths being disturbed within the structure.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Current trends and developments in progressive collapse research on reinforced concrete flat plate structures

Xue¹,

Guan²,

Gilbert³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Progressive collapse of structures caused by extreme or accidental loads may lead to significant loss of life and property. Considerable research efforts have been made to date to mitigate the probability of progressive collapse and its consequences. This study summarises the fundamentals of progressive collapse in relation to the existing theoretical concepts and understanding. Specifically the existing theories pertinent to progressive collapse of building structures, in particular reinforced concrete (RC) flat plates, are examined from the following four key aspects: (1) definition of progressive collapse from deformation and/or strength perspectives with respect to the failure criteria of structural members and the entire structural system; (2) failure mechanisms of load-bearing systems undergoing progressive collapse with respect to the structural ultimate capacity, which has not been considered in the design process; (3) research methodologies for investigating collapse mechanisms, with emphases on experimental and numerical approaches; and (4) collapse-resistant design principles as covered in several international design standards in which a number of robustness requirements have been recognised. Based on the schematic review of the current trends and developments, gaps and limitations in progressive collapse research are identified and a new research direction is established to advance the progressive collapse study of RC flat plate structures.

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Section: Membrane Action In Progressive Collapsementioning

confidence: 99%

Section: Failure Mechanisms Pertinent To Rc Flat Platesmentioning

confidence: 99%

Section: Failure Mechanisms Pertinent To Rc Flat Platesmentioning

confidence: 99%

Section: Numerical Simulations Of Rc Flat Platesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Current trends and developments in progressive collapse research on reinforced concrete flat plate structures

Xue¹,

Guan²,

Gilbert³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

View full text Add to dashboard Cite

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Theoretical investigations on load‐bearing capacity of RC flat‐plate framed structures subject to middle column loss

Zhang

Wang

et al. 2017

Structural Design Tall Build

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Summary This paper presents theoretical studies on load‐bearing capacity of reinforced concrete flat‐plate framed structures. The existing methods for determining load‐bearing capacity of simply supported slabs are first reviewed, and their limitations are presented. An energy‐based refined method is then proposed to enhance the accuracy of the existing methods by considering the contributions to internal energy dissipation due to the extension of reinforcing bars along yield lines, the additional resultant bending moment from membrane forces, and the sectional bending moment along yield lines of slabs. The refined method for simply supported slabs is extended for fixed supported slabs, and thus, the load‐bearing capacity of reinforced concrete flat‐plate structures subject to a middle column loss is analytically determined. The performance of the proposed method is validated against test results and also verified against finite element analyses. Parametric studies are conducted to investigate the effect of reinforcement ratio, slab thickness and aspect ratio on the stiffness, and yield‐line resistance of structures. It is found that for the fixed supported slabs, it is reasonable to assume negative yield lines along the slab edges to consider the effect of obvious concrete crushing along the edge. Square slabs have higher ultimate loads than rectangular slabs, due to a longer horizontal yield line in the middle in the rectangular slab, which has detrimental effect on the sectional ultimate bending moment. The numerical results show that the reinforcement ratio has little effect on the initial bending stiffness and yield‐line resistance of slabs for a given slab thickness and aspect ratio. The initial stiffness and yield‐line resistance increase as the slab thickness increases. For the same reinforcement ratio and slab thickness, a larger aspect ratio leads to a lower initial bending stiffness, yield‐line resistance, and stiffness in tensile membrane action stage, due to a longer yield line along which tensile membrane forces have a detrimental effect on the sectional bending moment.

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Progressive Collapse Retrofit of a RC Hospital Building Using Steel Braces

Ferraioli

Lavino

Mandara

2021

Lecture Notes in Civil Engineering

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The progressive collapse retrofit of a RC hospital building making use of steel braces is described in the paper. The vulnerability of the construction when subjected to specific threat scenarios is preliminary analysed by removing critical column and applying the alternate load path method to evaluate the capability of the damaged structure to bridge across the removed column. A detailed threedimensional model of the building has been created to carry out both nonlinear static and nonlinear dynamic analyses. Both geometrical and material nonlinearities have been considered in the analysis in order to account for the inelastic behaviour following the sudden column removal and the possible subsequent catenary effects. In order to retrofit the building against progressive collapse the use of steel braces in some bays has been proposed, designed on the basis on simple equilibrium conditions under vertical loads. The retrofitting bracing system proved to be effective in improving the global building behaviour under several accidental scenarios.

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Compressive membrane action in progressive collapse resistance of RC flat plates

Cited by 79 publications

References 22 publications

Current trends and developments in progressive collapse research on reinforced concrete flat plate structures

Current trends and developments in progressive collapse research on reinforced concrete flat plate structures

Theoretical investigations on load‐bearing capacity of RC flat‐plate framed structures subject to middle column loss

Progressive Collapse Retrofit of a RC Hospital Building Using Steel Braces

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