Influence of Multicolumn Removal on the Behavior of RC Floors

Qian, Kai; Li, Bing; Zhang, Zhongwen

doi:10.1061/(asce)st.1943-541x.0001461

Cited by 65 publications

(35 citation statements)

References 21 publications

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“…Yu and Tan performed two one‐half scale subassemblages under middle column removal to study the influence of seismic detailing. Ren et al, Lu et al, and Qian et al studied the progressive collapse behavior of RC floor system under middle column removal scenario and edge column removal scenario, respectively. Although these experimental studies give realistic results of RC structures against progressive collapse, they may be costly and time consuming.…”

Section: Introductionmentioning

confidence: 99%

Progressive collapse performance analysis of precast reinforced concrete structures

Feng

Wang

2019

Structural Design Tall Build

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In this paper, the progressive collapse performance analysis of precast reinforced concrete (RC) structures is performed. A numerical simulation framework for precast RC structures is developed on the basis of the OpenSEES software, where the fiber frame element is used for beam and column type members and Joint2D element is used for the beam-to-column connections. The conjugated material models are then introduced, and a min-max failure criterion is imposed on the original models to reflect the steel fracture and concrete crushing when the structure is undergoing progressive collapse. In addition, to overcome the computational difficulties arisen from progressive collapse behavior, two enhanced nonlinear solutions , that is, the consistent quasi-Newton algorithm and the explicit KRalgorithm, are employed, respectively, for static and dynamic analysis. A 10-storey prototype precast RC structures is designed to verify the developed numerical framework, and the progressive collapse resisting mechanism of the structures is investigated through both static pushdown analysis and dynamic column-removal analysis. Finally, influences of some typical parameters in precast RC structures on their progressive collapse performance are studied. KEYWORDScolumn removal, nonlinear analysis solution, numerical simulation, precast, progressive collapse, pushdown analysis, reinforce concrete structures INTRODUCTIONPrecast reinforced concrete (RC) structures are widely used in practical structural engineering due to its various advantages, for example, high efficiency, product quality, and low environmental pollution. Especially, in some developing countries such as China, the government has attached great importance to promote precast RC structural systems in recent years, because there exists a large demand of industrial and civilian buildings in their rapid process of urbanization. Therefore, it is of significant value to study the actual performance of the precast RC structures subjected to external loadings for better understanding the failure mechanism and developing appropriate design methods.In the past three to four decades, most studies on precast RC structures were focused on their seismic performance. The conventional way is to conduct cyclic loading tests [1,2] of the precast beam-to-column connections and/or develop high-fidelity finite element models [3,4] to assess the seismic performance (e.g., failure mode, cyclic behavior, and energy dissipation) of the corresponding precast structures. Nevertheless, as a new concern, progressive collapse performance of structures has attracted more and more attentions, [5][6][7] because the unexpected accidental events, for example, malicious attacks, gas explosion, vehicle impact, and human error, were frequently happening around the world in recent years and caused great loss of human lives and public properties. Although the probability of these extreme events is relatively small, the consequences are unbearable.The most common and effective way to assess the progressive col...

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Section: Introductionmentioning

confidence: 99%

Progressive collapse performance analysis of precast reinforced concrete structures

Feng

Wang

2019

Structural Design Tall Build

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“…The Ronan Point apartment building in London, UK, which partially collapsed after a gas explosion, and the Murrah Federal Building in Oklahoma City, Oklahoma, which was destroyed by a bomb explosion, are two symbolic events that have contributed to increase the worldwide interest on progressive collapse. Nonetheless, a few studies have been carried out to assess the influence of multi-column loss on nonlinear dynamics and progressive collapse resistance of reinforced concrete (RC) building structures [2][3][4]. This work is aimed at investigating the capacity of RC framed buildings subjected to either simultaneous or sequential, sudden loss of couples of columns at the ground floor.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Response and Progressive Collapse of Rc Framed Buildings Under Multiple Column-Loss Scenarios

Scalvenzi¹,

Parisi²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Progressive collapse consists in the spreading of local damage from element to element, which results in the collapse of the entire structure or a large part of it. To avoid progressive collapse, the structure should withstand events like fire, explosions, impact or the consequences of human error, without being damaged to an extent disproportionate to the original cause. In this study, nonlinear dynamic response of a reinforced concrete framed structure to multiple column-loss scenarios is investigated by means of fiber-based finite element capacity models and incremental-mass dynamic analysis. The influence of removal of two columns on the behavior of the structure is evaluated. The residual capacity of the structure was assessed under varying location and time of columns' removal. Two different multiple column-loss scenarios were explored, namely simultaneous and sequential removals. Analysis results allow the worst scenarios to be identified, as well as the sensitivity of progressive collapse resistance to be evaluated.

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“…Typically, an alternate path method is applied by instantaneously removing the potentially damaged member and to assess the progressive collapse resistance of the remaining to ensure alternative load transferring paths to bridge over the missing member. Many experimental studies have been launched to investigate the performance of framed substructures under various column‐removal scenarios. Peng et al conducted six interior slab‐column specimens without structural integrity reinforcement to examine their punching and postpunching behavior.…”

Section: Introductionmentioning

confidence: 99%

“…The recent events occurring in the United States [5,6] indicate that the civil engineering structures are under increasingly complicated surrounding conditions. Therefore, how to reduce the risk of progressive collapse of structures has gained increasing popularity among researchers and engineers [1][2][3][7][8][9][10][11][12][13][14][15][16][17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

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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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Influence of Multicolumn Removal on the Behavior of RC Floors

Cited by 65 publications

References 21 publications

Progressive collapse performance analysis of precast reinforced concrete structures

Progressive collapse performance analysis of precast reinforced concrete structures

Nonlinear Dynamic Response and Progressive Collapse of Rc Framed Buildings Under Multiple Column-Loss Scenarios

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

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