Progressive Collapse Assessment of RC Structures under Instantaneous and Gradual Removal of Columns

Rahai, Alireza; Asghshahr, Mohammadreza Seify; Banazedeh, Mehdi; Kazem, Hamid

doi:10.1260/1369-4332.16.10.1671

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…Kwasniewski (2010) also developed a detailed 3D model to evaluate the progressive collapse resistance of an eight-storey steel frame in the Cardington Fire Test. The structural responses of RC structures under instantaneous and gradual removal of columns were also compared by Rahai et al (2013).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of progressive collapse resistance of reinforced concrete frames subject to column removals from different stories

Guan

et al. 2016

Advances in Structural Engineering

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This article presents a nonlinear static pushdown analysis to evaluate the progressive collapse-resisting capacity curves of typical reinforced concrete frames under different deformations. Unlike the previous studies in which only a few typical columns, such as a column on the bottom storey, are removed, this study examines the column removal scenarios for various typical locations from different stories. The primary findings are as follows: (1) the Vierendeel action causes different internal forces in the beams of different stories, which reduces the progressive collapse resistance under the beam mechanism and delays the development of the catenary mechanism. This may result in the beams failing successively from one floor to another in a frame system, which differs from the theoretical assumption that the beams are damaged simultaneously on different floors; (2) seismic designs significantly improve the progressive collapse resistance under the beam mechanism, especially for lower stories. However such an improvement is less significant for the catenary mechanism and little improvement is found for the top regions of the frame structures. Furthermore, a nonlinear dynamic analysis is conducted to validate the predicted resistances of the reinforced concrete frames in satisfying the requirement of collapse prevention. The design parameters as specified in the existing codes are also discussed.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of progressive collapse resistance of reinforced concrete frames subject to column removals from different stories

Guan

et al. 2016

Advances in Structural Engineering

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“…The study indicated that collapse mechanism of composite frame consisted of six stages including elastic, elastic-plastic, arch, plastic, transient and catenary stages; and the catenary action could enhance the resistance of rigid composite frame evidently. Rahai et al [10] addressed progressive collapse in a five-story reinforced concrete building model resulting from gradual removal of columns due to fire propagation in a specific zone of structure and compared the results with the findings in the scenario of instantaneous removal of column. Xiao et al [11] conducted three tests of a three-bay x three-bay, three-story and half-scale RC frame following a series of sudden column removals.…”

Section: Introductionmentioning

confidence: 99%

Parametric Analysis on Collapse-resistance Performance of Reinforced-concrete Frame with Specially Shaped Columns Under Loss of a Corner Column

Zhang¹,

Zhao²,

Wang³

et al. 2016

TOBCTJ

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A finite element model is verified accurate enough to simulate the static test of one reinforced-concrete frame with specially shaped columns subjected to the loss of a ground corner column. As the frame sustained loads primarily depending on the beam resisting mechanism in the test, four related parameters, namely the height of beam section, rebar ratio of beam, rebar ratio of slab and limb length of specially shaped column are chosen for parametric analyses respectively. It is indicated that the collapseresistance capacity remarkably increases with the increasing of the height of beam section and rebar ratio of the lower steel bars of beam. The increase of the rebar ratio of slab and upper steel bars of beam could enhance the stiffness and collapse-resistance capacity slightly. The lengthening of the limb of specially shaped column only increases the stiffness of the frame. According to an equivalent method, the rectangular column frame is obtained to compare collapse-resistance performance with the specially shaped column frame. It is concluded that the frame with specially shaped columns could maintain the equivalent collapse-resistance capacity while reduce the lateral stiffness compared with the rectangular column frame.

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“…They concluded that the sudden column loss is a useful design scenario for assessing structural robustness and may result in an upper bound of the deformation under blast events. Rahai et al (2013) compared the instantaneous and gradual column-removal responses of an RC structure and revealed that the former induced higher stress and deformation demand on the structure. So far, most studies regarding the rise-time effect were mainly carried out with dynamic time-history analyses.…”

Section: Introductionmentioning

confidence: 99%

Application of the work-energy principle to assess the risetime effect on the dynamic response amplification under column loss

Tsai¹

2015

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

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Progressive collapse analysis of building structures is usually performed under sudden column loss conditions. This means that the bearing capacity of the targeted column disappeared instantaneously. Hence, a time length less than one tenth of the natural period in the gravitational direction of the damaged structure has been recommended for disabling the targeted column in the numerical analysis. The time length required for disabling the postulated column in dynamic progressive analysis is defined as the rise time. Most seismically designed structural members may have a minimum ductility capacity as regulated in design codes. When the column is subjected to a devastating abnormal loading, it may gradually lose its load-carrying ability with increased deflection. Thus, the column strength is completely lost within a finite rise time. In other words, the dynamic loading for progressive collapse analysis of the remaining structure is increased gradually rather than instantaneously. This study intends to apply the work-energy principle to investigating the rime-time effect on the dynamic response amplification under column loss. A single-degree-of-freedom (SDOF) model is used to derive the analytical formulation with consideration of the rise-time effect. It is constructed with an assumption that the maximum imposed loading can be attained before yielding. Analytical procedures for calculate the force-and displacement-based dynamic increase factors (DIFs) are proposed. Nonlinear time-history analyses are then carried out to evaluate the accuracy of the proposed approach. The analysis results indicate that the dynamic amplification will decrease with increased finite rise time. The rise-time effect decreases with increased plastic demand. For practical application, the rise-time effect may be reasonably neglected as the ductility demand is larger than 5.0 and the normalized loading is larger than 1.5 for the force-and displacementbased DIFs, respectively. Its influence on the column-loss response may vary with the ratio of the rise-time length to the natural period and the extent of plastic deformation.

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Progressive Collapse Assessment of RC Structures under Instantaneous and Gradual Removal of Columns

Cited by 10 publications

References 18 publications

Numerical investigation of progressive collapse resistance of reinforced concrete frames subject to column removals from different stories

Numerical investigation of progressive collapse resistance of reinforced concrete frames subject to column removals from different stories

Parametric Analysis on Collapse-resistance Performance of Reinforced-concrete Frame with Specially Shaped Columns Under Loss of a Corner Column

Application of the work-energy principle to assess the risetime effect on the dynamic response amplification under column loss

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