Gravity Load Collapse of Reinforced Concrete Columns with Brittle Failure Modes

Nakamura, Takaya; Yoshimura, Manabu

doi:10.3130/jaabe.1.21

Cited by 62 publications

(25 citation statements)

References 1 publication

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“…6). The shear degrading slope K deg is calibrated based on observations from previous tests [Nakamura and Yoshimura, 2002], which have shown that axial failure is initiated when shear strength degrades to about zero.…”

Section: Implementation Of Shear and Axial Failure Models In Openseesmentioning

confidence: 99%

Analytical Collapse Study of Lightly Confined Reinforced Concrete Frames Subjected to Northridge Earthquake Ground Motions

Ghannoum

Moehle

Bozorgnia

2008

Journal of Earthquake Engineering

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Review of older non seismically detailed reinforced concrete building collapses shows that most collapses are triggered by failures in columns, beam-column joints, and slab-column connections. Using data from laboratory studies, failure models have previously been developed to estimate loading conditions that correspond to failure of column components. These failure models have been incorporated in nonlinear dynamic analysis software, enabling complete dynamic simulations of building response including component failure and the progression of collapse. A reinforced concrete frame analytical model incorporating column shear and axial failure elements was subjected to a suite of near-fault ground motions recorded during the 1994 Northridge earthquake. The results of this study show sensitivity of the frame response to ground motions recorded from the same earthquake, at sites of close proximity, and with similar soil conditions. This suggests that the variability of ground motion from site to site (so-called intra-event variability) plays an important role in determining which buildings will collapse in a given earthquake.

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Section: Implementation Of Shear and Axial Failure Models In Openseesmentioning

confidence: 99%

Analytical Collapse Study of Lightly Confined Reinforced Concrete Frames Subjected to Northridge Earthquake Ground Motions

Ghannoum

Moehle

Bozorgnia

2008

Journal of Earthquake Engineering

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“…Several studies [Priestley et al 1994;Sezen 2002] have shown that, when the inelastic deformation increases, the shear strength decays; hence, the flexure-shear deterioration model should be based on both force and deformation. Also, after the flexure-shear degradation, the columns tend to lose their vertical carrying capacity [Nakamura and Yoshimura 2002]. In this work, flexure-shear and flexure-shear-axial deterioration are described with shear and axial limit curves respectively [Elwood 2004], respectively; such curves refer to the corresponding shear and axial springs that are series connected with the column fiber elements, see Fig.…”

Section: Flexure-shear and Flexure-shear-axial Deterioration Models Omentioning

confidence: 99%

Numerical Study on the Relevance of Columns Hidden Failure Modes in the Seismic Capacity of Non-Ductile RC Frames

Alfarah

Almansa

Oller

2018

Journal of Earthquake Engineering

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In simplified seismic structural analyses, not all the deterioration modes are adequately considered. This work discusses the relation among the hidden failure modes of columns of non-ductile RC building frames and their global collapse mechanism. With this aim, a numerically efficient model is developed and implemented in OpenSEES. Two benchmark problems are analyzed with this model: the well-known Van Nuys Hotel and a prototype building designed for gravity loads only; in this last case, the results are compared with experiments on a one-third scale model. The obtained results confirm that simplified models grossly overestimate the building capacity.

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“…Axial response of columns failing in shear has been experimentally studied previously [5][6][7][8][9][10][11][12]. The effect of system-level response on collapse analysis of structures was considered in Federal Emergency Management Agency P695 [13].…”

Section: Introductionmentioning

confidence: 99%

Near‐collapse response of existing RC building under severe pulse‐type ground motion using hybrid simulation

Murray

Sasani

2016

Earthq Engng Struct Dyn

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SUMMARYColumn shear-axial failure is a complex response, which lends itself to physical experimentation. Reinforced concrete structures built prior to the mid-1970s are particularly susceptible to such failure. Shearaxial column failure has been examined and studied at the element level, but current rehabilitation practice equates such a column failure with structural collapse, neglecting the collapse resistance of the full structural system following column failure. This system-level response can prevent a column failure from leading to progressive collapse of the entire structure. In this study, a hybrid simulation was conducted on a representative pre-1970s reinforced concrete frame structure under severe seismic ground motion, in which three full-scale reinforced concrete columns were tested at the University of Illinois at Urbana Champaign. The analytical portion of the model was represented in the computer program OpenSees. Failure occurred in multiple physical specimens as a result of the ground motion, and the hybrid nature of the test allowed for observation of the system-level response of the tested columns and the remaining structural system. The behavior of the system accounting for multiple column shear-axial failure is discussed and characterized.

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Gravity Load Collapse of Reinforced Concrete Columns with Brittle Failure Modes

Cited by 62 publications

References 1 publication

Analytical Collapse Study of Lightly Confined Reinforced Concrete Frames Subjected to Northridge Earthquake Ground Motions

Analytical Collapse Study of Lightly Confined Reinforced Concrete Frames Subjected to Northridge Earthquake Ground Motions

Numerical Study on the Relevance of Columns Hidden Failure Modes in the Seismic Capacity of Non-Ductile RC Frames

Near‐collapse response of existing RC building under severe pulse‐type ground motion using hybrid simulation

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