Probabilistic failure analysis of reinforced concrete beam-column sub-assemblage under column removal scenario

Feng, De‐Cheng; Xie, Si-Cong; Deng, Wei; Ding, Zhaodong

doi:10.1016/j.engfailanal.2019.02.004

Cited by 87 publications

(25 citation statements)

References 43 publications

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“…The moment-rotation curve along the local y-axis was acquired afterwards, and during the analysis, the postcast concrete strength as well as the bond-slip tendency can be considered (i.e., changing the concrete grade and replacing the stress-strain with the stress-slip relationship in the unit-length fiber section analysis). 39 As the outside ABRB mainly undertakes the axial force, the truss element was adopted. The truss section equaled to the core plate section of the ABRB and the SteelMPF material was assigned to reflect the tensile/compressive properties respectively.…”

Section: Numerical Modelmentioning

confidence: 99%

Research on the seismic retrofitting performance of RC frames using SC‐PBSPC BRBF substructures

Cao

Feng

et al. 2020

Earthq Engng Struct Dyn

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A new type of external substructure to upgrade existing reinforced concrete frames (RCFs) is presented in this paper, namely, a self-centering precast bolt-connected steel-plate reinforced concrete buckling-restrained brace frame (SC-PBSPC BRBF). The upgrade mechanism and three-dimensional simulation model were analyzed based on relevant experiment validations. A quasistatic analysis and parameter study was conducted using 21 scenarios to compare the upgrading effects of the outside substructure. Afterwards, a stiffness-based design procedure was developed and modified for this external substructure, including macro-demand analysis, partial component design, and overall structural evaluations. Dynamic analyses were also performed on a frame building for five cases, before and after strengthening. The proposed numerical model reflected the precast characteristics and displayed the ideal fitting accuracy.The external assembled brace provided sufficient initial stiffness and energy dissipation capacity, while the external prestressed tendon decreased residual displacements and facilitated self-centering of the whole structure. The analyses illustrated that the damage to the existing RCF was transferred and seismic demands were significantly reduced within limitations, accompanied with greater capacity reliability. This research provides a reference for the practical applications of the external upgrading substructures in earthquake-prone areas.

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Section: Numerical Modelmentioning

confidence: 99%

Research on the seismic retrofitting performance of RC frames using SC‐PBSPC BRBF substructures

Cao

Feng

et al. 2020

Earthq Engng Struct Dyn

Self Cite

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“…This is usually taken into account by safety factors in the design standards, aiming for ensuring reliability and robustness of structures with a low computational cost, in a simplified approach. It has been recognized that a more thorough assessment of the influence of the material and design parameters variability is of interest [7][8][9][10]6,11], allowing for a more in-depth understanding of the underlying complex phenomena and interaction between these variables of intrinsically random nature.…”

Section: Introductionmentioning

confidence: 99%

“…A correlation-reduced LHS method was used to investigate the variability of RVs on the response of RC frames, showing that uncertainties have significant effects on the behavior of RC frames to mitigate PC. One of the recent works is the study of Feng et al [11] who employed the Probability Density Evolution Method (PDEM) to perform static push-down analysis of two benchmark column removal tests using fiber beam finite elements. The authors investigated the influence of material properties and uncertain geometrical parameters on the global and local behavior of RC sub-assemblages.…”

Section: Introductionmentioning

confidence: 99%

“…The vast majority of the numerical approaches above use commercial software [10,22] or open source software, such as OpenSees [23] or SeismoStruct [24] with a limited set of constitutive models by default [6,11]. In this contribution a computational approach based on probabilistic sampling to assess the structural robustness of a RC frame designed following the Eurocode [1] is proposed using an in-house developed framework with full control of the numerical ingredients and considering a large frame and SCL scenario.…”

Section: Introductionmentioning

confidence: 99%

“…Various sets of Random Variables are considered in the literature going from material [28,10,11,19,6], to load [29,19] and geometrical [19,6,21,11] parameters. As expected, when a large number of RVs are incorporated in the computational model, the required number of nonlinear computations skyrockets with a prohibitive computational cost, especially for realistic, large structures.…”

Section: Introductionmentioning

confidence: 99%

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Probabilistic modelling of the robustness of reinforced concrete frames accounting for material property variability using a layered beam finite element approach

Sosso

Andrade

Vieira

et al. 2020

Engineering Failure Analysis

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In this contribution the influence of material properties variability on the structural robustness of Reinforced Concrete (RC) frames is assessed using a computational approach. A layered beam finite element model is employed in a correlation reduced Latin Hypercube Sampling-based stochastic framework in which the material parameters driving the elastic, plastic and fracture behavior of both steel and concrete constituents are considered to be Random Variables (RVs). The probability characteristics of each RV are set to match relevant experimental data available in the literature. Structural robustness of each deterministic simulation is evaluated based on the outcome of a nonlinear dynamic progressive collapse computation using the Sudden Column Loss (SCL) scenario. The sensitivity of structural robustness and residual displacement to each material parameter is established first, considering their variations separately. The robustness of a RC frame designed following the European building code, incorporating all RVs simultaneously is assessed and critically compared to the results of the sensitivity analysis. The link between the structural degradation and failure mechanism and data extracted from the cross sectional behavior is established. The identification of structural mechanisms inducing failure or survival is attempted and a set of practically relevant recommendations for progressive collapse resistance is listed.

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Experimental study on the seismic performance of novel precast reinforced concrete grid moment‐resisting frames

Fan

et al. 2020

Structural Concrete

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A new structure named reinforced concrete grid moment-resisting frame (RC-GMRF) have been adopted in high-rise buildings in China. However, complex construction due to numerous beam-column joints restricts the application of this structure. A novel precast reinforced concrete GMRF (PC-GMRF) is proposed in this paper to solve this problem. Three specimens, including one traditional reinforced concrete moment-resisting frame (RC-MRF) as reference, were tested under reverse cyclic loading to evaluate the seismic performance. All three specimens were designed using the same amount of construction material. The experimental results showed that PC-GMRF exhibited comparable seismic performance with that of RC-GMRF. The load-carrying capacity, initial stiffness and energy dissipation capacity were improved by an average of 43%, 29%, and 21%, respectively, compared with those of RC-MRF. This study indicated that the performance of PC-GMRF was acceptable and could be used in the moment-resisting frame as a novel structure.

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Probabilistic failure analysis of reinforced concrete beam-column sub-assemblage under column removal scenario

Cited by 87 publications

References 43 publications

Research on the seismic retrofitting performance of RC frames using SC‐PBSPC BRBF substructures

Research on the seismic retrofitting performance of RC frames using SC‐PBSPC BRBF substructures

Probabilistic modelling of the robustness of reinforced concrete frames accounting for material property variability using a layered beam finite element approach

Experimental study on the seismic performance of novel precast reinforced concrete grid moment‐resisting frames

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