New Extended Finite Element Method for Pinching Effect in Reinforced Concrete Columns

Yu, Jiangtao; Yu, Kequan; Shang, Xingyan; Lu, Zheng

doi:10.14359/51688747

Cited by 20 publications

(19 citation statements)

References 17 publications

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“…And because there is no traction between the cracked surfaces when concrete cracks close, an elastic–plastic constitutive model concerning the isotropic hardening law is adopted for modelling the behaviour of concrete under compression for the computing stability. According to a previous study, the calculated (not artificially inputted) cyclic constitutive behaviour of concrete has good agreement with the experimental results …”

Section: The Proposed Model In Simulationsupporting

confidence: 73%

Using XFEM to model the effect of different axial compression on the hysteretic behaviour of the flexure‐dominant RC columns

Zhan

et al. 2018

Structural Design Tall Build

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The axial compression ratio has a significant effect on the strength and ductility of reinforced concrete (RC) columns subjected to seismic loads. However, limited numerical models have been found to be able to consider the effect of axial compression ratio in mesoscopic scale. To achieve a sound understanding of the hysteretic mechanism of RC columns with different axial compression ratios, a novel modelling method was developed by employing the following techniques: (a) the extended finite element method for modelling crack initiating and propagating in concrete; (b) the contact algorithm for modelling the crack closure; and (c) the Cartesian type "connector" for modelling the interaction between concrete and steel bars. The effectiveness of the proposed model was validated in macroscopic scale by the results of a previous experimental study. Further analysis indicates that the axial compression ratio controls the axial deformations of RC columns, thus leads to different performances of concrete and steel under seismic loads. Based on the individual flexural contributions of the concrete and the steel bars, the effect of the axial compression ratio and the pinching effect is explained in a finer scale. The analytical results shed some light on the seismic mechanism of RC columns with different axial compression ratios. KEYWORDS axial compression ratio, extended finite element method, hysteretic loop, reinforced concrete column, seismicity XFEM to model the effect of different axial compression on the hysteretic behaviour of the flexure-dominant RC columns. Struct Design Tall Spec Build. 2018;27:e1465. https://doi.

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Section: The Proposed Model In Simulationsupporting

confidence: 73%

Using XFEM to model the effect of different axial compression on the hysteretic behaviour of the flexure‐dominant RC columns

Zhan

et al. 2018

Structural Design Tall Build

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“…Yu et al explained the pinching effect in the hysteresis curves followed by cracking of concrete and yielding of rebars. In this regard, pinching effect is described by the reduced stiffness during unloading stage in the hysteresis graphs.…”

Section: Test Resultsmentioning

confidence: 99%

Full‐scale experimental assessment of new connection for columns in vertically mixed structures

Bahri

Kafi

Kheyroddin

2019

Structural Design Tall Build

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Summary More stiffness of concrete frames on one hand and fewer weight of steel frames on the other hand motivates using a composite system so called vertically mixed structures. The reinforced concrete and steel frames are connected together at a story called transition story. A major challenge for the designers is the connection columns in the transition story for proper transferring of efforts and preventing stress concentration phenomenon. There are some suggestions, in the literature, to build a transition composite column instead of constructing a local connection. Four full‐scale specimens of three connection types are constructed and tested experimentally under cyclic load to investigate hysteresis characteristics, failure mechanism, deformability, and energy dissipation capacity of the model. A novel through bolt lap connection adapted from concrete‐filled tube (CFT) column is proposed. Finally, backbone curves of proposed column for more accurate seismic studies are presented. No evident sign of local failure is observed in the proposed connection. Placing the steel around the reinforced concrete column section prepares the maximum possible geometrical dimensions for the steel column section and the connection. The experimental results show no strength loss for the new proposed connection under two different axial loads in lateral cyclic loading up to 4% drift.

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“…Even if more complex and more computationally demanding, the FEB 2 model is still an appealing and simply-to-model alternative for FE analyses with reduced effort with respect to more complex approaches (e.g., Stavridis and Shing, 2010;Yu et al, 2016).…”

Section: Comparison Between Numerical and Experimental Resultsmentioning

confidence: 99%

“…In the study proposed by Yu et al (2016), the simulation of the pinching effect characterizing the flexural cyclic response of a RC column, was conducted providing a novel modeling approach, developed through combination of the XFEM, to detect the crack paths in concrete, traction-separation cohesive laws to simulate the post-cracking response, and contact elements to take into account the clack closure process. A satisfactory simulation of the experimental response of RC frame members was obtained and the comparison between experimental and numerical hysteretic loops demonstrated the high reliability of the model in simulating the pinching effect.…”

Section: The Discrete Cracking Approachmentioning

confidence: 99%

“…Furthermore, when dealing with the cyclic behavior of the concrete members, the effects of the cyclic opening and closure of the cracks should be considered in the numerical simulation; in the smeared cracking approaches, this leads to a significant increase of the complexity of the mechanical model (Koutromanos and Shing, 2012;Redmond et al, 2018), while the eXtended Finite Element Method (XFEM) requires the definition of a contact law along the cracking surfaces, which is not predefined in the geometrical model (Yu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Micro-Modeling Approach for the Analysis of the Cyclic Behavior of RC Frames

Blasi

Luca

Aiello

2018

Front. Built Environ.

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The present study is aimed at developing a hybrid approach to consider the effect of concrete cracking on the hysteretic response of RC frames. The mechanical behavior of the concrete is defined according to the smeared cracking approach, while discrete cracking surfaces are included in the geometrical model. The interface behavior of the discrete cracking surfaces is defined by the combination of contact and cohesive elements. The proposed approach is adopted in ABAQUS to simulate an experimental test on a double cantilever column for the calibration of the numerical model. Therefore, a test conducted on a RC portal and modeled numerically for the first time is simulated. Numerical and experimental results are compared in terms of hysteretic forcedisplacement behavior and cumulative dissipated energy, in order to assess the reliability of the proposed model in simulating the energy dissipation capacity of RC members subjected to lateral cyclic loading. The hybrid modeling approach proposed allows an accurate description of the stress distribution and a fairly satisfactory matching of the hysteretic behavior with a reasonable compromise in terms of computational effort.

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New Extended Finite Element Method for Pinching Effect in Reinforced Concrete Columns

Cited by 20 publications

References 17 publications

Using XFEM to model the effect of different axial compression on the hysteretic behaviour of the flexure‐dominant RC columns

Using XFEM to model the effect of different axial compression on the hysteretic behaviour of the flexure‐dominant RC columns

Full‐scale experimental assessment of new connection for columns in vertically mixed structures

Hybrid Micro-Modeling Approach for the Analysis of the Cyclic Behavior of RC Frames

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