Numerical study of RC beams under various loading rates with LS-DYNA

The elasto-plastic characteristics of plain concrete are inevitably affected by the loading rate. This paper presents an experimental investigation on the effect of loading rate on flexural behavior of concrete and reinforced concrete (RC) beams, which was carried out with Walter+bai electro-hydraulic servo system. Three-point bending tests on 100 × 100 × 400 mm prismatic concrete samples and 80 × 120 × 1100 mm RC beams with different displacement controlled loading rates of 0.01 mm/min, 0.1 mm/min, and 3 mm/min were imposed. Based on the test results, the effects of loading rates on the load-displacement curve, cracking, and ultimate load-carrying capacities of RC beams were evaluated.

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Experimental and Numerical Study on Ultimate Shear Load Carrying Capacity of Corroded RC Beams

Advances in Civil Engineering ◽

10.1155/2021/4848483 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Zhanzhan Tang ◽

Zhixiang He ◽

Zheng Chen ◽

Lingkun Chen ◽

Hanyang Xue ◽

...

Keyword(s):

Shear Strength ◽

Bearing Capacity ◽

Cross Section ◽

Loss Rate ◽

Numerical Study ◽

Rc Beams ◽

Load Carrying ◽

Shear Bearing Capacity ◽

The Cross ◽

The Impact

For an RC beam, the strength of steel rebar, the bonding strength between the concrete and reinforcement, and the bite action between the aggregates will deteriorate significantly due to corrosion. In the present study, 10 RC beams were designed to study the impact of corrosion on the shear bearing capacity. The mechanism of corrosion for stirrups and longitudinal bars and their effects were analyzed. Based on the existing experimental data, the correlation between the stirrup corrosion factor and the cross section loss rate was obtained. An effective prediction formula on the shear bearing capacity of the corroded RC beams was proposed and validated by the experimental results. Moreover, a numerical analysis approach based on the FE technique was proposed for the prediction of the shear strength. The results show that corrosion of the reinforcements could reduce the shear strength of the RC beams. The corrosion of stirrups can be numerically simulated by the reduction of the cross section. The formulae in the literature are conservative and the predictions are very dispersed, while the predictions by the proposed formula agree very well with the experiment results.

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A numerical study on the validation of thermal formulations towards the behaviour of RC beams

Materials Today Proceedings ◽

10.1016/j.matpr.2019.06.423 ◽

2019 ◽

Vol 17 ◽

pp. 227-234

Author(s):

Mohammad Arsalan Khan ◽

Shah Irfan ◽

Zarghaam. Rizvi ◽

Jamal Ahmad

Keyword(s):

Numerical Study ◽

Rc Beams

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Modeling of CFRP strengthened RC beams using the SNSM technique, proposed as an alternative to NSM and EBR techniques

Frattura ed Integrità Strutturale ◽

10.3221/igf-esis.54.02 ◽

2020 ◽

Vol 14 (54) ◽

pp. 21-35

Author(s):

Adel Boulebd ◽

Ferhoune Noureddine ◽

Boukhezar Mohcene ◽

Habib Abdelhak Mesbah

Keyword(s):

Finite Element ◽

Failure Mode ◽

Numerical Study ◽

Concrete Cover ◽

Rc Beams ◽

Near Surface ◽

Externally Bonded ◽

Bending Capacity ◽

Near Surface Mounted ◽

Abaqus Software

In this paper, an analytical and numerical study in FEM finite element by the ABAQUS software was conducted. Which aims to study the behaviour of RC beams bending strengthened with SNSM side near surface mounted technique, proposed as a solution to avoid the failure mode by debonding of the strengthening, the disadvantage of the EBR externally bonded reinforced technique, and the failure mode by separation of the concrete cover relative to the NSM near surface mounted technique, by comparing the behaviour of the three techniques, the effect of the quantity of strengthening and confirm the results with the literature. The results of this study show that the numerical and analytical model can predict the behaviour of strengthened RC beams according to the three techniques, a clear improvement of the bending capacity of beams strengthened is noticed. A good preservation of the ductility of SNSM beams with a better failure mode.

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Influence of Longitudinal Reinforcement Ratio on Shear Strength of RC Slender Beam Under Different Loading Rates

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.897.91 ◽

2020 ◽

Vol 897 ◽

pp. 91-97

Author(s):

Halwan Alfisa Saifullah ◽

Kenichiro Nakarai ◽

Nobuhiro Chijiwa ◽

Koichi Maekawa ◽

Stefanus Kristiawan

Keyword(s):

Shear Strength ◽

Loading Rate ◽

Concrete Structures ◽

Shear Resistance ◽

Reinforcement Ratio ◽

Sustained Load ◽

Longitudinal Reinforcement ◽

Rc Beams ◽

Shear Cracks ◽

Loading Rates

. A primary current focus in concrete shear design is how to ensure the shear resistance of the concrete structures to withstand the possible adverse creep effects during the service life. All shear-carrying actions are supposed to depreciate due to the enhanced critical shear cracks under sustained loads. However, only a few studies that evaluated the performance of concrete structures failing in shear due to long-term loading. As the longitudinal tensile reinforcement strain influences the shear strength of RC beam, the shear resistance of the beam under sustained load may also be affected by the amount of longitudinal reinforcement. The present study aims at investigating the influence of flexural reinforcement ratio on the shear creep failures of reinforced concrete (RC) beams without stirrups by non-linear finite element analysis. In this study, the numerical model of RC beams with reinforcement ratios varying from 0.4% to 3.2% was evaluated under different loading rates. A loading rate of 1000 and 10000 times slower than the static loading rate were adopted to reveal the creep effects of RC beams.

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