The effect of shape memory alloys on the ductility of exterior reinforced concrete beam-column joints using the damage plasticity model

Halahla, Abdulsamee M.; Tahnat, Yazan B. Abu; Almasri, Amin H.; Voyiadjis, George Z.

doi:10.1016/j.engstruct.2019.109676

Cited by 26 publications

(14 citation statements)

References 18 publications

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“…When using concrete plastic damage model, a set of parameters need to be determined in the modeling process to capture the mechanical behavior of concrete accurately. The default values of these parameters are taken from Halahla et al (2019) and Tahnat et al (2020), and the simulated results obtained by using these parameters were in good agreement with the experimental results. These parameters were also used in this paper, as shown in Table 3.…”

Section: Experiments Overviewsupporting

confidence: 61%

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An innovative reinforcement method: the combination of CFRP bars and UHPC layer is applied to the flexural reinforcement of RC beams

Liu

et al. 2022

MMMS

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PurposeEmbedding carbon fiber reinforced plastics (CFRP) bars in the tension zone of reinforced concrete (RC) beams is a widely used reinforcement method, which has the advantages of strong anti-peel ability and high utilization of tensile materials. To further improve the flexural bearing capacity of RC beams, a new composite reinforcement method using the UHPC layer in the compressive zone of RC beams is proposed based on embedding CFRP bars in the tension zone of RC beams.Design/methodology/approachThe finite element model of an RC experimental beam with CFRP bars embedded in the tension zone was carried out by ABAQUS. Besides, the reliability of the finite element model results was verified by comparing with the experimental results. On this basis, the flexural reinforcement effect of CFRP bars and UHPC layers on RC beams was analyzed.FindingsCalculation results show the flexural bearing capacity of the beam strengthened by the new method is 15.9%, which is higher than that of the unreinforced beam, and 10.4% higher than that of the beam strengthened only with CFRP bars. The beam ductility ratio of the new method is 8.25%, which is slightly higher than that of the unreinforced beam and equal to that of the beam reinforced only with CFRP bars embedded in the tension zone. The effectiveness of the new method is further verified by using the analytical calculation method.Originality/valueA new flexural reinforcement method for reinforced concrete beams is proposed, and the effectiveness of the method was verified by experiments and finite element model. The flexural bearing capacity and ductility of the new method were analyzed based on the load-deflection curve. Finally, the possibility of the new method was verified by analytical analysis.

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Section: Experiments Overviewsupporting

confidence: 61%

Section: Finite Element Modelmentioning

confidence: 99%

An innovative reinforcement method: the combination of CFRP bars and UHPC layer is applied to the flexural reinforcement of RC beams

Liu

et al. 2022

MMMS

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“…2020;Halahla et al, 2019) adopted these properties, and the results gained were in good agreement with the experimental tests. Properties of the plastic damage model are shown in Table2.…”

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confidence: 59%

Flexural bearing capacity of RC hollow slab beam strengthened by steel plates of different thicknesses

Liu

Wang

Xiao

2021

IJSI

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PurposeThe flexural reinforcement of bridges in-service has been an important research field for a long time. Anchoring steel plate at the bottom of beam is a simple and effective method to improve its bearing capacity. The purpose of this paper is to explore the influence of anchoring steel plates of different thicknesses on the bearing capacity of hollow slab beam and to judge its working status.Design/methodology/approachFirst, static load experiments are carried out on two in-service RC hollow slab beams; meanwhile, nonlinear finite element models are built to study the bearing capacity of them. The nonlinear material and shear slip effect of studs are considered in the models. Second, the finite element models are verified, and the numerical simulation results are in good agreement with the experimental results. Finally, the finite element models are adopted to carry out the research on the influence of different steel plate thicknesses on the flexural bearing capacity and ductility.FindingsWhen steel plates of different thicknesses are adopted to reinforce RC hollow slab beams, the bearing capacity increases with the increase of the steel plate thickness in a certain range. But when the steel plate thickness reaches a certain level, bearing capacity is no longer influenced. The displacement ductility coefficient decreases with the increase of steel plate thickness.Originality/valueBased on experimental study, this paper makes an extrapolation analysis of the bearing capacity of hollow slab beams reinforced with steel plates of different thicknesses through finite element simulation and discusses the influence on ductility. This method not only ensures the accuracy of bearing capacity evaluation but also does not need many samples, which is economical to a certain extent. The research results provide a basis for the reinforcement design of similar bridges.

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“…Various kinds of SMA-based vibration control devices, such as isolators [ 3 , 4 , 5 , 6 , 7 ] and dampers [ 8 , 9 , 10 , 11 ], have been developed by exploiting the energy dissipation capacity and recentering ability of SMAs. Development in the machining and connection technology has made it possible to use superelastic SMA bars as reinforcement materials in the construction industry, such as in beams [ 12 , 13 , 14 ], columns [ 15 , 16 ], beam–column joints [ 17 , 18 ], and shear walls [ 19 , 20 ]. SMA wires are often applied to confine the concrete cylinder [ 21 ] or retrofit the reinforced concrete column [ 22 ] for seismic application based on their unique mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties of Large Shape Memory Alloy Bars under Different Heat Treatments

et al. 2020

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Shape memory alloys (SMAs) are a class of functional materials that possess unique thermomechanical properties, such as shape memory effect (SME), superelasticity (SE), damping, and good fatigue and corrosion resistance, which enable them to become ideal materials for applications in earthquake engineering. Numerous studies have shown that the mechanical properties of superelastic SMAs mainly depend on the wire form, or the relationship between the microstructure and thermally induced phase transitions. However, extremely few studies have elucidated the effects of the heat-treatment strategy, size effect of large diameters, and cyclic loading. Herein, the mechanical properties of SMA bars, such as residual strain, energy dissipation, and equivalent damping ratio, were studied with different heat-treatment strategies, cyclic loadings, and strain amplitudes; this was achieved by conducting cyclic tensile tests on SMA bars with four different diameters. The results indicate that the maximum phase transformation stress was obtained with a 14 mm SMA bar subjected to heat treatment at 400 ℃ for 15 min. The mechanical properties were relatively stable after five loading–unloading cycles, which should be considered in engineering applications. The test results provide a mechanical basis for using large SMA bars in self-centering structures in seismic regions.

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The effect of shape memory alloys on the ductility of exterior reinforced concrete beam-column joints using the damage plasticity model

Cited by 26 publications

References 18 publications

An innovative reinforcement method: the combination of CFRP bars and UHPC layer is applied to the flexural reinforcement of RC beams

An innovative reinforcement method: the combination of CFRP bars and UHPC layer is applied to the flexural reinforcement of RC beams

Flexural bearing capacity of RC hollow slab beam strengthened by steel plates of different thicknesses

Investigation of Mechanical Properties of Large Shape Memory Alloy Bars under Different Heat Treatments

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