Study of Seismic Behavior of RC Beam‐Column Joints Strengthened by Sprayed FRP

Zhao, Yongjun; Liu, Yong; Li, Jiajia

doi:10.1155/2018/3581458

Cited by 10 publications

(8 citation statements)

References 18 publications

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“…e test result obtained here is totally different from the result obtained by Yang et al [13], in which ductility decreases with an increase in axial load ratio. e axial load value can influence the damage evolution and, as a result, the deformation capacity of beam-column joints.…”

Section: Introductioncontrasting

confidence: 99%

Numerical Investigation of Textile Reinforced Cement Structural Stay‐in‐Place Formwork Designed as Beam‐Column Joint Shear Reinforcement

Desta

Getachew

Geresu

2022

Advances in Civil Engineering

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This study investigates the feasibility and structural performance of textile reinforced cement (TRC) stay-in-place (SiP) formwork designed as shear reinforcement for beam-column joints under monotonic loading through the nonlinear finite element package ABAQUS. This was achieved by conducting numerical analysis on 24 beam-column joints using different parameters that affect the joints’ performance, including column axial load ratio, concrete compressive strength, beam tensile reinforcement ratio, joint shear reinforcement ratio, and thickness of TRC. The models were first calibrated to the results obtained from the experimental program of previous studies. The start of the yielding behavior of the composite beam-column (73 kN) corresponds well to the conventional beam-column joint (72 kN). A similar correlation can be observed at the ultimate load with only a 3.7% difference, 84 kN in the case of the composite beam-column joint and 81 kN in the case of the conventional beam-column joint. The findings of this investigation showed that a beam-column with a full steel stirrup and TRC SiP formwork as shear reinforcement at the joint exhibits similar yielding behavior, such that TRC SiP formwork can replace the full steel stirrup at the joint, as proved by comparison analysis. Furthermore, the numerical analysis results due to the effect of these essential parameters on the structural performance of the beam-column with TRC SiP formwork at the joint were also discussed.

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Section: Introductioncontrasting

confidence: 99%

Numerical Investigation of Textile Reinforced Cement Structural Stay‐in‐Place Formwork Designed as Beam‐Column Joint Shear Reinforcement

Desta

Getachew

Geresu

2022

Advances in Civil Engineering

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“…Increases in the axial compression ratio below a particular value can greatly improve the bearing capacity and initial stiffness of RC beam-column joints. However, deformation capacity and flexibility will be reduced 36 . Vertical redirection of the tip of the column was noted down directly by the linear variable displacement transducer (LVDT) worked in the actuator.…”

Section: Experimental Investigationmentioning

confidence: 99%

Experimental investigation on the effect of nano-silica on reinforced concrete Beam-column connection subjected to Cyclic Loading

Shyamala,

Hemalatha,

Devarajan

et al. 2023

Sci Rep

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Beam-column joints are crucial load transmission zones because they face concentrated forces from both the beams and the columns. High shear and axial stresses caused by these concentrated forces in the area of the joint may result in decreased joint strength. This article proposes a new beam-to-column connection developed for precast concrete-resisting frames. Concrete mixtures are enhanced mechanically by adding nano silica as it increases compressive strength, flexural strength, and abrasion resistance. Within the concrete, it creates a solid, gel-like matrix that fills voids and strengthens the whole construction. In this study, three reinforced concrete beam-column joint specimens were cast with fly ash, the other three with nano-silica and fly ash, and one sample with nano-silica and a control mix without admixtures was cast. Specimen cast using fly ash and nano-silica is subjected to cyclic loading after 28 days of curing. A load capacity of 100 kN was imposed on the column during testing. It was observed that a gradual increase in fly ash decreased the compressive and flexural strength of the beam-column joints. This decrease in strength was addressed by adding 2.5% nano-silica. Nano silica acts as a nucleus to bond tightly with cement particles during hydration. The results showed that the flexural strength equivalent to that of a controlled specimen can be achieved by adding nano-silica at 2.5% and fly ash at 60%. The highest loading of 38.1 kN can be applied to the specimen with nano-silica without fly ash. Although a higher axial compression ratio can improve the bearing capacity and initial stiffness, it can also reduce deformation capacity and flexibility.

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“…Experimentally, the secant stiffness can be calculated from the cyclic load-displacement curve by calculating the slope of the straight line joining the peaks of the positive and negative cycles (Yang et al, 2018) as shown in Figure 6, which can be mathematically expressed in equation ( 1)…”

Section: Strength Secant Stiffness and Ductilitymentioning

confidence: 99%

Plastic hinge relocation in reinforced concrete beam–column joint using carbon fiber–reinforced polymer

Arowojolu

Ibrahim

Rahman

et al. 2019

Advances in Structural Engineering

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Reinforced concrete buildings with moment-resisting frames comprising beam–column joints (without joint shear reinforcement) designed prior to introduction of seismic codes are shear deficient when subjected to seismic loading, thereby mostly fail in shear at the core of the beam–column joint. However, those designed to the new seismic codes may fail by flexural hinging at the interface of the beam–column joint due to the yielding of the beam reinforcement at the location of highest stress demand (usually the beam–column joint interface). The shear failure has been precluded through the provision of transverse reinforcement at the joint in new design and the use of carbon fiber–reinforced polymer retrofitting in old buildings. Plastic hinge formation at the interface of the beam–column joint is critical because of its penetration into the joint and its effect on bond deterioration. In this study, eight corner-external beam–column joint specimens of 1/3 scale of a typical moment-resisting frame, made without transverse reinforcement, were tested for monotonic and reversed cyclic test under displacement-controlled regime. The control specimens failed by flexural hinging at the beam–column joint interface. The experimental results have been validated using the finite element model. The specimens were retrofitted with unidirectional carbon fiber–reinforced polymer of different layers and different length. After retrofitting, the plastic hinge was relocated to the curtailment end of the carbon fiber–reinforced polymer. The relocation of the plastic hinge resulted in higher load capacity and ductility.

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Study of Seismic Behavior of RC Beam‐Column Joints Strengthened by Sprayed FRP

Cited by 10 publications

References 18 publications

Numerical Investigation of Textile Reinforced Cement Structural Stay‐in‐Place Formwork Designed as Beam‐Column Joint Shear Reinforcement

Numerical Investigation of Textile Reinforced Cement Structural Stay‐in‐Place Formwork Designed as Beam‐Column Joint Shear Reinforcement

Experimental investigation on the effect of nano-silica on reinforced concrete Beam-column connection subjected to Cyclic Loading

Plastic hinge relocation in reinforced concrete beam–column joint using carbon fiber–reinforced polymer

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