Retrofitting of interior RC beam–column joints using CFRP strengthened SHCC: Cast-in-place solution

Esmaeeli, Esmaeel; Barros, Joaquim A. O.; Sena-Cruz, José; Fasan, Luca; Prizzi, Fabio Raimondo Li; Melo, José; Varum, Humberto

doi:10.1016/j.compstruct.2014.12.012

Cited by 55 publications

(14 citation statements)

References 9 publications

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“…However, beyond this point the rate of the strength degradation, due to the sliding of the longitudinal rebars of the beams, has increased. Adopting a balanced energy approach discussed in [23], the equivalent bilinear perfectly elastoplastic curves of the storey-shear versus drift-angles for both specimens were determined. Using the obtained bilinear curve, the displacement ductility factor for each specimen was calculated as the ratio of the ultimate displacement to the yield displacement.…”

Section: Comparison and Discussion Of The Test Resultsmentioning

confidence: 99%

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A combination of GFRP sheets and steel cage for seismic strengthening of shear-deficient corner RC beam-column joints

Esmaeeli

Danesh

Tee

et al. 2017

Composite Structures

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This paper is focused on the performance of a proposed scheme for seismic strengthening of shear deficient joints of 3D reinforced concrete (RC) corner beam-column connections. This technique is composed of a combination of GFRP sheets and a steel cage, and does not require perforating the existing concrete elements to anchor the FRP sheets. Two similar full-scale beam-column connections were made without any transverse reinforcement in their joint region. One of which was tested in its as-built condition, taken as control specimen, while the other one was tested after strengthening. Seismic behaviour of these specimens were studied under a cyclic loading pattern imposed simultaneously with a constant column's axial load. Comparison of the test results of these specimens revealed a noticeable improvement in the seismic response of the strengthened specimen. This achievement along with the application feasibility of this technique indicates the suitability of the proposed strengthening scheme for practical applications. Finally, the experimentally obtained joint shear strength of the control and retrofitted specimens are compared to the one estimated by the relationships of the softened strut-and-tie model and ACI-318, respectively. This comparison revealed a satisfactory prediction of joint shear strength for both specimens, the as-built and the strengthened one.

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Section: Comparison and Discussion Of The Test Resultsmentioning

confidence: 99%

“…HCP can be attached to the substrate using mechanical anchors, since SHCC offers sufficient bearing capacity [21]. Both solutions, cast-in-place and HCP, showed noticeable improvements in the seismic performance of repaired severely damaged two-dimensional interior RC beam column joints [22,23].…”

Section: Introductionmentioning

confidence: 99%

A combination of GFRP sheets and steel cage for seismic strengthening of shear-deficient corner RC beam-column joints

Esmaeeli

Danesh

Tee

et al. 2017

Composite Structures

Self Cite

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“…Considerable amount of experimental and analytical studies have been carried out to investigate the seismic performance of RC beam-column joints subjected to lateral earthquake loading (Elsouri and Harajli (2013), Lee et al (2009), Masi et al (2013) and Sasmal et al (2013)) or development of retrofitting techniques for vulnerable existing RC beam column joints (Eslami and Ronagh (2014), Esmaeeli et al (2014), Vecchio et al (2016), Shwan and Abdul Razak (2016), Esmaeeli et al (2015) and Campione et al (2015)). Some of these researches were concentrated on shear resistance and behavior of RC beam-column joints.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Reinforced Concrete Beam-Column Connections with Governing Joint Shear Failure Mode

Najafgholipour

Dehghan

Dooshabi

et al. 2017

Lat. Am. j. solids struct.

112

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Reinforced concrete (RC) beam-column connections especially those without transverse reinforcement in joint region can exhibit brittle behavior when intensive damage is concentrated in the joint region during an earthquake event. Brittle behavior in the joint region can compromise the ductile design philosophy and the expected overall performance of structure when subjected to seismic loading. Considering the importance of joint shear failure influences on strength, ductility and stability of RC moment resisting frames, a finite element modeling which focuses on joint shear behavior is presented in this article. Nonlinear finite element analysis (FEA) of RC beam-column connections is performed in order to investigate the joint shear failure mode in terms of joint shear capacity, deformations and cracking pattern. A 3D finite element model capable of appropriately modeling the concrete stress-strain behavior, tensile cracking and compressive damage of concrete and indirect modeling of steel-concrete bond is used. In order to define nonlinear behavior of concrete material, the concrete damage plasticity is applied to the numerical model as a distributed plasticity over the whole geometry. Finite element model is then verified against experimental results of two non-ductile beam-column connections (one exterior and one interior) which are vulnerable to joint shear failure. The comparison between experimental and numerical results indicates that the FE model is able to simulate the performance of the beam-column connections and is able to capture the joint shear failure in RC beam-column connections.

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“…During earthquake, failure frequently occurs in joint, which is the main component for transferring load and providing stability to the structure. Moreover, the structures that follow the seismic codes in designing are also prone to damage during earthquakes (Esmaeeli et al, 2015). Beam–column joint design is complicated and remains as a challenge for structural engineers (Vaghani et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Development of finite element model for embedded carbon fiber–reinforced polymer rod in reinforced concrete frame joints

Basim

Hejazi

Rashid

et al. 2020

International Journal of Protective Structures

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The stiffness and strength of joints are the main factors in providing stability and ductility of a structure during dynamic load such as earthquake. In the high-humidity areas, the reinforcement is exposed to corrosion, which commonly occurs in the joints, due to the presence of micro-cracks in the joints, shrinkage or other concrete casting issues. Therefore, one of the main failure mechanisms of building during an earthquake is caused by damage in the joints in humid areas. This is mainly caused by corroded steel reinforcement, which reduces functionality of the frame joints in transferring the loads. This study proposes a new design for reinforced beam–column joints with embedded carbon fiber–reinforced polymer rods, which possesses extremely high strength and resistance against corrosion and high stiffness. The finite element model for embedded carbon fiber–reinforced polymer in the joints was developed in order to evaluate the performance of the proposed joints during earthquake execution. The developed program was verified through an experimental test on reinforced concrete frame subjected to vibration using dynamic actuator. The finite element program was implemented for one-story reinforced concrete frame and two-story frame building with proposed joints and seismic analysis. The results demonstrated a significant improvement in the performance of the frames reinforced with embedded carbon fiber–reinforced polymer in joints in terms of lateral load resistance capacity and failure mechanism.

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Retrofitting of interior RC beam–column joints using CFRP strengthened SHCC: Cast-in-place solution

Cited by 55 publications

References 9 publications

A combination of GFRP sheets and steel cage for seismic strengthening of shear-deficient corner RC beam-column joints

A combination of GFRP sheets and steel cage for seismic strengthening of shear-deficient corner RC beam-column joints

Finite Element Analysis of Reinforced Concrete Beam-Column Connections with Governing Joint Shear Failure Mode

Development of finite element model for embedded carbon fiber–reinforced polymer rod in reinforced concrete frame joints

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