Strut-and-tie model for interior RC beam-column joints with substandard details retrofitted with CFRP jackets

Okahashi, Yasuteru; Pantelides, Chris P.

doi:10.1016/j.compstruct.2017.01.004

Cited by 15 publications

(4 citation statements)

References 21 publications

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“…Premature delimitation of FRP bonding area in between FRP and concrete is reduced by anchorage system [32]. Alternative modelling for the assessment of seismic retrofitting of joints are to be analysed by STM model [33]. Concrete surface grooving is the method to enhance the bonding of externally reinforced FRP technique [34].…”

Section: Frp System For Beam Column Jointsmentioning

confidence: 99%

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Komma¹,

Nerella²,

Madduru³

2019

RCMA

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Strengthening of reinforced concrete structures is given top priority in construction sector across the world. Ageing and load pattern changes will affect the stability of structure may be reduced. In this case, Fibre-Reinforced Polymer (FRP) materials are recognized as vital constituents to solve stability issues of the modern concrete structures. The purpose of present constructive studies of various techniques for FRP retrofit concrete structures because, the FRP material has improves the structural performance in terms of stability, stiffness, strength and durability such that the Fibre-Reinforced Polymers wrapping is one of the techniques to regain the strength of a concrete structures. By various researchers the different wrappings techniques are used to regain the strength and also enhanced the durability of the structure. This paper focuses mainly on various wrapping techniques of FRP sheets for external strengthening of RC structures such as reinforced circular columns, square beams, columns and column-beam joints.

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Section: Frp System For Beam Column Jointsmentioning

confidence: 99%

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Komma¹,

Nerella²,

Madduru³

2019

RCMA

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“…Okahashi and Pantelides [31] compared a detailed interior beam-column joint reinforced with FRP sheets or strips to an expanded strut-and-tie model of the exterior and interior RC beam-column connections. However, the technique for adding the tensile strength of FRP and its contribution to the joint's shear strength and diagonal compression strength is not well defined.…”

Section: Introductionmentioning

confidence: 99%

Development of an Analytical Model for the FRP Retrofitted Deficient Interior Reinforced Concrete Beam-Column Joints

et al. 2022

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Beam-column joints (BCJs) constructed until the 1970s carry a low shear capability due to the absence of shear reinforcement. Fiber-reinforced polymers (FRP) are more reliable than other materials to strengthen a weak BCJ. To date, plenty of analytical models have been developed to analyze the actual contribution of the FRP to the shear strength of RC BCJs. However, the models developed are either too complex in computational efforts or based on empirical coefficients that result in compromised results. The models that formulate the contribution of FRP to the shear strength of the FRP-strengthened deficient interior BCJ are very limited, and such models are too complex. An adequate BCJs’ FRP strain equation must still be developed to address these issues. Therefore, the FRP effective strain equation and contribution of FRP to RC BCJs are derived in this research work using an updated database of the appropriate BCJs. The initial analytical model of Bousselham, which Del Vecchio later improved, is further extended to FRP-strengthened deficient interior BCJs. For this purpose, an updated database of the 32 tests around the world of FRP-strengthened interior BCJs deficient in seismic reinforcement is prepared. Firstly, the experimental effective FRP strain is derived using the experimental database. Then, a power-type equation is derived for the effective FRP strain by considering the crucial parameters of the FRP-strengthened interior BCJs. Finally, the experimental shear strengths and those determined with the proposed equation of the FRP-strengthened joints are compared. The average ratio between the experimental and analytical (proposed model) joint shear strengths of the considered specimens ensured the accuracy of the suggested model. The suggested approach makes computing the FRP enhancements required to avoid shear failure in interior joints easy and reliable for researchers and field engineers interested in seismically reinforcing existing structures.

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“…e softened strut and tie model (SSTM) for determining the shear strengths of RC members failing in diagonal compressions was proposed by Hwang and Lee, which originated from the strut and tie concept, considered the compression softening characteristics of concrete, and was derived to satisfy equilibrium, compatibility, and constitutive laws of cracked reinforced concrete [14][15][16][17][18][19]. e SSTM has been used in shear strength prediction of various kinds of concrete members and the accuracy has been checked by comparing calculated shear strengths with experimental data reported in the previous literature [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Shear Strength Prediction for SFRC Shear Wall with CFST Columns by Softened Strut and Tie Model

You

Song

Zhang³

et al. 2020

Advances in Civil Engineering

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The steel fiber reinforced concrete (SFRC) shear wall with concrete filled steel tube (CFST) columns is an innovative composite structure. In order to calculate the shear strength of SFRC shear wall with CFST columns, the softened strut and tie model (SSTM) of SFRC shear wall with CFST columns was proposed based on the analysis of shear mechanism of SFRC shear wall with CFST columns. The SSTM was composed of diagonal, horizontal, and vertical mechanisms, in which the contributions of concrete, reinforcement, and steel fiber to the shear strength of SFRC web of shear wall were identified. The shear capacities of 24 shear walls were calculated and compared with the available test results, and reasonable agreement was obtained. The results also showed that the steel fibers distributed randomly in concrete could be treated as longitudinal and transverse reinforcement in the shear strength analysis of SFRC web, and the SSTM was reasonable and useful to analyze and predict the shear strength of SFRC shear wall with CFST columns.

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Strut-and-tie model for interior RC beam-column joints with substandard details retrofitted with CFRP jackets

Cited by 15 publications

References 21 publications

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Development of an Analytical Model for the FRP Retrofitted Deficient Interior Reinforced Concrete Beam-Column Joints

Shear Strength Prediction for SFRC Shear Wall with CFST Columns by Softened Strut and Tie Model

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