Shear Strengthening of RCT-Joints Using CFRP Composites

Gergely, Janos; Pantelides, Chris P.; Reaveley, Lawrence D.

doi:10.1061/(asce)1090-0268(2000)4:2(56)

Cited by 135 publications

(43 citation statements)

References 7 publications

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“…A more rigorous model, based on stress equilibrium and strain compatibility equations of the panel zone region (idealized as a three-dimensional element) has been presented by Antonopoulos & Triantafillou (2002) as an extension of the model for RC joint behavior without FRP proposed by Pantazopoulou & Bonacci (1992). Satisfactory validation of the analytical model was obtained on the experimental results on a total of 15 beam-column exterior beam-column subassemblies, tested by the authors (Antonopoulos & Triantafillou, 2003) or available in literature (Gergely et al, 2000).…”

Section: Shear Frp Retrofit Of Jointmentioning

confidence: 91%

“…Typical over-simplified approaches consider the contribution of the FRP equivalent to external "stirrups" (analogy with steel transverse reinforcement). Upper limits of the maximum strain in the FRP material are used in the calculations, either corresponding to the declared ultimate tensile capacity (Gergely et al 1998) or to a constant strain values depending on the preparation of the concrete surface (Tsonos & Stylianidis, 1999;Gergely et al, 2000). A more rigorous model, based on stress equilibrium and strain compatibility equations of the panel zone region (idealized as a three-dimensional element) has been presented by Antonopoulos & Triantafillou (2002) as an extension of the model for RC joint behavior without FRP proposed by Pantazopoulou & Bonacci (1992).…”

Section: Shear Frp Retrofit Of Jointmentioning

confidence: 99%

See 1 more Smart Citation

Multi-level seismic rehabilitation of existing frame systems and subassemblies using FRP composites

Pampanin¹,

Bolognini²,

Pavese³

et al. 2004

FRP Composites in Civil Engineering - CICE 2004

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The feasibility and efficiency of a retrofit intervention on gravity load-designed frame systems using externally bonded FRP composites is herein presented, through both analytical and experimental investigations. A multi-level retrofit strategy is proposed to achieve the desired performance, based on hierarchy of strength considerations. The expected sequence of events can be visualized through demand-capacity curves within M-N Performance-Domains. An analytical procedure able to predict the enhanced non-linear behaviour of the panel zone region, due to the application of CFRP laminates, in terms of shear strength (principal stresses) vs. shear deformation, is developed and proposed as a fundamental step for the definition of a proper retrofit strategy. The experimental results from quasi-static tests on 2/3 scaled beam-column subassemblies (either interior and exterior) in as-built and retrofitted configuration, provided very satisfactory confirmations of the viability and reliability of the retrofit solution adopted as well as of the proposed analytical procedure.

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Section: Shear Frp Retrofit Of Jointmentioning

confidence: 91%

Section: Shear Frp Retrofit Of Jointmentioning

confidence: 99%

Multi-level seismic rehabilitation of existing frame systems and subassemblies using FRP composites

Pampanin¹,

Bolognini²,

Pavese³

et al. 2004

FRP Composites in Civil Engineering - CICE 2004

View full text Add to dashboard Cite

show abstract

“…Several FRP-strengthening materials and layouts were considered to define the benefits provided to the seismic performance of beam-column joints (e.g., Gergely et al [8], Pantelides et al [9], Gergely et al [10], Granata and Parvin [11], Ghobarah and Said [12], Pantelides et al [13] among others).…”

Section: Introductionmentioning

confidence: 99%

Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames

et al. 2015

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The beam-column joints are very restricted areas in which the internal forces, generated by boundary elements, act on the concrete core and reinforcing bars with a very high gradient. They are the link between horizontal and vertical structural elements, and therefore, they are directly involved in the transfer of seismic forces. Thus, they are crucial to study the seismic behavior of reinforced concrete (RC) structures. To fully understand the seismic performances and failure modes of beam-column joints in RC buildings, a simplified analytical model of joint behavior is proposed and theoretical simulations are performed. The aim of the model, focusing on internal perimetric joints, is to identify the strength hierarchy in terms of capacity for different failure modes (namely failure of cracked joint, bond failure of passing through bars, flexural/shear failures of columns or beams). It could represent a tool for the designers of new joints to quantify the performance of new structures, but also as a tool for the designers of external strengthening of existing joints in order to calculate the benefits of the retrofit and pushing the initial failure to a more desirable failure mode. Further, some experimental results of tests available in the scientific literature are reported, analyzed and compared.Polymers 2015, 7 1733

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“…connections referring to the joint region including the beam/s and column/s framing into the joint). Both exterior and interior connections have been tested with externally bonded FRP to enhance the connection shear capacity [1][2][3][4] or to enhance the anchorage capacity of poorly anchored longitudinal beam reinforcement. 5,6 In addition, FRP has been used to enhance both the shear strength of the connection and anchorage of the beam reinforcement 7,8 and also to relocate the formation of plastic hinging further along the beam away from the joint.…”

Section: Introductionmentioning

confidence: 99%

Strengthening RC beam–column connections with FRP strips

Shrestha

Smith²,

Samali

2009

Proceedings of the Institution of Civil Engineers - Structures

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Reinforced concrete connections, designed prior to the implementation of earthquake design standards, may be vulnerable to shear failure during a seismic attack. Addition of externally bonded fibre-reinforced polymer (FRP) composites can enhance not just the shear capacity but the deformation and energy absorption capacity of the connection. The majority of research studies to date have opted for complete or near-complete coverage of the joint region with FRP and have subjected the test specimens to cyclic (push–pull) loading. Such strengthening schemes and method of loading make it quite difficult to accurately monitor and hence understand the behaviour of the FRP and the concrete beneath. This paper presents results of a series of tests on the strengthening of shear deficient connections with FRP strips subjected to either cyclic or monotonic loading with the primary motivation being accurate description of the behaviour of the FRP. The tests also enable the failure modes to be more accurately reported and classified especially due to the use of monotonic loading. An analytical model is finally presented which accurately describes the mechanics of the FRP strengthening with the model predictions correlating reasonably well with the test data.

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Shear Strengthening of RCT-Joints Using CFRP Composites

Cited by 135 publications

References 7 publications

Multi-level seismic rehabilitation of existing frame systems and subassemblies using FRP composites

Multi-level seismic rehabilitation of existing frame systems and subassemblies using FRP composites

Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames

Strengthening RC beam–column connections with FRP strips

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