Effect of core compaction on deformation capacity of FRP-jacketed concrete columns

Tastani, S. P.; Balafas, Ioannis; Dervisis, A.; Pantazopoulou, Stavroula J.

doi:10.1016/j.conbuildmat.2013.05.092

Cited by 16 publications

(5 citation statements)

References 38 publications

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“…A criterion for design of the required lateral restraint to be provided by the jacket is the requirement that the strain capacity of the confined concrete ε cu,c should exceed the critical strain ε s,crit at the onset of reinforcement buckling. In this case (where ε cu,c > ε s,crit ), redistribution between the compressed bars at incipient buckling and the encased concrete is possible, thus postponing buckling to occur at a higher strain level (Tastani et al , Tastani et al ).The critical s / D b ratio that corresponds to the critical rebar stress f s,crit is given by

s/ D_{b} = ψ \sqrt{\frac{E_{t}}{f_{s,crit}}}

where E t is the tangent modulus of steel at the stress level considered (see Fig. b and fib Bulletin 24 ) and y a parameter that accounts for the buckling length ( ψ = π/4 for symmetric buckling and ψ = π/2 for lateral buckling, see Fig.…”

Section: Detailing Provisions To Eliminate Brittle Failure Of the Jacketmentioning

confidence: 99%

“…(8) and ( A criterion for design of the required lateral restraint to be provided by the jacket is the requirement that the strain capacity of the confined concrete e cu,c should exceed the critical strain e s,crit at the onset of reinforcement buckling. In this case (where e cu,c > e s,crit ), redistribution between the compressed bars at incipient buckling and the encased concrete is possible, thus postponing buckling to occur at a higher strain level (Tastani et al [23], Tastani et al [33]). The critical s/D b ratio that corresponds to the critical rebar stress f s,crit is given by…”

Section: Buckling Of Longitudinal Barsmentioning

confidence: 99%

See 1 more Smart Citation

Background to the European seismic design provisions for retrofitting RC elements using FRP materials

Pantazopoulou

Tastani

Thermou

et al. 2016

Structural Concrete

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This paper is a comprehensive background document on the state of the art in European seismic design provisions which was assembled by fib committee 5.1 to support the development of design guidelines regarding the use of externally applied fibre reinforced polymer (FRP) materials in the seismic retrofitting of reinforced concrete structures. In the context of developing design guidelines, the underlying mechanistic models that support the derivation of provisions were assembled following critical evaluation of the existing proposals and with careful reference to the experimental evidence available, the comparative assessment of past models in the literature and requirements established from first principles.

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s/ D_{b} = ψ \sqrt{\frac{E_{t}}{f_{s,crit}}}

Section: Detailing Provisions To Eliminate Brittle Failure Of the Jacketmentioning

confidence: 99%

Section: Buckling Of Longitudinal Barsmentioning

confidence: 99%

Background to the European seismic design provisions for retrofitting RC elements using FRP materials

Pantazopoulou

Tastani

Thermou

et al. 2016

Structural Concrete

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“…Numerous studies, starting with the study by Fardis and Kahalili [1] who conducted axial compressive tests on fiberglass tubes, have verified that the lateral confinement provided by FRP jackets places lateral dilated core concrete into a three-dimensional stress state, which significantly improves the axial compression and dilation behavior [2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the behavior of aramid fiber reinforced polymer confined concrete subjected to high strain-rate compression

Song

Shi

2015

Construction and Building Materials

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“…Since then, a significant amount of progress has been made that is reflected in the new Task Group 5.1 Bulletin 90 [4]. Especially Chapter 8, also presented in [5], summarizes design guidelines which are based on the comparative assessment of past models, requirements established from first principles and reference is made to the available experimental data ( [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and references therein). Alternative retrofit strategies for the seismic strengthening with composite materials are presented considering the overall response of the existing structure.…”

Section: Introductionmentioning

confidence: 99%

An Example-Guide for Rapid Seismic Assessment and FRP Strengthening of Substandard RC Buildings

Tastani

Thermou

2022

Applied Sciences

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This paper presents a rapid seismic assessment and Fibre Reinforced Polymer (FRP) retrofit design methodology which relies on the European design guidelines recently published in Chapter 8 of fib Bulletin 90 on the use of externally applied FRP reinforcement in the seismic retrofitting of reinforced concrete (r.c.) structures. For this purpose, an example-guide is developed with step-by-step hand calculations aiming to facilitate engineers of practice and researchers working in the field to easily understand the proposed methodology. A three-storey, pilotis-type residential r.c. building is selected typical of the Mediterranean construction practice in the 1970s. The methodology followed only aims to provide preliminary results on seismic assessment and retrofitting before the implementation of more sophisticated analysis if need be (e.g., in case of irregular buildings). The assessment procedure identified that the columns of the ground storey, being the most critical structural elements for the stability of the structure, are vulnerable to brittle failure modes. To remove all the brittle failure modes attributed to inherent deficiencies and enhance the overall deformation capacity of the building, the strengthening schemes applied in the ground storey (pilotis) is a combination of local strengthening measures, such as FRP wrapping, and global interventions. The latter may refer to the addition of r.c. jacketing to the central column to remove slenderness and of metal X-braces to modify the lateral deflection shape of the building and thus moderate the interstorey displacement demand.

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Effect of core compaction on deformation capacity of FRP-jacketed concrete columns

Cited by 16 publications

References 38 publications

Background to the European seismic design provisions for retrofitting RC elements using FRP materials

Background to the European seismic design provisions for retrofitting RC elements using FRP materials

Experimental investigation of the behavior of aramid fiber reinforced polymer confined concrete subjected to high strain-rate compression

An Example-Guide for Rapid Seismic Assessment and FRP Strengthening of Substandard RC Buildings

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