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

Pantazopoulou, Stavroula J.; Tastani, S. P.; Thermou, Georgia E.; Triantafillou, Thanasis; Monti, Giorgio; Bournas, Dionysios A.; Guadagnini, Maurizio

doi:10.1002/suco.201500102

Cited by 31 publications

(37 citation statements)

References 25 publications

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“…Considering that nonlinear behavior of the retrofit is often controlled by the existing reinforcement anchorages, which may remain a weak zone of behavior even after rehabilitation, it is generally advisable that the ductility demand targeted for the structural system should not exceed the value of 2.5 [Pantazopoulou et al 2016].…”

Section: Interstorey Drift Envelopes For Retrofitting With Masonry Inmentioning

confidence: 99%

Seismic Rehabilitation of Substandard R.C. Buildings with Masonry Infills

Pardalopoulos

Pantazopoulou

Thermou

2018

Journal of Earthquake Engineering

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Seismic rehabilitation of substandard R.C. buildings with masonry infills Seismic deformation demands are localized in areas of stiffness discontinuity, such as in soft-storeys of frame structures, where disproportionate damage is often reported in post-earthquake reconnaissance. In many parts of the world this damage pattern is mitigated using strengthening schemes that include addition of stiffness in the structure so as to limit the magnitude of drift demands. A low-cost retrofitting method is the addition of masonry infills to increase the stiffness of soft storeys in low-to mid-rise reinforced concrete (R.C.) structures. This is an easily replaceable remedy in the event of damage that may prove advantageous over R.C. structural systems, owing to the lower forces imparted to the foundation in this retrofit option as compared to more thorough interventions, thereby avoiding extensively invasive retrofit operations in the foundation. Behavioural mechanisms mobilized by masonry infills in successful retrofits are shown to emulate confined masonry behaviour. It is also shown that despite their brittleness, well connected infills can successfully mitigate the occurrence of catastrophic damage by diverting damage localization from the vulnerable regions of the building. The main objective of the current paper is to present a rapid retrofit design methodology, where masonry infills are utilized for strengthening existing substandard constructions in order for their R.C. load bearing elements to behave elastically in the event of the design earthquake. To facilitate the retrofit design, practical design charts have been derived, to link drift demand to the ratios of infills' area in plan to the total plan area in the critical floor of the structure. Performance criteria, such as target distributions of interstorey drift demand, a target estimate of the fundamental period, as required by the designer, and a limit on acceptable displacement ductility in terms of demand for the retrofitted structure, are necessary design decisions that guide the proposed retrofit strategy. Application of the retrofit design through infills is demonstrated through example case studies.

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Section: Interstorey Drift Envelopes For Retrofitting With Masonry Inmentioning

confidence: 99%

Seismic Rehabilitation of Substandard R.C. Buildings with Masonry Infills

Pardalopoulos

Pantazopoulou

Thermou

2018

Journal of Earthquake Engineering

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“…For the non-circular FRP confined concrete, six stress-strain models were selected from the international codes provisions and recent literature: fib Bulletin 14 -Spoelstra and Monti (2001) [27], ACI 440 (2008) [28], CNR DT-200 (2013) [29], Biskinis and Fardis (2013) [16], Pantazopoulou et al (2016) [30] and Ghatte et al (2017) [24]. The main expressions for ultimate strength, fcu, and strain, εcu, of FRP confined concrete according to selected models are reported in Table 1 as a function of the unconfined concrete peak strength and corresponding strain, fc0 and εc0.…”

Section: Analytical Approachmentioning

confidence: 99%

Behavior of CFRP Confined Rc Columns Under Axial Load and Uniaxial Cyclic Lateral Loading

Zoppo¹,

Ludovico²,

Balsamo³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Depending on the state of the structures, it is not always possible to unload the columns by means of hydraulic jacks before applying the FRP sheets, and the intervention is often carried out under service load conditions that might induce significant modifications in the behavior of confined concrete under compression. Furthermore, so far the Design Codes provide specifications on the design retrofitting methods that allow improving the flexural, shear, and axial capacity of the concrete members but do not present design procedures able to take into account and consider the effects of existing load level on the confined compressive behavior …”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, so far the Design Codes provide specifications on the design retrofitting methods that allow improving the flexural, shear, and axial capacity of the concrete members but do not present design procedures able to take into account and consider the effects of existing load level on the confined compressive behavior. [22][23][24][25] Based on the literature review, experimental works on the preloading action are available in the case of reinforcement with concrete jackets (two of the most popular can be found in References 26 and 27), while there are very few studies in the case of confinement with FRP [28][29][30][31][32] and this matter seems to be known because of the many different points of view of the various authors.…”

mentioning

confidence: 99%

Experimental investigation on the compressive behavior of short‐term preloaded carbon fiber reinforced polymer‐confined concrete columns

Ferrotto

Fischer

Niedermeier

2017

Structural Concrete

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Strengthening of concrete columns with fiber reinforced polymer sheets provides a good improvement to the existing structural members in terms of load and strain capacity due to the properties of the composite jacket. A proper knowledge of the load–strain response of the composite members is necessary to design retrofitting intervention of existing structures; however, so far the available design methods do not allow to take into account the effect of the possible presence of service loads on the compressive behavior of the reinforced columns. An experimental investigation on the compressive behavior of preloaded circular concrete columns reinforced with carbon fiber reinforced polymer was carried out to determine the load and deformational capacity of confined concrete subjected to short‐terms loads. Nineteen compression tests were performed to underline the difference respect to the standard compressive stress–strain response of the confined specimens. The results indicate that the compressive behavior seems to be not particularly influenced by the preloading. As the preloading level increases, ultimate axial load and axial strain do not have significant change respect to the test performed without preloading; however, the load–strain response of the confined concrete is affected by a reduction of the secant stiffness.

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

Cited by 31 publications

References 25 publications

Seismic Rehabilitation of Substandard R.C. Buildings with Masonry Infills

Seismic Rehabilitation of Substandard R.C. Buildings with Masonry Infills

Behavior of CFRP Confined Rc Columns Under Axial Load and Uniaxial Cyclic Lateral Loading

Experimental investigation on the compressive behavior of short‐term preloaded carbon fiber reinforced polymer‐confined concrete columns

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