Comparative Analysis of Existing RC Columns Jacketed with CFRP or FRCC

Zoppo, Marta Del; Ludovico, Marco Di; Balsamo, Alberto; Prota, Andrea

doi:10.3390/polym10040361

Cited by 42 publications

(20 citation statements)

References 24 publications

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“…The lateral force-drift relationships, F-Δ, derived from the experimental tests for the three configurations investigated are reported in Figure 3, along with the damage pattern at failure. Results for C_= and C_0_FRCC were already presented in [7]. As aforementioned, the test of specimen C_0 was stopped at a drift ratio of 3.2%, to allow the repair of the specimen (Figure 3a).…”

Section: Resultsmentioning

confidence: 89%

“…Similar retrofit applications with cast in place FRCC jacketing for seismic retrofit of RC columns can be found in [7] for the repair of a full-scale column subjected to cyclic lateral load and in [8][9][10] for the confinement of scaled and full-scale columns under axial compression. In [11], prefabricated FRCC panels were used for providing external confinement to RC columns.…”

Section: Introductionmentioning

confidence: 99%

“…The specimens were subjected to a constant axial load ratio of 0.1 and an incremental lateral cyclic loading under displacements control. A further description of specimens details and test set-up can be found in[7]. The specimens were cast with a poor-quality concrete, with mean compressive strength about 15 MPa.…”

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confidence: 99%

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Flexural performance of RC columns with FRCC jacketing

et al. 2019

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A new repair technique consisting on a light jacketing with Fibre Reinforced Cementitious Composites (FRCC) for existing reinforced concrete (RC) buildings has been recently proposed to reduce durability problems of RC members and enhance their capacity. In this work, the effects of FRCC jacketing on the flexural capacity of existing RC columns, with and without a pre-damage, has been evaluated of full-scale specimens under cyclic loading. Digital Imagine Correlation (DIC) was also adopted for understanding the strain distribution in the FRCC jacket. The results shown that the FRCC jacket without a proper anchorage slightly enhanced the flexural capacity of the column. The strengthened column experienced a low damage with respect to control column, but occurrence of premature failures did not allow the achievement of high levels of deformation capacity and ductility.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Flexural performance of RC columns with FRCC jacketing

et al. 2019

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“…Several applications can be in literature about the use of HPFRCC for the jacketing of RC beams [7][8][9] and column or bridge piers [10][11][12][13], for avoiding corrosion problems, lap-splice failure or shear failure. Few studies investigated on the reliability of using strain-softening FRCC for the external jacketing [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Shear Capacity Models for Rc Columns With FRCC Jacketing

Zoppo¹,

Ludovico²,

Prota³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Existing RC buildings may suffer of brittle failure due to the limited shear capacity of nonconforming columns. To reduce the vulnerability of such members, several retrofit techniques based on composite materials can be successfully adopted for enhancing the shear capacity of RC columns. The use of Fiber Reinforced Cement Composite (FRCC) jacketing has been recently recognized as an effective solution for improving the durability of RC members and some experimental tests have been carried out for investigating the role of FRCC jacketing on the shear capacity of RC members. However, poor indications are available regarding the modelling of strengthened members capacity and the design of the strengthening solution. In this work, an in deep analysis about the available analytical models for assessing the shear capacity of members is reported and then different methods are proposed for assessing the shear capacity of RC members with FRCC jacketing.

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“…Repair strategies to restore or improve the seismic capacity of reinforced concrete (RC) components, usually seriously damaged after a strong earthquake [32][33][34][35][36][37][38][39][40][41][42][43][44], may significantly reduce the economic, social, and environmental impacts with respect to reconstruction. Repairs should be performed simply and quickly on construction sites to assure that the strategy is appropriate also in case of bridges that are strategic for the emergency response.…”

Section: Introductionmentioning

confidence: 99%

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

et al. 2018

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A new strategy that repairs severely damaged reinforced concrete (RC) columns after an earthquake is proposed as a simpler and quicker solution with respect to the strategies currently available in the literature. The external concrete parts are removed from the column surface along the whole plastic hinge region to uncover the steel reinforcement. The transverse steel is cut away, and each longitudinal rebar is locally substituted by steel rebar segments connected by welding connections to the original undamaged rebar pieces outside the intervention zone. The new rebar segments have a reduced diameter achieved by turning to ensure plastic deformation only in the plastic hinge, protecting the original rebar and the welding connections. The connection is specifically designed to be effective and simple, and is directly realized on column reinforcement. Finally, the removed concrete is restored by a jacket built with high-performance concrete with steel or polymer fibers. The use of concrete with high volume fraction of polymer fibers to repair the column is investigated for the first time in this paper. This concrete was characterized by compression and flexural tests in the laboratory and its mechanical characteristics were compared with those of the concrete with steel fibers, which are being increasingly used in construction. The repair strategy was applied to two RC columns (1:6 scaled bridge piers), tested by asymmetric cyclic tests. The results show that the column strength, stiffness, and ductility were restored, and the energy dissipation capacity improved. The experimental evidence was investigated by fiber models in OpenSees.

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Comparative Analysis of Existing RC Columns Jacketed with CFRP or FRCC

Cited by 42 publications

References 24 publications

Flexural performance of RC columns with FRCC jacketing

Flexural performance of RC columns with FRCC jacketing

Shear Capacity Models for Rc Columns With FRCC Jacketing

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

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