Numerical Study on CFRP Strengthening of Reinforced Concrete Frames with Masonry Infill Walls

Akın, Emre; Özcebe, Güney; Canbay, Erdem; Binici, Barış

doi:10.1061/(asce)cc.1943-5614.0000426

Cited by 17 publications

(4 citation statements)

References 10 publications

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“…Yet, they calibrated the strut model in order to fit the experimental results with the results of pushover analyses for three half-scale single-bay, single-story FRP-retrofitted masonry-infilled frames. In the study of Akin et al (2014) an extensive numerical study on FRP-strengthened masonry-infilled RC frames was conducted using again the same modeling concept, where the stress-strain law for the FRP-ties was the one initially presented by Binici and Ozcebe (2006). The results of pushover analyses were compared with experimental results of three single-bay, two-story (1/3 scaled) FRPretrofitted infilled frames, yielding good agreement.…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

2015

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Abstract:The present paper proposes an analytical approach for modeling the behavior of textilereinforced mortar (TRM)-strengthened masonry-infilled reinforced concrete (RC) frames under seismic loading. The model falls into the discrete diagonal-element type and is based on the use of single-strut and single-tie elements to represent the infill panel. It builds on the results of past experimental studies by the authors in which the application of TRM jacketing was proved to be effective for the seismic retrofitting of masonry infilled RC frames. The model is implemented in the non-linear finite element code Opensees, with the parameters of the diagonal elements being determined from a series of tests on TRM coupons and masonry specimens. Finally, the results of the numerical analyses are compared with the experimental data of cyclic tests on three-story masonry infilled RC frames, as-build and after retrofitting.It is shown that the model developed herein adequately accounts for the TRM-strengthening contribution to the global response of masonry infilled frames.

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Section: Introductionmentioning

confidence: 99%

Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

2015

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“…The axial tensile behavior of lapped longitudinal bars was predicted by using the effective steel stress approach proposed by Binici and Mosalam (2007). The details of this model were explained in the previous articles for 1/3-scaled test specimens (Akın et al 2011;Akın et al 2014). The model was originally developed for deformed bars and thus takes slip deformations of deformed bars into account.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Scale Effect on CFRP Strengthening of Infilled Reinforced Concrete Frames

Akın

Canbay

Binici

et al. 2015

ACT

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The diagonal application of Carbon Fiber-Reinforced Polymer fabrics on hollow clay tile infill walls has been qualified as an efficient rehabilitation method for deficient reinforced concrete frames. However, majority of the experimental studies were conducted on 1/3-scaled RC frames and the effect of specimen scaling has not been questioned. In the current study, the results of an experimental campaign on 1/2-scaled RC frames are presented. Test specimens are grouped in two series having two different aspect ratios. In each series, there are two RC frames having hollow clay tile infill walls with/without CFRP reinforcement. The results of 1/2-scaled specimens are compared with the experimental results obtained from 1/3-scaled frames. In addition, the numerical model which were developed by the authors for 1/3-scaled frames are employed for modeling 1/2-scaled specimens and the results were assessed by comparing with the test results.

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“…These experimental studies indicated that the reasonable FRP retrofitting schemes could significantly enhance the overall structural seismic performance by preventing the brittle failure and out-of-plane instability of infill walls, changing the load transfer path between infills and RC frame, reducing the damage to the joint core regions, and improving the seismic resistance of beams and columns. Also, other few studies have been conducted on the seismic investigation of FRP-retrofitted multi-story infilled RC frames (Akin et al, 2014; Binici et al, 2007; El-Sokkary and Galal, 2009; Erdem and Akyuz, 2010). Although the above studies validated the feasibility and efficiency of FRP retrofitting of infilled RC frames, these investigations mainly concentrated on one- or two-story frames, and the variety of retrofit techniques was rather limited.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling and seismic evaluation of masonry-infilled reinforced concrete frames retrofitted with carbon fiber–reinforced polymer wraps

Pan

Yan

Wang

et al. 2018

Advances in Structural Engineering

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This article investigates the efficiency of various retrofitting schemes using carbon fiber-reinforced polymers in improving the seismic performance of a substandard masonry-infilled reinforced concrete frame. One virtual five-story reinforced concrete frame was designed according to out-of-date Chinese codes. In total, 15 carbon fiber-reinforced polymers retrofitting schemes were adopted before earthquakes, and three sets of earthquakes representing low, medium, and high frequency contents were selected to conduct the incremental dynamic analysis. The influence of infills' collapse due to out-of-plane effect was discussed detailedly, and then, the effectiveness of different retrofitting schemes was evaluated. It was found that the collapse of infills obviously reduced the seismic capacity and finally resulted in a soft-story failure mechanism for the reinforced concrete frame. For earthquakes with low frequency content, the enhancement efficiency of retrofitting infills or both columns and infills was increased with the increase in the number of retrofitted stories; however, for medium and high earthquake frequency contents, retrofitting infills or both columns and infills were inefficient when less than half of the structure height was retrofitted. Among the adopted 15 schemes, carbon fiber-reinforced polymers retrofit of both columns and infills along the full building height was found to be the most efficient. Improper selection of a retrofitting scheme could lead to the change of soft-story location. The inter-story drift ratio capacity of effectively retrofitted frames can meet the requirements of current seismic code.

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Numerical Study on CFRP Strengthening of Reinforced Concrete Frames with Masonry Infill Walls

Cited by 17 publications

References 10 publications

Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

Analytical Modeling of Masonry-Infilled RC Frames Retrofitted with Textile-Reinforced Mortar

Scale Effect on CFRP Strengthening of Infilled Reinforced Concrete Frames

Numerical modeling and seismic evaluation of masonry-infilled reinforced concrete frames retrofitted with carbon fiber–reinforced polymer wraps

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