Experimental Study of Seismic Behavior of High-Strength RC Columns Strengthened with CFRP Subjected to Cyclic Loading

Wang, Jizhong; Yang, Junlong; Lü, Cheng

doi:10.1061/(asce)st.1943-541x.0002251

Cited by 34 publications

(13 citation statements)

References 18 publications

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“…Point C is obtained by the intersection of extended line OB and the horizontal line at the peak load, where point B is the intersection point of the tangent line (OA) of the envelope load–slip curve at original and the vertical line through point A. The ultimate slip was defined as the slip occurring when the load decreased to 85% of the peak load (Wang et al, 2019). The ultimate slip and the ductility coefficient (ratio of the ultimate slip to the yield slip) of S45-P10-C50u are absent because measurement failure at the end of the test prevented the recording of this slip value.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation on the cyclic performance of perfobond rib shear connectors

Liao

et al. 2020

Advances in Structural Engineering

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The behavior of perfobond rib shear connectors (PBL shear connectors) under monotonic loading has been widely studied. However, the performance of these connectors under cyclic loading is poorly understood and has seldom been investigated. This work presents an experimental study focusing on the cyclic performance of representative PBL shear connectors with passing rebar. Optical fibers were introduced to measure the detailed strain distributions. Results showed that the bearing capacity of these connectors could reduce up to 55.04% when compared with that under monotonic loading. The performance of these connectors differed significantly between the pull and push directions in the cyclic loading process. The concrete cracks, relative slip, and strains were developed earlier and more completely under pull than under push. Furthermore, rapid stiffness degradation, severe cracking and deformation of the concrete dowels were revealed, indicating the rapid failure of the adhesive effect, reduction of both the shear-friction effect and the dowel action of the passing rebars. These factors all contributed to the observed significant cyclic deterioration of the peak load and the slip. Based on this, a modified formula was proposed to consider the reduction effect. Comparisons between the analytical solution and test results validated the formula.

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Section: Resultsmentioning

confidence: 99%

Experimental investigation on the cyclic performance of perfobond rib shear connectors

Liao

et al. 2020

Advances in Structural Engineering

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“…The authors concluded that at the same volumetric ratio, retrofitting with CFRP straps is a superior strategy compared to the wrapping of columns with full CFRP sheets. In a similar study, Wang et al [49] studied the effectiveness of CFRP strap strengthening and full CFRP wrapping in improving the seismic performance of high-strength RC columns. However, in contrast to the previous study, it was found that full CFRP wrapping over the length of the column produces better results in terms of strength and ductility compared to wrapping in straps over the length.…”

Section: Cfrp Strengtheningmentioning

confidence: 99%

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

et al. 2019

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Sustainability necessitates the protection of infrastructure from any kind of deterioration over the life cycle of the asset. Deterioration in the capacity of reinforced concrete (RC) infrastructure (e.g., bridges, buildings, etc.) may result from localised damage sustained during extreme loading scenarios, such as earthquakes, hurricanes or tsunamis. In addition, factors such as the corrosion of rebars or ageing may also deteriorate or degrade the capacity of an RC column, thereby necessitating immediate strengthening to either extend or ensure its design life is not limited. The aim of this paper is to provide a state-of-the-art review of various strengthening and repair methods for RC columns proposed by different researchers in the last two decades. The scope of this review paper is limited to jacketing techniques for strengthening and/or repairing both normal- and high-strength RC columns. The paper also identifies potential research gaps and outlines the future direction of research into the strengthening and repair of RC columns.

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“…Wang et al [2] studied 8 columns jacketed using CFRP to investigate the effect of high-strength concrete on the enhanced element, and the results were conducted at high and low axial forces. Castillo et al [3] used anchors to fix FRP sheets and tested their capacity under cyclic lateral loads.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation for Moment-Curvature Relationship of CFRP Jacketed RC Columns

Olabi¹,

Çağlar²,

Köroğlu³

2020

Academic Platform Journal of Engineering and Science

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External jacketing of columns with Carbon Fiber Reinforced Polymer (CFRP) sheets is one of the most commonly used techniques to strengthen the existing reinforced concrete (RC) columns subjected to earthquake loads. In this paper, a parametric study is performed to examine the effects of CFRP jacketing, axial load levels and concrete quality on the total response of the CFRP jacketed RC columns. The newly computer code was developed to determine moment-curvature relationships of CFRP jacketed RC columns. Moment curvature analysis is carried out using three column sections with a fixed reinforcement ratio and three different concrete qualities, and also three different thicknesses of the CFRP wraps. The performance of jacketed RC columns in terms of ductility, strength, stiffness and energy dissipation is investigated. The results of the parametric study showed that strengthening RC columns with CFRP wraps has a significant effect on the total response of jacketed columns due to the confinement of concrete. However, the degree of enhancement in total response is also related to axial load levels.

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Experimental Study of Seismic Behavior of High-Strength RC Columns Strengthened with CFRP Subjected to Cyclic Loading

Cited by 34 publications

References 18 publications

Experimental investigation on the cyclic performance of perfobond rib shear connectors

Experimental investigation on the cyclic performance of perfobond rib shear connectors

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

Numerical Investigation for Moment-Curvature Relationship of CFRP Jacketed RC Columns

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