Repair and strengthening of reinforced concrete columns with CFRPs

2010-8-17
Ozcan, Okan
Binici, Barış
Canbay, Erdem
Ozcebe, Guney
In this study, seismic retrofitting of undamaged and moderately damaged RC columns with CFRP was investigated. The experimental program was conducted on five RC columns with inadequate tie spacing, 90-degree hooks at tie ends, and plain (undeformed) reinforcing bars. Columns were tested under a constant axial load of 27% of axial capacity and under reversed lateral cyclic loading. The primary objective of this study was to investigate the influence of sustained axial load during repairing, damage, and corner-rounding radius of CFRP wraps on the seismic performance of RC columns. Improved performance in terms of ductility, dissipated energy, and secant-stiffness degradation was observed for the CFRP strengthened columns. Reducing the corner-rounding radius deteriorated the seismic behavior of the columns, while the stiffness degradation response remained unaffected. The sustained axial load during repairing had only minor effect on column behavior. After CFRP repairing, the increase in yield drift ratio and curvature was observed to be in proportion with the corresponding consumed ductility values during damage cycles. A drift-based design equation for FRP repaired columns was proposed that considers the damage amount and axial load level as the major parameters as consistent with the experimental results.
Journal of Reinforced Plastics and Composites

Suggestions

Seismic upgrading of reinforced concrete frames with structural steel elements
Özçelik, Ramazan; Binici, Barış; Department of Civil Engineering (2011)
This thesis examines the seismic internal retrofitting of existing deficient reinforced concrete (RC) structures by using structural steel members. Both experimental and numerical studies were performed. The strengthening methods utilized with the scope of this work are chevron braces, internal steel frames (ISFs), X-braces and column with shear plate. For this purpose, thirteen strengthened and two as built reference one bay one story portal frame specimens having 1/3 scales were tested under constant grav...
Seismic strengthening of rectangular reinforced concrete columns using fiber reinforced polymers
ÖZCAN, OKAN; Binici, Barış; Ozcebe, Guney (2010-04-01)
In recent years, fiber-reinforced polymers have been widely utilized to improve the seismic performance of deficient RC columns. In this study, the flexural behavior of CFRP strengthened rectangular RC columns with plain bars and insufficient confining steel was investigated Five specimens, representing a typical deficient building column with poor transverse reinforcement detailing and low concrete strength, were tested under cyclic displacement excursions and constant axial load. The beneficial effect of ...
Seismic behavior of autoclaved aerated concrete reinforced vertical panel buildings
Gökmen, Furkan; Binici, Barış; Department of Civil Engineering (2017)
In this study, the seismic behavior of Autoclaved Aerated Concrete (AAC) reinforced panel walls and buildings was investigated. The structural members were investigated under cyclic lateral loading and axial load and the results were compared with the previous tests. The main objective of this study was to provide recommendations for nonlinear analysis of the reinforced AAC panel walls and buildings. OpenSees plat-form was chosen as the computational platform. The walls were modeled with fiber sections. The...
Joint shear strength prediction for reinforced concrete beam-to-column connections
Unal, Mehmet; Burak Bakır, Burcu (2012-02-10)
In this analytical study numerous prior experimental studies on reinforced concrete beam-to-column connections subjected to cyclic loading are investigated and a database of geometric properties, material strengths, configuration details and test results of subassemblies is established. Considering previous experimental research and employing statistical correlation method, parameters affecting joint shear capacity are determined. Afterwards, an equation to predict the joint shear strength is formed based o...
Evaluation of shear wall indexes for reinforced concrete buildings
Soydaş, Ozan; Yakut, Ahmet; Department of Civil Engineering (2009)
An analytical study was carried out to evaluate shear wall indexes for low to mid-rise reinforced concrete structures. The aim of this study was to evaluate the effect of different shear wall ratios on performance of buildings to be utilized in the preliminary assessment and design stages of reinforced concrete buildings with shear walls. In order to achieve this aim, forty five 3D building models with two, five and eight storeys having different wall ratios were generated. Linearly elastic and nonlinear st...
Citation Formats
O. Ozcan, B. Binici, E. Canbay, and G. Ozcebe, “Repair and strengthening of reinforced concrete columns with CFRPs,” Journal of Reinforced Plastics and Composites, pp. 3411–3424, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28119.