Deformation capacity of FRP retrofitted reinforced concrete columns with corroded reinforcing bars

2022 ◽  
Vol 254 ◽  
pp. 113834
Author(s):  
Kuang-Yu Dai ◽  
Xiao-Hui Yu ◽  
Kai Qian ◽  
Dai-Yu Wang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Deformation Capacity ◽  
Reinforcing Bars ◽  
Reinforced Concrete Columns

Deformation capacity of reinforced concrete columns with smooth reinforcement

2018 ◽  
Vol 17 (5) ◽  
pp. 2509-2532
Author(s):  
Eyitayo A. Opabola ◽  
Kenneth J. Elwood ◽  
Stuart Oliver
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Deformation Capacity ◽  
Reinforced Concrete Columns

scholarly journals Comparative study on acceptance criteria for non-ductile reinforced concrete columns

2018 ◽  
Vol 51 (4) ◽  
pp. 183-196
Author(s):  
Opabola Eyitayo ◽  
Kenneth J. Elwood
Keyword(s):  
Reinforced Concrete ◽  
Failure Mode ◽  
Concrete Columns ◽  
Deformation Capacity ◽  
Existing Buildings ◽  
Acceptance Criteria ◽  
Reinforced Concrete Columns ◽  
Seismic Demands ◽  
Concrete Buildings ◽  
Direct Rotation

Poor seismic performance of older reinforced concrete buildings in past seismic events has frequently been attributed to failure of non-ductile columns not detailed for seismic demands. The Seismic Assessment of Existing Buildings Guidelines developed in New Zealand (NZ Guideline) provides a performance-based engineering framework for assessment of existing buildings, with concrete buildings covered in section C5. This study compares the probable failure mode and deformation capacity assessed based on NZ Guideline, ASCE/SEI 41-13, and ASCE/SEI 41-17 with the results from quasi-static cyclic tests conducted on 52 rectangular and 13 circular reinforced concrete columns with reinforcement details similar to those of non-ductile columns. Results indicate that the general curvature-based method of the NZ Guideline was not able to identify the observed failure mode but generally provides a conservative estimate of deformation capacity in comparison with ASCE/SEI 41-17. Based on the results of this study, a direct rotation-based acceptance criteria is proposed for NZ Guidelines. Also, slight modifications, to reduce conservatism, have been proposed for the curvature-based method.

scholarly journals Behavior of Square RC Short Columns with New Arrangement of Ties Subjected to Axial Load: Experimental and Numerical Studies

2022 ◽  
Author(s):  
Hazem Elbakry ◽  
Tarek Ebeido ◽  
El-Tony M. El-Tony ◽  
Momen Ali
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Concrete Columns ◽  
Experimental Program ◽  
Transverse Reinforcement ◽  
Reinforcing Bars ◽  
Rc Columns ◽  
Reinforced Concrete Columns ◽  
Short Columns ◽  
Numerical Studies

Reinforced concrete columns consume large quantities of ties, especially inner cross-ties in columns with large dimensions. In some cases, nesting of the pillars occurs as a result of the presence of cross-ties. The main objective of this paper is to develop new methods for transverse reinforcement in RC columns and investigate their effect on the behavior of the columns. The proposed V-ties as transverse reinforcement replacing the ordinary and cross-ties details are economically feasible. They facilitate shorter construction periods and decrease materials and labor costs. For this purpose, experimental and numerical studies are carried out. In the experimental program, nine reinforced concrete columns with identical concrete dimensions and longitudinal reinforcing bars were prepared and tested under concentric axial load with different tie configurations. The main parameters were the tie configurations and the length (lv) of V-tie legs. As part of the numerical study, the finite element model using the ABAQUS software program obtained good agreement with the experimental results of specimens. A numerical parametric study was carried out to study the influence of concrete compressive strength and longitudinal reinforcement ratio on the behavior of RC columns with the considered tie configurations. Based on the experimental and numerical results, it was found that using V-tie techniques instead of traditional ties could increase the axial load capacity of columns, restrain early local buckling of the longitudinal reinforcing bars and improve the concrete core confinement of reinforced concrete columns.

scholarly journals PARAMETRIC EVALUATION OF THE PLASTIC DEFORMATION CAPACITY OF FIBER REINFORCED POLYMERS CONFINED SQUARE AND RECTANGULAR COLUMNS

2019 ◽  
Vol 13 (3) ◽  
pp. 59-63
Author(s):  
E. TORE ◽  
A. YAVAS
Keyword(s):  
Plastic Deformation ◽  
Reinforced Concrete ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Fiber Reinforced Polymers ◽  
Deformation Capacity ◽  
Fiber Reinforced ◽  
Design Guideline ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymers

Confinement with fiber reinforced polymers of reinforced concrete columns is promising retrofit solution for improving ductility of existing structure. In the study, plastic deformation capacityof fiber reinforced polymers confined square and rectangular reinforced concrete columns were parametrically evaluated. Recently released seismic strengthening recommendations of American Concrete Institute were considered for calculating plastic rotation of specified columns. Fiber reinforced polymers confined concrete model provided by the design guideline was utilized for calculating moment curvature relationship of fiber reinforced polymers confined reinforced concrete columns. Numerous sectional analysis was performed with combination of various parameters (concrete strength, axial load ratio and number of fiber reinforced polymers plies). Plastic rotations of columns were determined with plastic part of the curvature and plastic hinge length for evaluating the effects of parameters on plastic deformation capacity.

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