scholarly journals New configuration of transverse reinforcement for improved seismic resistance of rectangular RC columns: Concept and axial compressive behavior

2016 ◽  
Vol 111 ◽  
pp. 383-393 ◽  
Author(s):  
D.H. Jing ◽  
T. Yu ◽  
X.D. Liu
Keyword(s):  
Seismic Resistance ◽  
Transverse Reinforcement ◽  
Compressive Behavior ◽  
Rc Columns

Strengthening of RC columns with inadequate transverse reinforcement

2004 ◽  
pp. 211-218 ◽  
Author(s):  
O Peker ◽  
A Ilki ◽  
N Kumbasar ◽  
V Koc ◽  
E Karamuk
Keyword(s):  
Transverse Reinforcement ◽  
Rc Columns

Axial Performance of Various Strengthening Methods Applied on Full-Scale Rectangular RC Columns

2011 ◽  
Vol 82 ◽  
pp. 618-623 ◽  
Author(s):  
Pei Ching Chen ◽  
Min Lang Lin ◽  
Yin Han Wu
Keyword(s):  
Axial Force ◽  
Full Scale ◽  
Reinforcement Ratio ◽  
The Other ◽  
Transverse Reinforcement ◽  
Rc Columns ◽  
Different Shapes ◽  
Adhesive Anchors ◽  
Cfrp Wrapping ◽  
Better Than

The performance of RC columns subjected to axial force is relative to the confinement. CFRP wrapping, a generally adopted retrofit method, was proved not to effectively provide confining force due to the bulging effect on the column face. Therefore, this paper is focused on the performance of the retrofitted full-scale rectangular RC columns using different retrofit schemes including the proposed CFRP wrapping conjugated with CFRP anchors method. A total of eleven rectangular RC columns with low transverse reinforcement ratio were constructed. Among them, one was tested as benchmark; one was purposely constructed with larger transverse reinforcement ratio; five were retrofitted by using CFRP wrapping and CFRP anchors; and the other four were retrofitted by using different shapes of steel jacketing alone or with adhesive anchors. All the specimens were subjected to monotonic incremental axial force until failure occurred. Experimental results demonstrated that the ductility of the specimens retrofitted by using CFRP wrapping with CFRP anchors was significantly improved compared with those retrofitted by using only CFRP wrapping. On the other hand, the specimen with octagonal steel jacketing performed better than all other specimens not only on ductility but also on strength. Finally, a novel numerical model considering the contribution of the retrofit material will be proposed and validated in the future.

scholarly journals Effect of Configuration and Yield Strength of Transverse Reinforcement on Lateral Confinement of RC Columns

2021 ◽  
Vol 11 (15) ◽  
pp. 6696
Author(s):  
Min-Jun Kim ◽  
Bum-Sik Lee ◽  
Dong-Hwan Kim ◽  
Sang-Pil Han ◽  
Kil-Hee Kim
Keyword(s):  
Yield Strength ◽  
Cross Sections ◽  
Plastic Hinge ◽  
Transverse Reinforcement ◽  
Seismic Loads ◽  
Rc Columns ◽  
Lateral Confinement ◽  
Flexural Failure ◽  
Hinge Zone ◽  
Ductile Behavior

In general, the lateral confinement capacity of RC columns is influenced by the strength and configuration of transverse reinforcement. In this study, performed antisymmetric flexural moment experiments that simulated seismic loads, with the configuration and yield strength of the transverse reinforcement of RC square columns as main variables. The eight specimens were square cross-sections measuring 250 × 250 mm, and the lateral confinement effect in relation to main variables was examined by inducing flexural failure in the plastic hinge zone under a shear span-to-depth ratio (a/D) of 3.0. Transverse reinforcements comprised a square and octagonal S-series and tie-based H-series. The yield strengths of the transverse reinforcements were 453 MPa and 1053 MPa, respectively. Compared to the H-series, the S-series, whose configuration of transverse reinforcement is closer to a circular form, exhibited more prominent ductile behavior after flexural yield with increasing yield strength of transverse reinforcement, which indicates greater lateral confinement.

scholarly journals Research on Different Applications of SMA in Seismic Resistance of Building Structures

2021 ◽  
Vol 293 ◽  
pp. 02001
Author(s):  
Zhang Zhe
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Shape Memory ◽  
Base Isolation ◽  
Weight Ratio ◽  
Seismic Resistance ◽  
Power Weight ◽  
Building Structures ◽  
Rc Columns ◽  
The Relationship

SMA(Shape memory alloys) are unique materials with many excellent properties, such as excellent wear resistance, corrosion resistance, high power/weight ratio and biocompatibility, high damping, shape memory effect, super elasticity, etc. In civil engineering, scientists try to use the advantages of SMA by making it into different components and they have already made some types of components that are SMA bracing, SMA constrains RC columns, SMA ring springs and base isolation bearing. All of these components can make contributions to seismic resistance, therefore, this article mainly focuses on the the contribution of SMA bracings and SMA constrains RC columns to the seismic resistance of the structure and the relationship between the improvement of their own performance and SMA.

scholarly journals Finite Element Analysis of Square RC Columns Confined by Different Configurations of Transverse Reinforcement

2017 ◽  
Vol 11 (1) ◽  
pp. 292-302 ◽  
Author(s):  
Xiang Zeng
Keyword(s):  
Finite Element ◽  
Strain Curve ◽  
Transverse Reinforcement ◽  
Plasticity Model ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Rc Columns ◽  
Rc Structures ◽  
Concrete Damaged Plasticity ◽  
Uniaxial Compressive Stress

Introduction:Square reinforced concrete (RC) columns with the confinement effect of transverse reinforcement perform well in ductility and have been used widely in RC structures. Its behavior is the classic topic of anti-seismic and anti-collapse analysis of RC structures. With the advancement of the finite element (FE) analysis technology, the general-purpose simulation tools such as ABAQUS and ANSYS have been universally used to analyze the behavior of structures and members, where the material constitutive model is a key problem in the analysis.Methods:In this study, a new uniaxial compressive stress-strain curve of the confined concrete considering confinement effect of transverse reinforcement in square RC columns was proposed for the concrete damaged plasticity model in ABAQUS to solve the problem that there is no proper uniaxial compressive stress-strain curve for the concrete damaged plasticity model to describe the behavior of concrete confined by transverse reinforcement. Based on the proposed stress-strain relationship, a FE model was developed to analyze the behaviour of laterally confined RC columns under concentric loading.Results:The finite element model is able to predict the response of the confined RC columns from different experiments with reasonable accuracy. Finally, a parametric study was conducted in order to evaluate the effect of confinement reinforcement configuration on the behavior of core concrete in square section.

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 Confinement Effect of Reinforced Concrete Columns with Rectangular and Octagon-Shaped Spirals

2020 ◽  
Vol 12 (19) ◽  
pp. 7981
Author(s):  
Hyeong-Gook Kim ◽  
Chan-Yu Jeong ◽  
Dong-Hwan Kim ◽  
Kil-Hee Kim
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Transverse Reinforcement ◽  
Longitudinal Reinforcement ◽  
Rc Columns ◽  
Rc Column ◽  
Cyclic Lateral Load ◽  
Ductility Capacity ◽  
Constant Axial Load ◽  
Spiral Type

Conventional spiral-type transverse reinforcement is effective at increasing the ductility and the maximum strength of reinforced concrete (RC) columns because it confines the inner concrete and the longitudinal reinforcement. However, when arranging crossties in a RC column with spirals, problems such as mutual interference with longitudinal reinforcement, overcrowding of reinforcement, and deterioration of constructability occur. Furthermore, the loosening of 90 and 130-degree standard hooks due to the lateral expansion of concrete causes buckling of the longitudinal reinforcement. This paper describes the ability of a newly developed spiral-type transverse reinforcement with various yield strengths to confine RC columns subjected to cyclic lateral load and constant axial load. The ductility capacity, energy dissipation, and effective stiffness of RC columns confined by the developed spiral-type transverse reinforcement were compared with those of RC columns confined by typical rectangular reinforcement. The experimental results showed that RC column specimens with the developed spiral-type transverse reinforcement have better performances in terms of ductility capacity and energy dissipation, even though the amount of reinforcement used for the specimens decreased by about 27% compared with the specimen with typical rectangular reinforcement.

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