Transverse reinforcement for confinement at plastic hinge of circular composite hollow RC columns

2016 ◽  
Vol 17 (3) ◽  
pp. 387-406
Author(s):  
Deok Hee Won ◽  
Taek Hee Han ◽  
Seungjun Kim ◽  
Woo-Sun Park ◽  
Young Jong Kang
Keyword(s):  
Plastic Hinge ◽  
Transverse Reinforcement ◽  
Rc Columns

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.

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 CONTRIBUTION OF CONCRETE TO SHEAR STRENGTH OF RC BEAMS FAILING IN SHEAR

2013 ◽  
Vol 19 (3) ◽  
pp. 400-408 ◽  
Author(s):  
Guray Arslan ◽  
Zekeriya Polat
Keyword(s):  
Shear Strength ◽  
Shear Failure ◽  
Plastic Hinge ◽  
Transverse Reinforcement ◽  
Rc Beams ◽  
Earthquake Resistant ◽  
Earthquake Resistant Structures ◽  
Shear Failures ◽  
Beam Plastic Hinge ◽  
Shear Demand

Reinforced concrete (RC) beams with light transverse reinforcement are vulnerable to shear failure during seismic response. In order to prevent brittle shear failures at beam plastic hinge regions of earthquake-resistant structures, the Turkish Earthquake Code and ACI318 require the use of sufficient transverse reinforcement to resist the total expected shear demand. These codes tend to be excessively conservative and, in some cases, the contribution of the concrete to the shear strength is neglected. The aim of this study is to investigate the contribution of concrete to shear strength of RC beams failing in shear experimentally. The beams were tested under monotonically increasing reversed cyclic loading to determine the concrete contribution to shear strength. It is observed that the concrete contribution to the shear strength at ultimate state ranges from 18% to 69% of the ultimate strength.

Design of FRP Jackets for Plastic Hinge Confinement of RC Columns

2013 ◽  
Vol 17 (4) ◽  
pp. 433-442 ◽  
Author(s):  
Chris P. Pantelides ◽  
Domingo A. Moran
Keyword(s):  
Plastic Hinge ◽  
Rc Columns

CONFINING TRANSVERSE REINFORCEMENTS FOR CIRCULAR COMPOSITE HOLLOW RC COLUMN WITH INNER TUBE

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Deok Hee Won ◽  
Woo-Sun Park ◽  
Ji-Hye Seo ◽  
Nam-Hyung Lim ◽  
Taek Hee Han
Keyword(s):  
Calculation Method ◽  
Rational Design ◽  
Plastic Hinge ◽  
Concrete Core ◽  
Rc Columns ◽  
Displacement Ductility ◽  
Rc Column ◽  
Cover Concrete ◽  
Strength And Stiffness ◽  
Aashto Lrfd

The confining transverse reinforcement has been arranged in plastic hinge region to resist the lateral load, increasing the lateral confining effect in the substructure of the bridge. Columns increased the seismic performance by securing the stiffness and ductility. The calculation method of confining transverse reinforcements is reported in AASHTO-LRFD specification. This specification is only proposed for solid RC columns. In this reason, if this specification is applied to another column as composite column besides solid RC columns, a proper evaluation of the column cannot be done. In particular, composite hollow RC columns have limits for applying this specification. The composite hollow RC column consists of transverse longitudinal reinforcement, cover concrete, core concrete, and an inner tube inserted on hollow face. It increases the ductility, strength, and stiffness of the composite hollow RC column. This paper suggests a modified equation for an economical and rational design through an investigation of displacement ductility when applied to the existing specifications of the composite hollow RC column. Moreover, parametric study is performed for evaluating the detail behavior. Using these results, a calculation method of economic transverse reinforcements is proposed.

Axial Strain of Reinforced Concrete Columns

2010 ◽  
Vol 163-167 ◽  
pp. 1858-1861 ◽  
Author(s):  
Jong Wook Park ◽  
Sang A Cha ◽  
Ji Eun Kang ◽  
Mohamad Mansour ◽  
Jung Yoon Lee
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Axial Force ◽  
Axial Strain ◽  
Plastic Hinge ◽  
Rc Columns ◽  
Reversed Cyclic Loading ◽  
Depth Ratio ◽  
Short Span ◽  
Reversed Cyclic

The reinforced concrete members are designed to fail in flexural member to behave ductilely. Also the failure doesn’t impose on columns but beams. But according to the plastic collapse mechanism, the plastic hinge potentially developed at the bottom of the RC column near the base of the structure after flexural yielding. These columns are generally dominated by shear which led to sudden failure in post yielding region because of its relatively short span-to-depth ratio, so special care is needed. The deformability of column with short span-to-depth ratio is small compared with larger span-to-depth ratio column under reversed cyclic loading. Therefore the design of these kinds of RC columns necessitates the prediction of both the shear strength after flexural yielding and corresponding ductility of such members. Ten RC columns with varying axial force ratio and shear reinforcement ratio were tested under monotonic and reversed cyclic loading. The most affectable factor to column behavior was the axial force. The result indicates that concrete contribution to shear resistance in the plastic hinge region and axial strain were decreased as axial force.

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