Axial Compression Test of RC Columns Consolidation with BFRP

2012 ◽  
Vol 166-169 ◽  
pp. 881-884
Author(s):  
Bao Rong Huo ◽  
Xiang Dong Zhang
Keyword(s):  
Comparative Study ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Calculation Formula ◽  
Rc Columns ◽  
Displacement Ductility ◽  
Rc Column ◽  
Ductility Factor ◽  
Increase Rate ◽  
The Comparative Study

12 RC columns were made, including nine RC columns wrapped with BFRP, three RC columns without any reinforcement, to conduct the comparative study of axial compression. The result shows that the bearing capacity of the RC columns reinforced with the fibers increases obviously.The displacement ductility factor increases, but its increase rate becomes slow with increasing layers of fiber cloth, so the most economical layer number is 3. Based on the confinement mechanism of FRP cloth and the calculation formula of the bearing capacity for common RC column, the formula of the bearing capacity for reinforced RC column with BFRP cloth is proposed. The result of calculation basically tallies with the number in experiment.

Axial Compression Test and Capacity Caculation of RC Columns Consolidation with BFRP, CFRP

2011 ◽  
Vol 94-96 ◽  
pp. 481-484 ◽  
Author(s):  
Bao Rong Huo ◽  
Xiang Dong Zhang
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Calculation Formula ◽  
Rc Columns ◽  
Displacement Ductility ◽  
Rc Column ◽  
Ductility Factor ◽  
Increase Rate ◽  
The Difference ◽  
The Comparative Study

Abstract：Twenty-one RC columns were made, including nine RC columns wrapped with BFRP, nine RC columns wrapped with CFRP, three RC columns without any reinforcement, to conduct the comparative study of axial compression. The result shows that the bearing capacity of the RC columns reinforced with the fibers increases obviously. The bearing capacity of the RC columns with CFRP is higher than that with BFRP, but the difference is not obvious. The displacement ductility factor increases, but its increase rate becomes slow with increasing layers of fiber cloth, so the most economical layer number is 3. Based on the confinement mechanism of FRP cloth and the calculation formula of the bearing capacity for common RC column, the formula of the bearing capacity for reinforced RC column with BFRP cloth is proposed. The result of calculation basically tallies with the number in experiment.

Experimental Investigation for Horizontal Ultimate Bearing Capacity and Target Ductility Factor Improvement Results of the RC Column Reinforced by AFL with Damages

2014 ◽  
Vol 488-489 ◽  
pp. 497-500
Author(s):  
You Lin Zou ◽  
Pei Yan Huang
Keyword(s):  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Test Results ◽  
Rc Columns ◽  
Static Test ◽  
Rc Column ◽  
Ductility Factor ◽  
Secant Stiffness ◽  
Function Relationship ◽  
Reversed Cyclic

Deem test results from the low reversed cyclic loading quasi-static test with 2 RC columns as the basic information of secant stiffness damage of the reference column and take use of the TMS instrument in the test to artificially make the damage percentage of secant stiffness of the RC column as 33%, 50% and 66%, 6 damaged columns in total; reinforce the 6 damaged columns and 2 undamaged ones under the same conditions with AFL, through quasi-static contrast test. Test results show that it is able to effectively boost horizontal ultimate bearing capacity and ductility deformability of the RC columns with AFL for reinforcement; besides, there is a linear function relationship between horizontal ultimate bearing capacity, target ductility factor, and damage percentage of secant stiffness.

Effect of Axial Compression Ratio on Ductility and Bearing Capacity of Specially Shaped Columns with HRB500 Reinforcement

2012 ◽  
Vol 204-208 ◽  
pp. 1066-1069
Author(s):  
Yan Jun Li ◽  
Ping Liu
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Compression Ratio ◽  
Ultimate Load ◽  
Deformation Capacity ◽  
Displacement Ductility ◽  
Yield Load ◽  
Axial Compression Ratio ◽  
Low Cyclic Loading ◽  
Specially Shaped Column

Four specially shaped columns with HRB500 reinforcement were tested under low cyclic loading. The hysteretic curve, yield load, ultimate load, displacement ductility and rigidity degradation were compared in order to research the effect of axial compression ratio on ductility and bearing capacity of specially shaped column with HRB500 reinforcement. It is shown that the axial compression ratio has greater influence on ductility and bearing capacity. With the increase of axial compression ratio, the bearing capacity of HRB500 reinforcement concrete specially shaped column can be enhanced while the deformation capacity becomes worse. The hysteretic characteristic of specially shaped columns with HRB500 reinforcement is improved and the stiffness degeneration becomes slow with the decrease of axial compression ratio.

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.

Comparing Hysteretic Behavior of Flexible Piers with Different Stirrup Ratio and Slenderness Ratio

2011 ◽  
Vol 261-263 ◽  
pp. 576-580
Author(s):  
Xiao Jing Yuan ◽  
Fan Liu
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Slenderness Ratio ◽  
Experimental Studies ◽  
Bridge Engineering ◽  
Hysteretic Behavior ◽  
Hysteresis Curve ◽  
Skeleton Curve ◽  
Displacement Ductility ◽  
Ductility Factor

Flexible piers have been widely used in bridge engineering due to its superior ductility. The stirrup ratio and slenderness ratio were deemed to have a most important impact on hysteretic behavior of them. Five flexible piers were made under static vertical loads and low cyclic horizontal reversed loads. The process of test was introduced and failure mechanism, hysteretic behavior, skeleton curve, ductility, energy dissipation capacity, and stiffness degeneration of flexible piers were analyzed. Experimental studies show that (1) Failure mode of specimen is bending failure and their ductility factor falls between 4.15 and 6.30; (2) displacement ductility factor improves with increasing of the stirrup ratio. Stirrup could greatly improve the capacity on ductility and energy dissipation, while it has little impact on the bearing capacity; (3) ultimate bearing capacity decline with the increase of slenderness ratio, however, when the slenderness ratio member is larger, the hysteresis curve is fuller and energy-dissipation is better.

scholarly journals Seismic behavior of textile-reinforced concrete–strengthened RC columns under different axial compression ratios

2019 ◽  
Vol 14 ◽  
pp. 155892501986570
Author(s):  
Liu Ming ◽  
Yin Shi-Ping ◽  
Cong Xi
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
Compression Ratio ◽  
Seismic Behavior ◽  
Peak Load ◽  
Textile Reinforced Concrete ◽  
Element Analysis ◽  
Rc Columns ◽  
Rc Column ◽  
Axial Compression Ratio

To study the effect of various axial compression ratios on the seismic behavior of reinforced concrete (RC) columns strengthened with textile-reinforced concrete, in this study, an RC column model is established using the finite element analysis software, ABAQUS. This model’s seismic performance under earthquakes is investigated, and the numerical analysis results of the two test pieces are compared with the test results to verify the correctness of the model. The results show that the initial stage of RC loading is under the three-way restraint of the axial force and textile-reinforced concrete material. The yield load and peak load of the textile-reinforced concrete–strengthened RC column increase with the increase in the axial compression ratio. However, the increase in the axial pressure during the loading process accelerates the crack development. The displacement ductility coefficient and the energy dissipation capacity of the specimen are reduced as the axial compression ratio increases. The numerical calculation results of the textile-reinforced concrete–strengthened RC column are in good agreement with the experimental results, indicating that the numerical model based on ABAQUS is reasonable.

The Comparative Study on Less Tooth Differenced Teeth Profile of High Precision FA Pin-Cycloid Gear Transmission

2011 ◽  
Vol 308-310 ◽  
pp. 2224-2229
Author(s):  
Tian Min Guan ◽  
Liang Xuan ◽  
Lei Lei
Keyword(s):  
Theoretical Analysis ◽  
Comparative Study ◽  
Bearing Capacity ◽  
High Precision ◽  
Contact Stress ◽  
Carrying Capacity ◽  
Gear Transmission ◽  
Tooth Surface ◽  
Type Model ◽  
The Comparative Study

In High precision FA type pin-cycloid gear transmission, carrying capacity has always been sacrificed by using one tooth differenced of "Arch Back Teeth Profile" to achieve high precision transmission. Compared with one tooth differenced transmission, two teeth differenced transmission can have more teeth meshing at the same time, namely can have better carrying capacity than one tooth differenced. In order to simultaneously satisfy high-precision transmission and high bearing capacity, this paper do a comparative study on two kinds of less teeth differenced FA pin-cycloidtransmission.Through theoretical analysis, programming one type model calculated two kinds of teeth differenced cases geometric relative rotated angle, the tooth surface contact force and contact stress. Then do a comparative study and analysisaccording to the calculated results.

Sensitivity Parameter Analysis of Bearing Capacity and Ductility of Reinforced Concrete Columns with Z-Shaped Cross-Section

2013 ◽  
Vol 831 ◽  
pp. 158-163
Author(s):  
Jun Ting Jiao ◽  
Rong Hua Yang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Cross Section ◽  
Orthogonal Design ◽  
Limb Length ◽  
Sensitivity Factor ◽  
Rc Columns ◽  
Sensitivity Parameter ◽  
Shaped Cross Section

In order to select sensitivity parameter of bearing capacity and ductility, the orthogonal design method was used to research reinforced concrete (RC) columns with Z-shaped cross-section under compression and bending, by the nonlinear analysis computer program of RC columns with irregularly-shaped cross-section. The seven parameters and four levels of orthogonal design were researched, for example ratio of limb length to limb thickness, ratio of axial compression, loading angle, concrete strength, long reinforce ratio, stirrup diameter and stirrup spacing. The results indicated that the best sensitivity factor of bearing capacity was ratio of limb length to limb thickness, next were loading angle and long reinforce ratio; the best sensitivity factor of ductility was ratio of axial compression, next were stirrup diameter and stirrup spacing. These would afford references for the design of RC columns with Z-shaped cross-section.

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