Modified Rectangular Stress Block for High Strength RC Columns to Axial Loads with Bidirectional Eccentricities

2003 ◽  
Vol 15 (2) ◽  
pp. 335-343
Author(s):  
Suk-Hyeong Yoo ◽  
Byong-Youl Bahn ◽  
Sung-Woo Shin
Keyword(s):  
High Strength ◽  
Axial Loads ◽  
Rc Columns ◽  
Stress Block

Experimental Study of Strengthening of RC Columns with Steel Fiber Concrete

2020 ◽  
Vol 1002 ◽  
pp. 551-564
Author(s):  
Wathiq Jassim Mhuder ◽  
Samir M. Chassib
Keyword(s):  
Experimental Study ◽  
Cross Section ◽  
Load Capacity ◽  
High Strength ◽  
Experimental Program ◽  
Axial Loads ◽  
Concrete Core ◽  
Rc Columns ◽  
Load Carrying ◽  
Steel Fiber Concrete

This study introduces an experimental program to investigate the performance of concrete wrapping jackets reinforced by steel fibers used for retrofitting of the square and circular RC columns under axial loads. Ten columns divided into two groups; the first group included seven square columns while the second group involved three circular columns. The experimental study included testing the columns with varied parameters such as cross-section shape, type and aspect ratio of steel fibres, jacket thickness, and using several techniques for retrofitting the column such as strengthening by plain and reinforced concrete jackets. The selected parameters affected the compressive behavior of confined columns high strength concrete jackets. The obtained results revealed that all strengthened columns with square cross-section appeared maximum strength greater than a circular one. Using several types of concrete jacketing promotes the load-capacity of the column with a clear improvement in the ductility. Increasing thickness appeared increasing in the load-carrying capacity in comparison with the reference column. Using the straight fibres showed better enhancement in the load capacity than the hooked ones. The main result was the failure mode was different from unstrengthen columns which showed more crushing in the concrete core with an increase in thickness.

Preloaded RC columns strengthened with high-strength concrete jackets under uniaxial compression

2007 ◽  
Vol 41 (7) ◽  
pp. 1251-1262 ◽  
Author(s):  
Adilson Roberto Takeuti ◽  
Joao Bento de Hanai ◽  
Amir Mirmiran
Keyword(s):  
Uniaxial Compression ◽  
High Strength Concrete ◽  
High Strength ◽  
Rc Columns ◽  
Strength Concrete

Analysis of stress block parameters for high strength concrete

2020 ◽  
Vol 6 (1) ◽  
pp. 1-9
Author(s):  
Brijesh Singh ◽  
Vikas Patel ◽  
P. N. Ojha ◽  
V. V. Arora
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Stress Block

scholarly journals Flexural Strength Evaluation of Reinforced Concrete Members with Ultra High Performance Concrete

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Baek-Il Bae ◽  
Hyun-Ki Choi ◽  
Chang-Sik Choi
Keyword(s):  
Flexural Strength ◽  
High Performance ◽  
Strain Softening ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
High Strength ◽  
Tension Stress ◽  
Compression Stress ◽  
Ultra High Performance Concrete ◽  
Stress Block

Flexural strength evaluation models for steel fiber reinforced ultra high strength concrete were suggested and evaluated with test results. Suggested flexural strength models were composed of compression stress blocks and tension stress blocks. Rectangular stress block, triangular stress block, and real distribution shape of stress were used on compression side. Under tension, rectangular stress block distributed to whole area of tension side and partial area of tension side was used. The last model for tension side is realistic stress distribution. All these models were verified with test result which was carried out in this study. Test was conducted by four-point loading with 2,000 kN actuator for slender beam specimen. Additional verifications were carried out with previous researches on flexural strength of steel fiber reinforced concrete or ultra high strength concrete. Total of 21 test specimens were evaluated. As a result of comparison for flexural strength of section, neutral axis depth at ultimate state, models with triangular compression stress block, and strain-softening type tension stress block can be used as exact solution for ultra high performance concrete. For the conservative and convenient design of section, modified rectangular stress block model can be used with strain softening type tension stress block.

Slender high-strength RC columns under eccentric compression

2005 ◽  
Vol 57 (6) ◽  
pp. 361-370 ◽  
Author(s):  
O. Germain ◽  
B. Espion
Keyword(s):  
High Strength ◽  
Rc Columns ◽  
Eccentric Compression

The influence of stirrup-confined action on the size effect of high-strength RC columns under small eccentric compression

2017 ◽  
Vol 47 (4) ◽  
pp. 437-447
Author(s):  
Liu JIN ◽  
ZiXing DING ◽  
Dong LI ◽  
XiuLi DU
Keyword(s):  
Size Effect ◽  
High Strength ◽  
Rc Columns ◽  
Eccentric Compression

Size effect tests of high-strength RC columns under eccentric loading

2016 ◽  
Vol 126 ◽  
pp. 78-91 ◽  
Author(s):  
Chengshun Xu ◽  
Liu Jin ◽  
Zixing Ding ◽  
Dong Li ◽  
Xiuli Du
Keyword(s):  
Size Effect ◽  
High Strength ◽  
Rc Columns
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