Size effect tests of normal-strength and high-strength RC columns subjected to axial compressive loading

2016 ◽  
Vol 109 ◽  
pp. 43-60 ◽  
Author(s):  
Dong Li ◽  
Liu Jin ◽  
Xiuli Du ◽  
Jia Fu ◽  
Aizhen Lu
Keyword(s):  
Size Effect ◽  
Compressive Loading ◽  
High Strength ◽  
Rc Columns ◽  
Normal Strength

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

Flexural behavior and size effect of normal-strength RC columns under monotonic horizontal loading

2018 ◽  
Vol 166 ◽  
pp. 251-262 ◽  
Author(s):  
Yongping Xie ◽  
Zhenbao Li ◽  
Lei Jia ◽  
Hongyu Zhou ◽  
Wenting Bai ◽  
...  
Keyword(s):  
Size Effect ◽  
Flexural Behavior ◽  
Rc Columns ◽  
Horizontal Loading ◽  
Normal Strength

scholarly journals Effect of Nano Clay and Marble Powder Waste as a Hybrid Addition on the Behavior of Normal and High Strength RC Columns Subjected to Axial Compressive Loading

2021 ◽  
Vol 6 (3) ◽  
pp. 367-384
Author(s):  
Mostafa Ahmed Mahdi ◽  
Ahmed Hassan Ghallab ◽  
El-Saaid Ibrahim Zaki ◽  
Ahmed Sayed Elmannaey
Keyword(s):  
Compressive Loading ◽  
High Strength ◽  
Rc Columns ◽  
Nano Clay ◽  
Marble Powder

Experimental and numerical investigations on the size effect of moderate high-strength reinforced concrete columns under small-eccentric compression

2017 ◽  
Vol 27 (5) ◽  
pp. 657-685 ◽  
Author(s):  
Liu Jin ◽  
Zixing Ding ◽  
Dong Li ◽  
Xiuli Du
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Size Effect ◽  
Compressive Loading ◽  
High Strength ◽  
Concrete Columns ◽  
Failure Behavior ◽  
Reinforced Concrete Columns ◽  
Failure Patterns ◽  
Softening Behavior

The paper deals with an experimental investigation and numerical simulation of moderate high-strength reinforced concrete (RC) columns subjected to a small-eccentric compressive loading ( e0 = 0.25 h0). A series of tests on the behavior of 12 geometrically similar moderate high-strength reinforced concrete columns with two different stirrups ratios (i.e., 0% and 0.66%) were conducted. The maximum structural size of the square reinforced concrete columns was 800 mm. A 2D mesoscale method for the simulation of the behavior of reinforced concrete columns was established. The numerical tests on the reinforced concrete columns with larger stirrup ratios (1.2% and 2.4%) were carried out complementarily, based on the fact that the simulation results were consistent with the available test observations. The failure patterns, the nominal compressive stress–strain relationships, the nominal compressive strength, and the post-peak softening behavior of the reinforced concrete columns were studied. Furthermore, the influence of stirrups on failure behavior and size effect of the reinforced concrete columns was revealed. One can conclude that (1) the size effect exists in the nominal compressive strength of the eccentrically loaded high-strength reinforced concrete columns with the four different stirrup ratios; (2) comparison of the present test results and the “size effect law” proposed by Bažant shows good agreement; (3) the presence of stirrups improves the nominal strengths, makes the failure of columns less brittle, and weakens the size effect; and (4) the proposed mesoscale numerical method is capable of describing the mechanical behavior of eccentrically loaded reinforced concrete columns.

A Comparative Investigation on Normal and High Strength Concrete Beams under Torsion

2022 ◽  
Vol 1048 ◽  
pp. 359-365
Author(s):  
Ihtesham Hussain Mohammed ◽  
Ahmed Majid Salim Al Aamri ◽  
Shakila Javed ◽  
Yahya Ubaid Al Shamsi
Keyword(s):  
High Strength Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Comparative Investigation ◽  
Mineral Admixtures ◽  
Torsional Loading ◽  
Torsional Strength ◽  
Strength Concrete ◽  
Loading Method ◽  
Normal Strength

In this study, an experimental investigation was done to study the behaviour of Normal Strength Concrete (NSC) and High Strength Concrete (HSC) Plain beams under torsion with the concrete mix of M40 and M100. No mineral admixtures are used to obtain the required strength of concrete. Eight NSC beams and eight HSC beams whose width was varying with 75 mm, 100 mm, and 150 mm; depth varying as 75 mm, 100 mm, 150 mm and 200 mm; and span of the beams varying 600 mm, 800 mm and 1200 mm were casted and cured to stud the effect of torsion. The principle aim of this study was to understand the torsional behaviour of the NSC and HSC beams for rotation, cracking, size effect and torsional strength. A standard torsional loading method was used for conducting the testing of beams. The results obtained were compared with different theories and code equations. It was observed that the torsional strength of the beam increases with the increase in strength of concrete. HSC beams have higher torsional strength than the NSC beams which has the same amount of reinforcement.

Bond behavior of high strength concrete under reversed pull-out cyclic loading

2002 ◽  
Vol 29 (2) ◽  
pp. 191-200 ◽  
Author(s):  
M Alavi-Fard ◽  
H Marzouk
Keyword(s):  
Cyclic Loading ◽  
Bond Strength ◽  
High Strength Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Displacement Curve ◽  
Bond Slip ◽  
Strength Concrete ◽  
Pull Out ◽  
Normal Strength

Structures located in seismic zones require significant ductility. It is necessary to examine the bond slip characteristics of high strength concrete under cyclic loading. The cyclic bond of high strength concrete is investigated under different parameters, including load history, confining reinforcement, bar diameter, concrete strength, and the rate of pull out. The bond strength, cracking, and deformation are highly dependent on the bond slip behavior between the rebar and the concrete under cyclic loading. The results of cyclic testing indicate that an increase in cyclic displacement will lead to more severe bond damage. The slope of the bond stress – displacement curve can describe the influence of the rate of loading on the bond strength in a cyclic test. Specimens with steel confinement sustained a greater number of cycles than the specimens without steel confinement. It has been found that the maximum bond strength increases with an increase in concrete strength. Cyclic loading does not affect the bond strength of high strength concrete as long as the cyclic slip is less than the maximum slip for monotonic loading. The behavior of high strength concrete under a cyclic load is slightly different from that of normal strength concrete.Key words: bond, high strength, cyclic loading, bar spacing, loading rate, failure mechanism.

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