Torsional Behavior of Reinforced Concrete Beams with High-Strength Steel Bars

2019 ◽  
Vol 116 (6) ◽  
Author(s):  
Changhyuk Kim ◽  
Seungeun Kim ◽  
Kil-Hee Kim ◽  
DongIk Shin ◽  
Muhammad Haroon ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Strength Steel ◽  
Concrete Beams ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Steel Bars ◽  
Torsional Behavior

scholarly journals EXPERIMENTAL LOAD-DRIFT RELATIONS OF CONCRETE BEAM REINFORCED AND CONFINED WITH HIGH-STRENGTH STEEL BARS UNDER REVERSED CYCLIC LOADING

2021 ◽  
Vol 11 (4) ◽  
pp. 56-69
Author(s):  
Retno Anggraini ◽  
Tavio Tavio ◽  
Gusti Putu Raka ◽  
Agustiar Agustiar
Keyword(s):  
Reinforced Concrete ◽  
High Strength Steel ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Concrete Strength ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Steel Bars ◽  
Normal Strength

High-strength steel bars have different characteristics from normal-strength steel bars. Thus, the use of high-strength steel bars still needs to be investigated further before it can be used confidently in concrete structures. In the design, a reinforced concrete beam should also have enough ductility besides its loading capacity. One of the indicators identifies that a structure has sufficient ductility is its ability to maintain the load steadily due to progressive deformation. This paper presents the test results of three reinforced concrete beams designed with concrete strength (fc) of 30 MPa. Two different yield strengths (fy) of longitudinal and transverse reinforcements were used, namely, 420 and 550 MPa. The cross-sectional dimensions of the beams were 200  300 mm with a total span of 2000 mm and a rigid stub at the midspan. The beams were simply supported by double rollers at their tops and bottoms. These special supports were located at both ends of the beams. The load applied at the midspan of the beam through the rigid stub with the displacement control. The loading pattern protocol by the drift was set from 0 to 5.5 percent. Based on the test results, it can be seen that the beams with high-strength steel bars could achieve a higher load capacity than the beams with normal-strength steel bars. On the other hand, the beams with high-strength steel bars produced lower deflection than the beams with normal-strength steel bars. Furthermore, it can be concluded that all the beams could withstand the minimum required of 3.5 percent. None of the beams indicated brittle failures. All of the beams could survived until the end of the cycles at a drift of 5.5 percent. This condition indicates that the reinforced concrete beams with higher-strength reinforcement (fy of 550 MPa) could also maintain their load capacities under large deformation beyond the first yielding of the longitudinal steel bars.

Research on Short Term Flexural Stiffness of Concrete Beams with High Strength Steel Bars

2012 ◽  
Vol 446-449 ◽  
pp. 435-444
Author(s):  
Jian Min Zhou ◽  
Shuo Chen ◽  
Xiao Feng Wang ◽  
Yong Zhao ◽  
Yun Tan
Keyword(s):  
Reinforced Concrete ◽  
High Strength Steel ◽  
Concrete Beams ◽  
High Strength ◽  
Load Level ◽  
Systematic Research ◽  
Flexural Stiffness ◽  
Short Term ◽  
Steel Bars ◽  
Tongji University

Several batches of reinforced concrete (RC) and prestressed reinforced concrete (PRC) beams with 500MPa steel bars were tested in Tongji University, recently. The results indicated that the development of flexural stiffness after concrete cracking was influenced mainly by three parameters including initial elastic flexural stiffness, longitudinal reinforcement ratio and load level. Based on our 20 years' systematic research on crack and stiffness, a simpler unified formula is suggested after theoretical analyses for predicting short term flexural stiffness of concrete beams using high strength steel bars. Comparison with calculations from different codes at home and abroad exhibits that the suggested formula is precise and practical for both RC and PRC beams.

scholarly journals Determination of the Optimum Percentage of High Strength Bars in RC Beams with Combined Reinforcement Using Fem

2020 ◽  
Vol 2 (1) ◽  
pp. 230-236
Author(s):  
Jacek Selejdak ◽  
Yaroslav Blikharskyy ◽  
Taras Bobalo ◽  
Nadiia Kopiika
Keyword(s):  
Mathematical Modeling ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Reinforced Concrete Structures ◽  
Rc Beams ◽  
Reinforcement Percentage ◽  
Steel Bars

AbstractIn this work on the basis of the developed and tested mathematical model, the numerical experiment is conducted in order to study in more detail the specifics of performance of concrete beams` with combined reinforcement. For this purpose nine series of reinforced concrete beams with different combination of steel bars (A400C, At800, A1000) and ribbon reinforcement (C275) were modeled. In the developed series two classes of concrete were used: C50/60, C35/45. The functions derived on the basis of mathematical modeling allow us to determine the recommended percentage of high-strength reinforcement of common reinforced concrete structures with single reinforcement. Therefore, the possibility is obtained to reduce the total structures` reinforcement percentage, increasing their deformability by the specified value without affecting the bearing capacity.

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