Abstract
Flexural capacity of beams reinforced with 400 or 500 MPa grade steel can be accurately estimated by using equations provided in design codes. Recently, 600 MPa grade steel has evolved in the construction industry, and the applicability of existing equations for this grade of steel should be verified by performing experimental investigation. By conducting tests on concrete beams reinforced with 600 MPa grade high‐strength steel, this study investigates the flexural performance for different concrete strength grades and different reinforcement ratios. Flexural capacities of concrete beams reinforced with 400 MPa, 500 MPa, and 600 MPa grade steel are analyzed based on equations in various codes and based on experimental studies in the literature. Furthermore, this study performs reliability analysis and verifies the three design values of 600 MPa grade steel yield strength in relation to the experimental performance and recommends the appropriate design values of 600 MPa grade steel yield strength. Research results show that when the measured values of yield strength of the steel bars and concrete strength are used, the ratio of the measured failure moment value to the calculated value for various beams based on different codes is nearly 1.0, demonstrating the high degree of fitting. Finally, the reliability analysis shows that the design yield strength of the 600 MPa grade high‐strength steel bars should be taken as 520 MPa.
Highlights
In recent years, use of high-strength steel bars has improved the performance of concrete structures and reduced the amount of steel bars
In the United States, South Korea, Canada, and Japan, 70% of the steel reinforcement in reinforced concrete has the strength of 400 MPa and above 25% has the strength of 500 MPa
Barcley and Kowalsky [18] studied the seismic performance of high-strength reinforced concrete (RC) columns, and the results showed that RC columns with steel having the yield strength of 550 MPa behaved similar to columns with steel having yield strength of 420 MPa steel bars in terms of the early stage of yield, length of plastic hinge, and capacity consumption
Summary
Use of high-strength steel bars has improved the performance of concrete structures and reduced the amount of steel bars. Zhang et al [39] suggested that when the yield strength of 600 MPa grade steel bars was taken as 520 MPa, the equation for design of concrete structures (GB 50010) could be safely used for calculating flexural bearing capacity of RC beams with 600 MPa steel bars. In order to study the applicability of codes from various countries in the design of RC beams with high-strength steel bars, this research experimentally investigates the flexural bearing capacity of beams with 600 MPa high-strength reinforcement and different strengths of concrete and combines the test results with those of other scholars to analyze the bearing capacity of RC beams. The reliability of the three design values (500 MPa, 520 MPa, and 545 MPa) of 600 MPa grade steel yield strength is verified in relation to the experimental results, and the appropriate design value of 600 MPa grade steel yield strength is selected
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