TY - GEN
T1 - Shear tests on reinforced concrete beams focused on the transition of beams with and without shear reinforcement
AU - Betschoga, Christoph
AU - Gheorghiu, Daniel
AU - Rosenhahn, Sebastian
AU - Hegger, Josef
AU - Viet, Tue Nguyen
N1 - Funding Information:
The authors would like to express their gratitude to the Austrian Science Fund (FWF) and the German research foundation (DFG) for making this research possible. The authors also thank the Laboratory for Structural Engineering of the TU Graz (LKI) for conducting the tests.
Publisher Copyright:
© 2022, fib. The International Federation for Structural Concrete. All rights reserved.
PY - 2022
Y1 - 2022
N2 - This paper presents an experimental study on the shear resistance of reinforced concrete beams (RC beams) with low or even no shear reinforcement. In contrast to conventional 3-or 4-point bending tests this study includes also tests under different loading and support conditions. A total of 9 RC beams, consisting of 4 single span beams under concentrated loads (4-point bending tests) and 5 cantilever beams under distributed loads will be presented. The shear reinforcement ratio was varied in the range of 0-2.1 times the required minimum shear reinforcement (ρw,min) according to EC2. The different shear reinforcement ratios were realized with closed stirrups of different diameters between 6-12 mm but fixed stirrup spacing. The results show significant differences in the shear resistance between comparable RC beams with different loading and support conditions, especially for beams with low shear reinforcement. Compared to the cantilever beams under distributed loads the increase in shear resistance of the single span beams under concentrated loads was significantly smaller for shear reinforcement ratios around or below ρw,min. However, when the shear reinforcement was increased the test results indicate that the loading and support conditions become less important. The crack pattern was recorded by hand for all beams. A comparison between the test results and the predictions according to some codes of practice e.g., EC2 and MC10, is also provided.
AB - This paper presents an experimental study on the shear resistance of reinforced concrete beams (RC beams) with low or even no shear reinforcement. In contrast to conventional 3-or 4-point bending tests this study includes also tests under different loading and support conditions. A total of 9 RC beams, consisting of 4 single span beams under concentrated loads (4-point bending tests) and 5 cantilever beams under distributed loads will be presented. The shear reinforcement ratio was varied in the range of 0-2.1 times the required minimum shear reinforcement (ρw,min) according to EC2. The different shear reinforcement ratios were realized with closed stirrups of different diameters between 6-12 mm but fixed stirrup spacing. The results show significant differences in the shear resistance between comparable RC beams with different loading and support conditions, especially for beams with low shear reinforcement. Compared to the cantilever beams under distributed loads the increase in shear resistance of the single span beams under concentrated loads was significantly smaller for shear reinforcement ratios around or below ρw,min. However, when the shear reinforcement was increased the test results indicate that the loading and support conditions become less important. The crack pattern was recorded by hand for all beams. A comparison between the test results and the predictions according to some codes of practice e.g., EC2 and MC10, is also provided.
UR - http://www.scopus.com/inward/record.url?scp=85142801617&partnerID=8YFLogxK
M3 - Conference paper
AN - SCOPUS:85142801617
SN - 9782940643172
T3 - fib Symposium
SP - 57
EP - 64
BT - 14th fib Phd Symposium in Civil Engineering, 2022, Proceedings
A2 - di Prisco, Marco
A2 - Meda, Alberto
A2 - Balazs, Gyorgy L.
PB - fib. The International Federation for Structural Concrete
T2 - 14th fib PhD Symposium in Civil Engineering
Y2 - 5 September 2022 through 7 September 2022
ER -