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Raum: PB-A 107
+49 271 740-5364
riedel@bau.uni-siegen.de
Shear bearing behaviour of slender reinforced concrete members without shear reinforcement with a low ratio of longitudinal reinforcement
Research topic
Shear bearing behaviour of reinforced concrete members
Person in charge
Philipp Riedel, M.Sc.
Project description
Eurocode 2 (EC 2) provides an empirical verification procedure for members not requiring design shear reinforcement without mechanical background. Both, the design value of shear resistance, which depends on the reinforcement ratio and the design value of minimum shear resistance independent of the reinforcement ratio were derived by means of statistical analysis of results from shear tests, which are included in a shear-database.
The relevant shear-database includes available shear test results, which were predominantly obtained on beams in 3- or 4-point-tests. However, the number of data sets for beams with reinforcement ratios ρl ≤ 0.5 % is very low (approximately 3 % of the total database). Especially the design value of minimum shear resistance VRd,c acc. to Eq. (6.2b) in EC 2, which is decisive for members with low reinforcement ratio in most cases, i. e. slabs, does not seem to be sufficiently validated considering the limited number of test results.
In the scope of studying the shear bearing behaviour of members with small ratios of longitudinal reinforcement an experimental programme was developed, in which slender reinforced concrete beams without shear reinforcement made of normal strength concrete C20/25 with rectangular cross section b/h/d [cm] = 32/23/20 and reinforcement ratios 0.22 % ≤ ρl ≤ 3.34 % are examined.
Besides extending the existing shear-database, the shear tests shall help to understand the structural behaviour of low reinforced members without shear reinforcement and to identify the relevant failure mechanisms. The experimental work is accompanied by numerical investigations by means of nonlinear FE-analysis. The main objective is to develop a mechanical based verification procedure for shear design of reinforced concrete members without shear reinforcement.
Publications
RIEDEL, P.; LEUTBECHER, T., 2017. Experimentelle Untersuchungen zur Querkrafttragfähigkeit gering längsbewehrter Stahlbetonbauteile ohne Querkraftbewehrung. In: BREIT, W.; KURZ, W. et al., Hrsg. Beton - weiter denken... Beiträge zur 5. DAfStb-Jahrestagung mit 58. Forschungskolloquium. Kaiserslautern, 20. und 21. September 2017. Kaiserslautern: Technische Universität, Forschungskolloquium Band 2, S. 201-212. ISBN 978-3-00-057267-8
Download
RIEDEL, P.; LEUTBECHER, T., 2017. Shear Bearing Behavior of Slender Reinforced Concrete Members without Shear Reinforcement Containing a Low Ratio of Longitudinal Reinforcement. In: HORDIJK, D.A.; LUKOVIC, M., eds. High Tech Concrete: Where Technology and Engineering Meet: Proceedings of the 2017 fib Symposium, held in Maastricht, The Netherlands, June 12-14, 2017. Cham: Springer International Publishing, pp. 710-718. ISBN 978-3-319-59470-5. doi:10.1007/978-3-319-59471-2_84