Project topic
The calculated shear force resistance of reinforced concrete components without shear reinforcement in accordance with Eurocode 2 (EC 2) is based on empirical approaches without a mechanical background. Both the shear force resistance dependent on the longitudinal reinforcement ratio and the minimum shear force resistance independent of the longitudinal reinforcement ratio were derived from the statistical evaluation of an extensive shear force database.
Project description
The calculated shear force resistance of reinforced concrete components without shear reinforcement in accordance with Eurocode 2 (EC 2) is based on empirical approaches without a mechanical background. Both the shear force resistance dependent on the longitudinal reinforcement ratio and the minimum shear force resistance independent of the longitudinal reinforcement ratio were derived from the statistical evaluation of an extensive shear force database.
The shear force database contains the available results of shear force tests, which were generally obtained worldwide in 3- or 4-point tests on beams. However, the number of data sets for geometric longitudinal reinforcement ratios ρl ≤ 0.5 % is in the low two-digit range (approx. 3 % of the total database for components without shear reinforcement). On this basis, the minimum shear force resistanceVRd,c according to equation (6.2b) in EC 2, which is independent of the longitudinal reinforcement ratio, hardly appears to be sufficiently empirically verified. However, the minimum shear force resistance is decisive for the design of components with a low degree of longitudinal reinforcement, such as slabs.
To study the shear load-bearing behavior of components with low longitudinal reinforcement, a test program was designed in which beams made of concrete of strength class C20/25 with rectangular cross-section b/h/d = 32 cm/23 cm/20 cm and geometric longitudinal reinforcement ratios in the range 0.22 % ≤ ρl ≤ 3.34 % are investigated.
In addition to expanding the existing database, the tests should help to identify the decisive mechanisms for the shear load-bearing behavior and failure of low longitudinally reinforced components without shear reinforcement. Numerical investigations using non-linear FEM accompany the tests. The aim is to develop a mechanically consistent load-bearing model for shear force design.
Publications
RIEDEL, P.; LEUTBECHER, T., 2017. Experimental investigations on the shear load-bearing capacity of reinforced concrete components with low longitudinal reinforcement without shear reinforcement. In: BREIT, W.; KURZ, W. et al, eds. concrete - thinking ahead... Contributions to the 5th DAfStb Annual Conference with 58th Research Colloquium. Kaiserslautern, September 20 and 21, 2017. Kaiserslautern: Technical University, Research Colloquium Volume 2, pp. 201-212. ISBN 978-3-00-057267-8
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Everything at a glance
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Duration
01.01.2015 - 31.09.201 -
Research area
Civil Engineering -
Funding
??: 175.000€
Contact person
Prof. Dr.-Ing. Torsten Leutbecher
Room: PB-A 111/2
+49 271 740-2592
leutbecher@bau.uni-siegen.de
Research methods & procedure
Standardized survey of teachers
The data is collected by means of a questionnaire among conference chairs in order to systematically record their perceptions, attitudes and expectations.
Operationalization of central implementation dimensions
The perception of the reform is analyzed in a differentiated manner using established dimensions such as advantage, fit, complexity and feasibility.
Factor and cluster analysis for type formation
Principal component and cluster analyses are used to identify different types of teachers who differ in their professional and didactic orientations.
Funding bodies and cooperation partners
The project is funded by the Federal Ministry of Education and Research (BMBF) as part of the "Sustainable Universities" program. The aim of the funding is to develop and implement innovative concepts for environmentally friendly and resource-conserving campus design.
Important partners in the project are the city of Siegen, which provides support in the areas of mobility and climate protection, and the Institute for Environmental Research NRW, which provides scientific analysis and expertise. Siegen's municipal utilities are also involved in the implementation of sustainable energy solutions.