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New insights into flexural shear behaviour using digital image correlation
Publikationstyp
Conference Paper
Date Issued
2022
Sprache
English
Author(s)
Start Page
1518
End Page
1527
Citation
6th fib International Congress on Concrete Innovation for Sustainability, 2022
Contribution to Conference
Scopus ID
Publisher
fib. The International Federation for Structural Concrete
ISBN of container
978-294064315-8
General knowledge on flexural shear has been obtained from tests on simply supported beams under single loads. This represents the basis for many shear design approaches. However, real structural components are typically continuously supported and have intermediate supports leading to shifting moments. Also, they are usually loaded by distributed loads. In order to investigate the influence of several parameters, an experimental campaign was conducted comprising 34 large scale tests on slab segments (wide and linear) without shear reinforcement with an effective depth of d ≈ 24 cm at the Institute of Structural Concrete of RWTH Aachen University, Germany. Within the tests, the width, the support conditions (simple and continuous supports), the longitudinal reinforcement ratio, the shear slenderness and the vertical loading (single and uniformly distributed loads) were varied. A thorough evaluation of the shear span using Digital Image Correlation (DIC) revealed detailed insights regarding the bearing behaviour. The DIC evaluations allowed to retrospectively observe the sequence of cracking in the shear span which allowed to draw substantial conclusions regarding the interacting mechanisms which contribute to transferring shear stresses (such as dowel action of the longitudinal bars, aggregate interlock, crack process zone and shear stresses in the uncracked flexural compression zone) and the potential trigger of failure based on the measured crack kinematics. In this paper, results of DIC evaluations of one flexural shear test with simple supports and a single load as well as one test featuring its shear span next to an intermediate support are exemplarily presented in detail. General results and conclusions of the study are summarised.
Subjects
DIC measurements
flexural shear
shear transfer mechanisms
DDC Class
690: Building, Construction
600: Technology