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Versuche zum Querkrafttragverhalten bei gleichzeitiger Zugnormalkraft.

Authors :
Adam, Viviane
Claßen, Martin
Hegger, Josef
Source :
Beton- Und Stahlbetonbau. Oct2020, Vol. 115 Issue 10, p821-831. 11p.
Publication Year :
2020

Abstract

Tests on Shear Behaviour with Concurrent Normal Tensile Action Reinforced concrete (RC) slabs under shear loading can sometimes be subjected to additional normal tensile stresses. Examples are slabs under constraint stresses, RC bridge deck slabs of composite arch bridges or silo walls. The coefficient for normal stresses in the current design approach for shear without shear reinforcement according to Eurocode 2 (EC2) was calibrated using tests on prestressed simply supported beams. The influence of normal tensile forces is only approximately covered by the design approach. Therefore, tests were carried out at the Institute of Structural Concrete at RWTH Aachen University on slab strips under shear and simultaneous tensile normal force loading. In addition to single‐span slab segments, tests on continuous members were also carried out to investigate the influence of more realistic structural systems. The point of contraflexure in multi‐span systems results in an area without bending stresses, which divides the shear span into two regions (sagging and hogging moment area). Since the critical shear crack usually develops from a flexural crack for flexural shear failure, the load‐bearing behaviour is influenced by the loading conditions on the one hand and by the combined normal and flexural loading on the other hand. Contrary to the linear approach for the influence of the normal stress in the EC2, a degressive influence of the tensile normal stress on shear capacity was found in the own experimental investigations as well as in tests from literature review with increasing tensile stress. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00059900
Volume :
115
Issue :
10
Database :
Academic Search Index
Journal :
Beton- Und Stahlbetonbau
Publication Type :
Academic Journal
Accession number :
146251298
Full Text :
https://doi.org/10.1002/best.202000003