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The theoretical principles of the critical shear crack theory for punching shear failures and derivation of consistent closed‐form design expressions
Author(s) -
Muttoni Aurelio,
Fernández Ruiz Miguel,
Simões João T.
Publication year - 2018
Publication title -
structural concrete
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 34
eISSN - 1751-7648
pISSN - 1464-4177
DOI - 10.1002/suco.201700088
Subject(s) - structural engineering , punching , shear (geology) , slab , squat , transverse plane , engineering , geotechnical engineering , materials science , composite material , mechanical engineering , physiology , biology
The mechanical model of the critical shear crack theory ( CSCT ) has been used in the past to investigate a number of shear‐related problems, such as punching of slab–column connections with and without transverse reinforcement. In this paper, a discussion on the differences and analogies between slender slabs and squat members (footings) without transverse reinforcement is presented on the basis of the CSCT . This discussion highlights how bending and shear deformations influence the opening of the critical shear crack and eventually its ability to transfer shear forces. On that basis, it is investigated and justified a power‐law expression to characterize the failure criterion of the CSCT . This criterion, in combination with a suitable load–deformation relationship, can be used to derive closed‐form expressions for punching shear design. The accuracy of these expressions is verified against databases of slender slabs (121 specimens) and footings (34 specimens) with consistent agreement.