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Experimental investigations on the punching behaviour of reinforced concrete footings with structural dimensions
Author(s) -
Siburg Carsten,
Hegger Josef
Publication year - 2014
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.201300083
Subject(s) - punching , slab , reinforcement , cracking , structural engineering , geotechnical engineering , flexural strength , shear (geology) , shear strength (soil) , materials science , composite material , engineering , geology , soil water , soil science
Punching tests on 13 specimens under uniform soil pressure were conducted to evaluate the punching shear behaviour of footings with practical dimensions. The test series included square footings with and without punching shear reinforcement. The dimensions of the footings varied between 1.20 × 1.20 m and 2.70 × 2.70 m and the slab thickness varied between 0.45 and 0.65 m, resulting in shear span‐depth ratios a λ /d between approx. 1.25 and 2.00. In addition to the measured steel strains in the flexural reinforcement and the stirrups, the increase in the slab thickness as well as the saw‐cuts were examined to investigate the internal cracking and failure characteristic. In combination with previous tests conducted at RWTH Aachen University, this test series permits a description of the effect of the main parameters on the punching shear strength of footings. These parameters are the size effect of the effective depth, the concrete compressive strength, the flexural reinforcement ratio and the punching shear reinforcement.