Abstract
Flat slabs in contemporary buildings are most commonly supported by rectangular cross-section columns. Research of slabs supported by rectangular cross-section columns for punching is rather narrow. The purpose of this work was the experimental research of slabs punching by rectangular cross-section columns and adjustment of their design method. Reinforced concrete slabs 6 cm in thickness without transverse reinforcement were used as testing specimens. During tests load on the slab was transferred using stamps. Side ratios for stamps varied from 1 to 5 in experiments. Strength and strain properties of concrete were determined before slabs testing for punching. Ultimate loads, that resulted in slab punching, were acquired from test results. Formulae for punching load are suggested for rectangular cross-section columns punching based on obtained results. Generalized analysis of experimental research results shows that slab strength for punching is also influenced by short side of rectangular cross-section to slab thickness ratio.
Highlights
Cast-in-place reinforced concrete buildings with beamless frame represent significant portion in nowadays construction
Flat floor slabs most commonly are supported by rectangular cross-section columns
Punching design for cast-in-place floor slabs according to SP 63.13330.2018 leads to overstatement of load bearing capacity by up to 40% in relation to experimental data [10, 13]
Summary
Cast-in-place reinforced concrete buildings with beamless frame represent significant portion in nowadays construction. Flat floor slabs most commonly are supported by rectangular cross-section columns. Most experimental and theoretic studies associate with research of punching behavior of slabs supported by square cross-section columns [1,2,3,4,5,6,7]. Punching design for cast-in-place floor slabs according to SP 63.13330.2018 leads to overstatement of load bearing capacity by up to 40% in relation to experimental data [10, 13]. Analysis of numerical investigations for stress condition of cast-in-place slabs at punching loads showed that increase in rectangular cross-section columns sides ratio leads to significant non-uniformity in stress and strain distribution across column perimeter [1416]. Most propositions for accounting of non-uniformity in strain and stress distribution across the long side of rectangular columns cross-section come down to artificial reduction of design cross-section perimeter
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