Design for Punching Shear to AS5100.5 (Concrete 2021)

Recorded during Concrete 2021, this webinar describes an investigation into the AS5100.5 – 2017 Bridge Design code clauses for punching shear in RC slabs and proposes a replacement to clause 9.2. The investigation findings are influenced by experience in the design of slabs greater than 1m thick supported by columns of a similar dimension subjected to heavy loading. All columns are internal columns rather than edge or corner columns. The findings suggest that the design code may be non-conservative and/or confusing in some situations. Experienced practitioners apply the code rules with different interpretations of the clauses. Some of the code clauses investigated apply to both beams and slabs.
The discussion in this paper relates to the application of these clauses in slabs, especially thick slabs. These clauses are similar to punching shear clauses contained in AS3600. Findings may in some instances apply to AS3600 as well as AS5100.5.