The Consequence of the Involvement of Flexural, Compression, and Punching Reinforcement Upon Punching Strength

Flat slabs have an important role in concrete buildings due to their architectural flexibility and speed of construction. Punching shear is one of the most important phenomena to be considered during the design of reinforced concrete flat slabs, as this type of failure is brittle and does not predict previously raised alarms before failure. The main factors that affect punching strength in concrete are compressive strength, flexural reinforcement, and punching reinforcement in the form of stirrups, shear studs, or other shapes. This paper is part of a research program operated at the reinforced concrete laboratory of the Faculty of Engineering, Cairo University, to evaluate the contribution of horizontal flexural reinforcement, horizontal compression reinforcement, and vertical punching reinforcement on the punching strength of reinforced concrete flat slabs. In this research, fifteen half-scale specimens are cast and tested. The specimens had dimensions of ۱۱۰۰×۱۱۰۰ mm and a total thickness of ۱۲۰ mm. All specimens were connected to a square column of dimensions ۱۵۰×۱۵۰ mm and loaded at the four corners with a supported span of ۱۰۰۰ mm. The main parameters considered in this research included spacing between stirrups, width of the stirrups, number of stirrup branches, ratio of the compression reinforcement, and ratio of the tension reinforcement. During testing, ultimate capacity, steel strain, cracking pattern, and deformation were recorded. The experimental results were analyzed and compared against values estimated from different international design codes. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۴-۰۱۰-۰۹-۰۱۴ Full Text: PDF

Keywords:

Punching , Flat Concrete Slabs , Longitudinal Steel , Punching Vertical Reinforcement , Crack Pattern , Load at Ultimate Stage.