Determination of the actual inclination angle of the lateral faces of the punching shear pyramid for thick slabs based on experimental research results
Abstract
Determination of the actual inclination angle of the lateral faces of the punching shear pyramid for thick slabs based on experimental research results
Incoming article date: 07.05.2025The article presents the results of experimental research on determining the inclination angles to the horizontal of the lateral faces of the punching shear pyramid for thick reinforced concrete slabs. It was found that for slabs with a thickness of 600 mm, the average inclination angle of the punching shear pyramid’s lateral faces to the horizontal is ≈ 34.0°. The article also noted that the value of this angle varies depending on the slab’s reinforcement ratio. The obtained data show that the actual stress-strain state of 'thick' slabs under punching shear significantly differs from the normative model. This necessitates changes to the standard design methodology for the punching shear strength of such structures.
Keywords: punching shear, reinforced concrete, thick slabs, crack inclination angle, experimental studies, design rules, size effect, contribution of longitudinal reinforcement