Punching Capacity of UHPC Post Tensioned Flat Slabs with and Without Shear Reinforcement: An Experimental Study

Punching capacity is one of the main items in the design of both pre-stressed and non-pre-stressed flat slabs. All international design codes include provisions to prevent this type of failure. Unfortunately, there is no code provision for UHPC yet, and hence, the aim of this research is to experimentally investigate the impact of column dimensions and punching reinforcement on the punching capacity of post-tensioned slabs and compare the results with the international design codes’ provisions to evaluate its validity. The test program included five slabs with a compressive strength of ۱۲۰ MPa: one as a control sample, two to study the effect of column size, and the last two to study the effect of punching reinforcement. Comparing the results with the design codes showed that ACI-۳۱۸ is more accurate with an average deviation of about ۵%, while EC۲ is more conservative with an average deviation of about ۲۰%. Besides that, punching reinforcement reduces the size of the punching wedge by increasing the crack angle to ۲۸° instead of ۲۲° for slabs without punching reinforcement. Also, the results assure that both ductility and stiffness are enhanced with the increased column dimensions and punching reinforcement ratio. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۳-۰۹-۰۳-۰۶ Full Text: PDF

کلیدواژه ها:

Ultra-High-Performance Concrete ، Post-Tensioning ، Flat Slabs ، Punching Shear.