Abstract Steel fiber reinforced concrete (SFRC) enhances the flexural capacity of flat slabs and, due to its effectiveness in statically redundant bi‐dimensional elements, represents a viable alternative to conventional reinforcement. Although numerous studies have investigated the flexural behavior of SFRC slabs with and without bonded reinforcement, experimental data on their punching shear behavior are quite few. Moreover, only limited research has addressed the interaction between steel fibers and post‐tensioning, a common and effective technique for flat slabs. To investigate the punching behavior of unbonded post‐tensioned SFRC slabs, flat slabs with different fiber contents were tested. The post‐tensioning system consisted of straight unbonded strands arranged in a uniform‐banded layout. This paper discusses the results of the experimental campaign and compares the behavior of SFRC slabs with plain concrete slabs, highlighting the role of fibers in the failure mode. Finally, the experimental results are compared with predictions from the Yield Line Theory, the fib Model Code 2020 and the second generation of Eurocode 2.
Gaddi et al. (Thu,) studied this question.