| Title |
Experimental Study on the Punching Shear Behavior of Flat Plate Structures Using Precast Ultra High-Performance Concrete Joint Members |
| Authors |
이문석(Lee, Moon-Seok) ; 최창식(Choi, Chang-Sik) ; 배백일(Bae, Baek-Il) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.2.389 |
| Keywords |
Precast Concrete; Ultra High-Performance Concrete; Punching Shear; Flat Plate |
| Abstract |
This study examines the behavior of flat plate slab-column joints using precast ultra-high-performance concrete (UHPC) joints designed to
improve punching shear resistance. Although many reinforcement methods have been proposed to prevent punching shear failures, practical
issues such as reinforcement omission and inconsistent material quality continue to occur. To address these challenges, the study introduces a
reinforcement method for flat plate systems that uses precast UHPC joints and evaluates both structural performance and the applicability of
current design codes. The experimental results showed that punching shear strength increased as the steel fiber volume fraction and the width
of the precast UHPC joint increased. Due to the difference in compressive strength between the UHPC panel and the cast-in-place concrete,
multiple diagonal cracks developed. The crack angles varied depending on the steel fiber content and the width of the UHPC precast joint.
Code evaluation indicated that ACI 318-25 underestimated the test results, while KDS 14 20, which incorporates crack-angle considerations
based on the position of the neutral axis, tended to overestimate them. |