This　study　investigates　the　punching　shear　behavior　of　reinforced　ultra-high　performance　concrete　(RUHPC)　circular　slabs　with　openings,　focusing　on　the　effects　of　perforation　diameter,　steel　fiber　volume　fraction　and　shear　reinforcement　ratio　on　punching　shear　strength.　Experimental　results　reveal　a　novel　failure　mechanism　where　energy　dissipation　during　punching　is　partitioned　into　radial　and　circumferential　yield　line　contributions,　reflecting　the　combined　ductile　and　brittle　failure　characteristics　of　RUHPC.　A　mechanical　model　is　developed　by　integrating　the　yield　line　method　with　the　rigid　body　displacement　approach,　thereby　bridging　plastic　hinge　rotations　at　the　slab　bottom　and　brittle　fracture　at　the　punching　surface.　Utilizing　this　model,　the　study　further　investigates　the　influence　of　the　punching-to-span　ratio,　slab　thickness,　localized　loading　area　and　reinforcement　ratio　on　the　punching　shear　strength.　The　findings　provide　valuable　insights　into　the　design　and　performance　optimization　of　RUHPC　circular　slabs　under　punching　shear　conditions.　©　2025　Institution　of　Structural　Engineers