The　objective　of　this　study　is　to　comprehensively　assess　the　behavior　of　partially　encased　concrete　(PEC)　columns　with　web　openings　under　axial　compression.　The　primary　objectives　of　this　study　are　to　analyze　damage　patterns　and　investigate　the　influence　of　key　parameters,　such　as　concrete　strength,　opening　rate,　and　opening　shape,　on　the　ductility　index　and　ultimate　load-carrying　capacity.　The　study　employs　experimental　testing　to　examine　the　response　of　the　PEC　columns,　with　a　particular　focus　on　the　mechanisms　of　concrete　fracture　and　flange　flexing.　Notably,　the　study　reveals　a　significant　impact　of　the　opening　rate　on　the　bearing　capacity,　while　the　effect　of　opening　shape　is　comparatively　minor.　Furthermore,　computational　analyses　are　conducted　to　deepen　the　understanding　of　structural　behavior.　The　study　builds　upon　existing　research　to　propose　a　novel　method　for　calculating　the　bearing　capacity　of　PEC　columns　with　web　openings.　This　method　introduces　two　discount　factors　to　enhance　predictive　accuracy.　©　The　Author(s)　2024.