Experimental and numerical analysis on the structural fire behaviour of three-cell hollowed concrete masonry walls

•Research on structural behaviour of three-cell hollowed concrete masonry walls in fire.•Specimens with three cells concrete blocks subjected to in-plane serviceability load.•Experimental and numerical tests compared with EN1996-1–2:2005 provisions.•Simplified calculation method in Annex C of EN 1996–1.2 overestimates fire resistance.