Group	Finite element analysis (FEA)
Group	Specimen	Max. deflection (mm)	Residual deflection (mm)	Fire resistance (min)	Critical temperature (˚C)	Failure mode
Opening diameter-to-height ratio γ	0.4	−768	−724	18	689	BFB
	0.6	−944	−776	16	574	WB
	0.8	−968	−818	14	404	WB
	0.9	−985	−881	12	344	WB
Opening spacing-to-height ratio η	1	−738	−738	19	724	WB
	1.2	−719	−631	17	707	WB
	1.4	−818	−719	14	467	BFB
	1.6	−907	−742	12	393	BFB
Opening shape	Rectangular	−950	−924	14	446	WB
	Hexagonal	−894	−761	16	467	WB
	Angelina	−663	−580	18	612	BFB
Load ratio μ	0.4	−712	−650	17	623	BFB
	0.5	−887	−754	15	501	BFB
	0.6	−1009	−817	12	390	BFB
	0.7	−1040	−840	10	303	BFB