Nonlinear Buckling Analysis of Thin-Walled Box Beams considering Shear Lag

Table 6

Buckling moments and relative errors when the load height is  m.

L (m)	t2 (mm)	t4 (mm)	Buckling moments (KN·m)						Δ1 (%)	Δ2 (%)	Δ3 (%)	Δ4 (%)	Δ5 (%)
			FEA	Meftah	Present nonlinear	Present linear	Tan nonlinear	Tan linear
3	5	5	225835	213002.21	223166.87	211266.27	220136.36	206738.29	5.68	1.18	6.45	2.52	8.46
	8	5	284822	259501.48	263471.40	252847.55	261261.62	248003.56	8.89	7.50	11.23	8.27	12.93
	6.5	6.5	279215	250135.71	255005.17	246604.78	253219.72	242447.34	10.41	8.67	11.68	9.31	13.17
	8	8	319554	285775.59	291819.43	282277.02	288867.14	276512.60	10.57	8.68	11.67	9.60	13.47
4	5	5	185347	173739.28	179231.77	170477.61	179247.22	166251.83	6.26	3.30	8.02	3.29	10.30
	8	5	232178	214779.69	222355.92	202710.09	217341.62	200551.73	7.49	4.23	12.69	6.39	13.62
	6.5	6.5	224293	204061.08	214146.40	194871.77	205642.26	191828.59	9.02	4.52	13.12	8.32	14.47
	8	8	295826	268658.00	281732.67	256199.83	269211.21	252482.85	9.18	4.76	13.40	9.00	14.62
5	5	5	138531	129328.49	133717.80	128925.13	130852.96	127093.14	6.64	3.47	6.93	5.54	8.26
	8	5	162876	148774.34	155911.16	147076.83	152361.35	144382.62	8.66	4.28	9.70	6.46	11.35
	6.5	6.5	159572	145679.79	152418.63	143205.59	147403.37	140670.70	8.71	4.48	10.26	7.63	11.84
	8	8	185976	168907.25	176252.37	165829.93	171598.74	162866.93	9.18	5.23	10.83	7.73	12.43