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

Table 7

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

L (m)	t2 (mm)	t4 (mm)	Buckling moments in (KN·m)						Δ1 (%)	Δ2 (%)	Δ3 (%)	Δ4 (%)	Δ5 (%)
			FEA	Meftah	Present nonlinear	Present linear	Tan nonlinear	Tan linear
3	5	5	227568	218984.20	224733.00	213629.25	220487.77	208314.22	3.77	1.25	6.13	3.11	8.46
	8	5	286538	271574.24	279651.51	267208.35	271402.49	261601.91	5.22	2.40	6.75	5.28	8.70
	6.5	6.5	280801	261425.78	273238.50	261238.57	264030.17	253839.75	6.90	2.69	6.97	5.97	9.60
	8	8	321619	286037.73	309914.91	285676.66	291390.65	278627.90	11.06	3.64	11.18	9.40	13.37
4	5	5	193686	176416.22	184194.28	175451.18	180291.54	171150.55	8.92	4.90	9.41	6.92	11.64
	8	5	252012	227827.91	239620.01	225511.64	230640.22	221674.48	9.60	4.92	10.52	8.48	12.04
	6.5	6.5	231983	210841.97	220204.92	206846.99	211561.88	201911.15	9.11	5.08	10.84	8.80	12.96
	8	8	297230	270095.40	282007.76	263162.24	270816.00	257204.08	9.13	5.12	11.46	8.89	13.47
5	5	5	138719	129404.94	136127.97	130180.71	134545.10	129216.81	6.71	1.87	6.16	3.01	6.85
	8	5	163506	151520.11	157885.73	149802.14	154473.85	144995.82	7.33	3.44	8.38	5.52	11.32
	6.5	6.5	160061	147786.97	152596.97	143508.83	150411.54	140978.89	7.67	4.66	10.34	6.03	11.92
	8	8	186072	170100.49	177063.44	166817.47	174786.55	163819.47	8.58	4.84	10.35	6.07	11.96