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Artigos • Matéria (Rio J.) 28 (1) • 2023 • https://doi.org/10.1590/1517-7076-RMAT-2022-0308 copy

Bending behavior of wooden beams reinforced with steel profiles: experimental and computational analysis

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This paper verified the structural behavior of three configurations of composite beams of wood and steel profiles, analytically by the mixed section homogenization method (MHSM), by experimental tests and simulated by the finite element method (FEM). Unreinforced wooden beam (V-SR), with bent steel sheet profiles fixed with stud (V-PRI) and self-tapping (V-AUT) screws were analyzed. The flexural behavior was analyzed by 3 points of these elements, represented by the load and displacement. It was found that the beam failure form was the same in all configurations, occurring in the tensioned part, without lateral buckling of the steel profiles or plastic deformation of the screws. It was noted that the insertion of steel profiles caused an increase in the strength of the composite beams, being 100% in the V-PRI sample and 32% in the V-AUT. The FEM simulations showed values closer to the bending behavior of the V-SR and V-PRI beams in the elastic regime (ELS). The experimental results of the V-AUT beams were more compatible with the mixed section homogenization model.

Keywords
beams; mixed structures; computer simulation; wood; metallic reinforcement

PROPRIEDADE	AÇO CST CIVIL 300	PROPRIEDADE	CEDRO [¹⁴[14] INSTITUTO DE PESQUISAS TECNOLÓGICAS, Fichas de características das madeiras brasileiras, 2 ed., São Paulo, IPT, 1989.]
f_y (MPa)	363	ρ_ap (kg/m³)	530
f_u (MPa)	434	ρ_bas (kg/m³)	440
ε (%)	26	ƒ_co (MPa)	39,1
Redução de área (%)	66	E_co (GPa)	9,6

PROPRIEDADE	ESTUDO	Δ_e-IPT
ρ_ap (kg/m³)	619	+17%
ρ_bas (kg/m³)	518	+18%
ƒ_co (MPa)	37,2	–5%
E_co (GPa)	3,7	–61%

PROPRIEDADE	ESTUDO	Δ_e-CST
f_y (MPa)	316	–13%
f_u (MPa)	457	+5%
E (GPa)	207	–1%

AMOSTRA	EXEMPLAR	CARGA ÚLTIMA (kN)		DESLOCAMENTO ÚLTIMO (mm)
AMOSTRA	EXEMPLAR	VALOR UNITÁRIO	MÉDIA ± DP	VALOR UNITÁRIO	MÉDIA ± DP
V-SR	1	9,98	8,22 ± 1,53	57,45	51,4 ± 5,26
	2	7,22		47,89
	3	7,47		48,86
V-PRI	1	18,07	16,96 ± 1,85	67,52	57,92 ± 11,95
	2	14,82		44,53
	3	17,98		61,70
V-AUT	1	7,60	10,92 ± 2,01	63,61	45,90 ± 15,42
	2	10,92		35,41
	3	12,13		38,69

CARGA (kN)	DESLOCAMENTO (mm)
	V-SR		V-PRI		V-AUT
	MHSM	MEF	MHSM	MEF	MHSM	MEF
1	10,20	4,29	2,47	2,53	2,47	1,15
2	20,39	8,48	4,95	4,73	4,95	2,21
3	30,59	12,67	7,42	6,71	7,42	3,28
4	40,79	16,86	9,89	8,59	9,89	4,35
5	50,98^* * – deslocamento na ruptura.	21,05	12,36	10,44	12,36	5,42
6	–	25,19	14,83	12,28	14,83	6,48
7	–	29,43	17,31	14,09	17,31	7,55
8	–	33,62	19,78	15,91	19,78	8,62
9	–	37,81	22,25	17,72	22,25	9,68
10	–	42,00^* * – deslocamento na ruptura.	24,72	19,53	24,72	10,74
11	–	–	27,20	21,34	27,20	11,81
12	–	–	29,67	23,15	29,67	12,87
13	–	–	32,14	24,95	32,14	13,94
14	–	–	34,61	26,74	34,61	15,01
15	–	–	37,09	28,55	37,09	16,07
16	–	–	39,56	30,35	39,56	17,09
17	–	–	42,03	32,14	42,03	18,20^* * – deslocamento na ruptura.
18	–	–	44,50	33,94	44,50	–
19	–	–	46,98	35,73	46,98	–
20	–	–	49,45^* * – deslocamento na ruptura.	37,54^* * – deslocamento na ruptura.	49,45^* * – deslocamento na ruptura.	–

ESFORÇO	V-SR		V-PRI		V-AUT
ESFORÇO	MHSM	MEF	MHSM	MEF	MHSM	MEF
σ_c (MPa)	31,6	48,0	16,2	17,0	12,3	15,4
σ_f (MPa)	31,6	32,0	28,0	41,6	27,0	54,6

Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro, em cooperação com a Associação Brasileira do Hidrogênio, ABH2 Av. Moniz Aragão, 207, 21941-594, Rio de Janeiro, RJ, Brasil, Tel: +55 (21) 3938-8791 - Rio de Janeiro - RJ - Brazil
E-mail: revmateria@gmail.com

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