Study on Reinforcement Measures for Wood Composite Beams with Discontinuous Cross-Section in Web Opening

• Published in: Forests Vol. 15; no. 8; p. 1318
• Main Authors: Wu, Haoxuan, Liao, Wenyuan, Yu, Yue, Dai, Bihui, Chen, Zhiqiang, Chai, Hangbin, Lv, Xinliang
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.08.2024
• Subjects: Bearing capacity; Bearing strength; Boundary conditions; Carrying capacity; Composite beams; Composite materials; Deformation effects; Finite element analysis; Force distribution; Internal forces; Load; Load carrying capacity; Load distribution; Materials; Mechanical properties; Plywood; Reinforcement; reinforcement measures; Shear forces; shear stresses; Stress concentration; Stress distribution; structural opening; Thin wall sections; Timber; Web openings; Wood; wood composite beam; Wood composites; Wooden beams; Yield stress; China
• ISSN: 1999-4907; 1999-4907
• DOI: 10.3390/f15081318

On the basis of existing experimental studies on web-opening wood composite beams, six new types of reinforcement were proposed in this study. The effects of different reinforcement measures on mechanical properties such as the load-carrying capacity, deformation capacity, internal force distribution law, and force transfer mechanism of web-opening wood composite beams were investigated. The results show that the stress distribution in the opening area is more uniform after reinforcement, and the influence of different reinforcement measures changes the damage mode of the whole beam. The setting of reinforcement measures in the opening area can effectively inhibit and slow down the generation and development of the cracks in the opening area of the web opening and reduce the negative influence of the composite beam caused by the opening. With reinforcement, the allowable and ultimate bearing capacity of wood composite beams can be increased by 3%~21% and 28%~59%; the redistribution of shear force occurs in the opening area after reinforcement, and plywood and cold-formed thin-walled section (CFTWS) help to bear 14%~76% of the value of shear force in the opening area. The most effective reinforcement measures are bolts–epoxy–CFTWS.