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Evaluation of OSB webbed laminated bamboo lumber box-shaped joists with a circular web hole

2019; Elsevier BV; Volume: 29; Linguagem: Inglês

10.1016/j.jobe.2019.101129

2352-7102

Guo Chen, Jing Wu, Hao Jiang, Tong Zhou, Xiang Li, Yunfei Yu,

Natural Fiber Reinforced Composites

Openings are frequently required in the web of oriented strand board (OSB) webbed laminated bamboo lumber (LBL) box-shaped joists for passage of service ducts, plumbing, and wiring. A total of 105 joists with a circular web hole were tested and compared with 7 joists without a web opening (control joists). It was found that for smaller circular holes (D/hw ≤ 30%), the effect of the hole was negligible and did not cause strength and stiffness reductions. The unreinforced joists with larger web holes (D/hw>30%) failed in a brittle and sudden shear mode, resulting in a reduction in strength. Reinforcing of joists with an opening to stop or prevent crack formation or propagation could be accomplished by using one of three methods including collar shaped oriented strand board patches (C-OSB), two “U” shaped oriented strand board patches (TU-OSB), or collar shaped steel patches (C-SP). Results showed that the C-OSB worked most effectively and returned 2 of 5 series of joists to a strength and stiffness equivalent to the “no hole” condition. The mechanical performance and deformation properties of joists with a web opening could be improved by C-SP, but the improvement was only a small percentage of the total load-carrying capacity. TU-OSB worked effectively for a limited opening diameter (D/hw ≤ 50%), and was easier to install without removing the service pipes and less expensive than the C-OSB or C-SP options. Good correlation was obtained between experimental results and numerical simulations.