Effect of nodes on mechanical properties and microstructure of laminated bamboo lumber units. (18th October 2021)

• Record Type: Journal Article
• Authors: Zhang, Han; Li, Haitao; Li, Yanjun; Xiong, Zhenhua; Zhang, Nini; Lorenzo, Rodolfo; Ashraf, Mahmud
• Is Part Of: Construction & building materials. Volume 304(2021)
• Publication Date: 2021-10-18
• Subjects: Laminated bamboo lumber units -- Bamboo nodes -- Mechanical properties; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2021.124427
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Nodes effect on the mechanical properties of LBL units was studied by experiments. Failure modes of LBL units under compression, tension and shear were analyzed. The stress–strain relationship models of LBL units were studied. Bamboo nodes showed considerable adverse effect on tensile properties of LBL units. Abstract: Mechanical properties of laminated bamboo lumber (LBL) units with and without nodes were experimentally studied under various loading conditions such as compression along parallel and perpendicular to the grain as well as tension and shear along parallel to the grain direction. Small specimens were carefully manufactured from Moso bamboo investigate to the effect of nodes on key mechanical properties including strength, ductility, elastic modulus and failure modes under considered loading cases. Results showed that nodes clearly have some beneficial effect on compression resistance of LBL units, albeit the effect is dependent on grain direction. On the other hand, the presence of nodes showed an adverse effect on the tensile resistance but did not have any meaningful effect on shear resistance. Elastic modulus under different loading conditions was also affected due to the presence of nodes. The behavior of LBL units under compression and shear were nonlinear and showed good agreement with Ramberg-Osgood type analytical models when calibrated using obtained results. In addition, the microstructure of LBL units was scanned using an electron microscope and it was obvious that those units are a two-phase composite material like natural bamboo.