Abstract:Modern factory automation is enabling the economic production of timber building components with sophisticated integral mechanical joints. This paper investigates the governing compressive failure mechanisms of full-length integrally-jointed plywood box columns, and in particular seeks to understand the interaction between localized material knot defects, integral box joint capacity, and column strength. A new critical failure mechanism is identified based on experimental observations and numerical analysis of… Show more
“…Assuming global stability can be preserved through such geometric stiffening, the strength of the system is predicted to be governed by the strength of joints under hogging action. Potential failures could be (1) tensile tearing of the FRP layer; (2) compressive rupture in the timber segment; or (3) some local stability failure in the segment itself, for example local buckling in longitudinal plates or pop-off of integrally-attached inside face plates [36,37].…”
“…Assuming global stability can be preserved through such geometric stiffening, the strength of the system is predicted to be governed by the strength of joints under hogging action. Potential failures could be (1) tensile tearing of the FRP layer; (2) compressive rupture in the timber segment; or (3) some local stability failure in the segment itself, for example local buckling in longitudinal plates or pop-off of integrally-attached inside face plates [36,37].…”
“…Xin [15] et al investigated the compression failure mechanisms of full-length integrally connected plywood box columns, focusing on the interaction between knot defects, the overall box joint capability, and column strength. Through experimental observations and numerical analysis of different-sized knot defect sections, they identified a new critical failure mechanism, where the column load was controlled by the lateral load of the overall box-shaped joint caused by knot defects.…”
FRP reinforcement technology, with its numerous outstanding advantages, has been widely applied to the strengthening of timber column structures, making related research of significant social and engineering practical relevance. This paper reviews the research achievements in the axial compression performance of FRP-reinforced timber columns from both domestic and international sources. It analyzes advancements in four aspects: types of FRP, number of FRP layers, the impact of knots, and models of ultimate compressive strength and finite element models. A comprehensive analysis and comparison of existing research shortcomings and unresolved issues are provided. Finally, some references and suggestions for further research and application of FRP-reinforced timber columns are offered.
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