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Axial compressive behavior of FRP‑confined laminated timber columns

Wang Libin, Shi Feng, Zhao Min, Wang Brad Jianhe, Li Hao, Zou Xingxing, Du Hao

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 1

art. no. e28, 2024

Glued-laminated timber (GLT) and cross-laminated timber (CLT) have shown great potential in the field of sustainable structures (i.e., beams, slabs and floors). However, GLT and CLT columns are mostly considered as medium–low grade construction materials with a worse structural integral than timber columns. It is crucial to improve the performance of existing timber members to make the structures more acceptable for engineering applications. This study investigated the axial compressive behavior of GLT and CLT columns confined with fiber-reinforced polymer (FRP) sheets. To compare the mechanical properties of this composite structure, twenty groups of laminated Canadian hemlock column specimens were prepared using different FRP types and layer numbers, and two height dimensions were adopted for those columns to evaluate the scale effect. The failure modes of laminated timber columns were significantly influenced by the confinement of FRP, including timber crushing failures, FRP cracking failures and longitudinal buckling failures. According to the load– displacement curves, the load carrying capacity of FRP-confined laminated timber columns were improved by 6.35–36.19% compared with the unconfined specimens. Moreover, the FRP layers could prolong the plastic post-peak failure process. Inspired by confined concrete structures, three analytical predictive equations were derived for ultimate compressive strength.