Experimental Investigation on Bending Creep Properties of Hybrid Cross-laminated Timber Fabricated from Lumber and OSB

Given the nature of cross-laminated timber (CLT) with the orthogonal arrangement of layers, CLT is more prone to time-dependent deformation than other engineered wood, such as glulam. In order to explore and improve the bending creep properties for CLT, a 90-day bending creep test was carried out and the creep development law was analyzed for Hybrid CLT (HCLT) fabricated from SPF lumber and construction oriented strand board (COSB). The power law model was used to predicted the 50-year relative creep values for CLT and HCLT specimens. The results showed that the HCLT composed entirely of COSB panels had the largest relative creep (1.99). The HCLT that used COSB only as the transverse layer showed the best long-term bending creep performance, which relative creep was 0.36, and was smaller than regular CLT (0.86), demonstrating the potential for engineering applications.