In-plane compressive behavior of short cross-laminated bamboo and timber

Abstract

This study investigated the post-yield behavior of 5-layer cross-laminated bamboo and timber (CLBT) short wall specimens under in-plane compressive loading, and cross-laminated timber (CLT) specimens were used as the control. Compared to CLT, the replacement of the outermost spruce-pine-fir layers in CLBT with bamboo scrimber layers led to a 90% increase in compressive strength and a 20% increase in compressive modulus in the major strength direction. A quantitative evaluation employing absolute and relative error indicators demonstrated that the Richard-Abbott model adequately predicted the tested stress–strain relationships. In contrast to CLT, CLBT exhibited a more extended strain hardening stage after yielding and a shorter strain softening stage after the maximum point, particularly in the major strength direction. The ductility and toughness indices of CLBT, calculated based on the yield and failure points, were higher than those of CLT in the major and minor strength directions. The energy absorption provided a better representation of toughness characteristics for CLBT and CLT compared to the toughness index. This study provides a technical database and guidelines for the application of mass hybrid bamboo and wood products in the construction industry.