Fire resistance of GLB columns under axial and eccentric compression: Experimental and numerical investigation

Due to its carbon-sequestering, and renewable properties, glued laminated bamboo (GLB) holds significant potential as a structural material. However, its combustibility raises concerns about its fire resistance. This paper uses experimental and numerical investigation to study the compressive performance of GLB columns exposed to four-side fire exposure following the ISO 834 standard curve, considering the effects of different slenderness ratio, load ratio, and eccentricity. It is found that for GLB columns subjected to axial compression, the fire resistance decreases with increasing slenderness ratio and load ratio. For GLB columns under eccentric compression, the fire resistance shows a slight decline as the eccentricity increases. The failure mode is dominated by fiber rupture on the tensile side. The thermo-mechanical coupling analysis accurately simulated the temperature distribution and mechanical behavior of GLB columns, with errors for charring depth and fire resistance both within 10 % between experimental and simulated results. This study reveals the failure modes and fire resistance of GLB columns under compression, and provides essential theoretical and practical references for designing and fireproofing GLB structures.