Structural performance of full-scale hybrid hollow core wall with WPVC composite materials under axial compression load via experimental investigation

This study compares the structural performance of the load-bearing capacity of hollow core walls produced from thermally modified rubberwood to hybrid hollow core walls consisting of thermally modified rubberwood and WPVC composite material. The wood-WPVC material adhesive efficiency was evaluated through a bonding shear test to select adhesives for manufacturing hybrid hollow core walls. Full-scale hybrid hollow core walls of varying slenderness ratios were subjected to an axial compression load test to assess their ultimate stress, lateral deflection, and failure characteristics. The experimental results demonstrated that the epoxy adhesive Sikadur-31 CF normal provided the highest bonding efficiency, making it the most suitable choice for assembling hybrid hollow core walls. The hybrid hollow core wall exhibited a 24.85 % lower load-bearing capacity than the thermally modified rubberwood hollow core wall. However, it demonstrated superior lateral deflection in a continuous single curve of the wall panel, as well as improved thermal insulation properties and higher costeffectiveness compared to the TRH-wall. Additionally, the increasing slenderness ratio of the wall panel led to a decrease in the ultimate stress of the hybrid hollow core wall under compression loading. The prediction model for the ultimate stress across varying slenderness ratios showed good agreement with the experimental results. Overall, this study suggests that hybrid hollow core walls can be used for structural building applications, particularly for applying loads in two-story buildings and roofs with spans exceeding four meters in one-story houses.