Axial compressive properties of intermediately slender circular ancient timber columns reinforced with high-performance bamboo-based composites

Abstract

The use of circular, medium-length timber columns reinforced with high-performance bamboo-based composite (HPBBC) is a sustainable reinforcement method without damage. This study conducted axial compression tests on seven circular medium-length wooden columns strengthened using the sustainable reinforcement method with different HPBBC materials and reinforcement thicknesses. The test results revealed that bamboo scrimber with Sinocalamus affinis fibers (BSS) of 10, 20, and 30 mm thicknesses, respectively, increased the supplementary load-bearing capacity by 29.30 %, 85.74 %, and 153.68 % compared to unreinforced wooden columns. The transverse deformation of the wooden columns destabilized the reinforcement system when the high-stiffness BSS was used as reinforced materials. In contrast, the wooden columns were destabilized broken by the transverse deformation of the hollow structures made of laminated bamboo lumber (LBL) and bamboo scrimber with Moso bamboo fibers (BSM). Using reinforcing materials with good stiffness can prevent the destabilization of timber columns. Based on the damage model, an equation of the load-bearing capacity of sustainable reinforcement wood columns based on the buckling stress of the columns was proposed. The calculated results revealed that the equations proposed in this study agree with the test result when the Euler buckling stress is used.