The Strength of Axially Loaded Square Hollow-Section Column Made of Laminated Asian Bamboo (Dendrocalamus asper Becker)

摘要

An experimental study on square hollow-section columns with central axial load has been conducted to find the strength of the columns. There were thirty test columns, each of them was formed by laminated Asian bamboo glued by urea formaldehyde of 2.68 N/m2 and cool compressed for 4 h at 2 MPa. The nominal size of the sectioned column was 80, 120 and 160 mm with the wall's thickness were 15, 20 and 25 mm, respectively. The thirty columns were categorized into 3 groups, namely 9 specimens of short columns, 12 specimens of intermediate columns and 9 specimens of long columns. The results of the study show that all of the short columns experienced failure due to material crushing when the pressure reached 59.08 MPa. The intermediate columns experienced three failures, namely material crushing or inelastic buckling or splitting wall of the columns, while all specimens of long columns experience failure due to elastic buckling. The ratio of the critical load of the test results and the predicted critical load by using Ylinen formula reach 0.76 to 1.45. Such results show that the Ylinen Formula can be used to design the square hollow-section column of laminated Asian bamboo.