Abstract
Eccentric compression tests on 15 chamfered laminated bamboo lumber (LBL) columns with a height ranging from 600 to 3000 mm were conducted in order to study the eccentric mechanical performance. The failure of all specimens was caused by the crack of bamboo fiber in the tensile region. When the ultimate strength was reached, except specimens with a height of 600 mm, all other specimens could bear large deformation, showing good ductility. The lateral displacements of the specimens under eccentric compression were approximately parabolic in the direction of column height. The ultimate bending moment of LBL columns with different slenderness ratios under compression with the same initial eccentricity was a fixed value. The relationship between ultimate capacity, axial displacement, lateral displacement, and slenderness ratio was analyzed based on test results. It was found that the plane section assumption could be used to express the stress and strain distribution of chamfered LBL columns under eccentric compression. A method for calculating the ultimate bearing capacity was proposed using a constitutive model based on the Ramberg-Osgood relation and the empirical formula for calculating the ultimate capacity was given on the basis of the former research as well as the test results in this paper.
Highlights
With the rapid development of modern society, sustainable buildings made of timber or bamboo-based materials are more and more popular because of the high demand for a better living environment for human beings
Wang et al [24] analyzed the influence of bamboo nodes on the tensile properties parallel to the grain of side press-laminated bamboo lumber and found that Laminated bamboo lumber (LBL) could well meet the physical and mechanical requirements of practical applications
Mahdavi et al [26] found that the stiffness of LBL was comparable to that of wood, showing that LBL can be used in building structures
Summary
With the rapid development of modern society, sustainable buildings made of timber or bamboo-based materials are more and more popular because of the high demand for a better living environment for human beings. Existing investigations [35] on the compression and bending properties of columns with different eccentricities were relatively comprehensive, while the studied slenderness ratios [36] were only ranging from 29 to 59, which cannot meet the size requirements in structural applications. It was not an easy thing to produce big structural elements Even though it was no problem for make longer structural members the mechanical properties were not stable, and that was why the slenderness ratio values for the former research were less than 60. As there is still no design codes for laminated bamboo lumber buildings, it is meaningful to continue the former research and investigate the eccentric compression properties with bigger slenderness ratios which are close to the real construction site. This paper will study the mechanical properties of chamfered LBL columns with slenderness ratios from 21 to 106 under eccentric loading
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