Slenderness Ratio Effect on the Eccentric Compression Performance of Chamfered Laminated Bamboo Lumber Columns

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.

Mechanical evaluation on BFRP laminated bamboo lumber columns under eccentric compression

“…Table 3 shows the increase rate of ultimate load ( P ), ultimate axial displacement ( s ), ultimate lateral displacement ( ω ) and ultimate bending moment ( M u) in mid-span of BFRP reinforced columns under eccentricities of 30 mm, 60 mm, 90 mm and 120 mm, as compared with unreinforced specimens with the same eccentricity. The data of unreinforced specimens came from the references of specimens produced by the same manufacturer (Zhou et al, 2022).…”

Evaluating the ultimate bearing capacity of glued laminated bamboo hollow columns under eccentric compression

“…The common forms of equations for deflection curves include quadratic polynomial function, half-wave sine function, half-wave cosine function, etc. (Hong et al 2021;Zhou et al 2022). The fitting curves with quadratic polynomial functions and sinusoidal functions are shown in Figs.…”

Research and Application Progress of Straw

“…Straw can be absorbed and utilized by livestock such as cattle and sheep due to the high crude fiber content (30%-40%) and nutrient-rich cellulose, hemicellulose and lignin [19][20][21][22]. Physical treatment, chemical treatment and biological treatment [23][24][25][26] are usually used to treat crop straw to improve the nutritional value of straw and reduce the waste of straw feed resources, so as to achieve the goal of green economy and sustainable development. At the same time, straw-based wood-based panels also have good mechanical properties, and have received extensive attention in the use of building materials.…”