Experimental Rasearch And Finite Element Analysis Of GluBam Columns Under Axial Compression

Modern laminated bamboo makes the plank stuff which is made of glued sawali applied in architecture field for the first time. Laminated bamboo has good mechanical property as well as good manufacturing property so that it is very suitable for application in architecture field. Former experimental and engineering examples prove that it can be well applied in the production of structural components. The ratio of strength and weight even surpasses that of steel or wood. So, it has great prospects for development. In this paper, the axial compression test and finite element analysis of laminated bamboo column has been mainly studied. The details of the research is stated below.At first, the experiment for the axial compression test of laminated bamboo columns has been designed. There are five groups in the test which have the same cross section(56mm×56mm) and are different in length and width. The experimental equipment and steps are presented, too. The test results are compared with China timberwork design standard , Uniform Building Code and National Design Specification. After analyzing the experimental data, the relationship of the strain versus load under different slenderness has been obtained; the relation of the horizontal deflection of each surfaces versus load has also been studied; at the same time, the experiment study the variation of maximum lateral strain and longitudinal strain versus the different slenderness ratio .Then, according to the model of laminated bamboo columns which is tested above, the eigenvalue buckling analysis are carried out under axial loading by using ANSYS. The bearing capacity in the first order mode has been compared with the experimental value, the results have great agreement; the shape in the first order mode is a half sine wave from the analysis which is similar with the theory.In the next, the nonlinear buckling analysis of laminated bamboo columns which are axial compressed has been carried out. Under large deformation are considered in the maximum lateral deflection of the initial defects in the relative ratio of the length of the specimen. When the load is greater than 1.1Pcr, the influence of initial defect is less, the difference between this ratio and theoretical value is less than 1%, which is shown great agreement, and verified the feasibility of the nonlinear buckling analysis by using ANSYS . At last, several problems about laminated bamboo which need to be solved in next step has been put out , and its development situation are discussed.