Experimental And Analytical Research On Structural Parallel Strand Bamboo Column In Frame Structure

With the rapid development of national economy, the contradiction between wood supplyand demand becomes more prominent. And therefore, accelerating the timber saving, findingsubstitute materials and advocating replacing wood with bamboo have been importantpolicies of the country. China, a country rich in bamboo, has the highest bamboo resourceownership and quality in the world. The strength of bamboo is higher and even beyond thewood, so the bamboo can be made into bearing component by secondary development andapplied to the field of modern bamboo building structure.In the paper, based on experimentalresearch and numerical simulation analysis of composite material restructuring bamboocolumns, the strength and axial compression tests were carried out to analyze mechanicalperformance of structural parallel strand bamboo and the seismic performance of bamboo framestructure system was studied, in order to make parallel strand bamboo get its popularization andapplication in the field of building structure.The main research contents and conclusions can belisted as follows:(1) The mechanical behaviors of anisotropic structural parallel strand bamboo columnwere studied and ultimate compressive stress and nine elastic parameters of structural parallelstrand bamboo were acquired.(2) The mechanical behaviors and failure mode of structural parallel strand bamboocolumn were discussed under the condition of different slenderness ratios. When theslenderness ratio was in the range of14to28, the strength failure occurred in short columns dueto the unbearable increasing load. When the slenderness ratio was in the range of35to62, theunstable failure occurred in long columns due to big unidirectional or bidirectional bendingdeflection.(3) By comparison between experimental values and calculated values obtained from thedesign formulae, it was advisable to calculate ultimate bearing capacity of structural PSB axialcompression columns according to USA "NDS2005".(4) By testing the ductility coefficient of short columns, structural parallel strand bamboocolumns were found to possess better deformability and energy dissipation capacity.(5) The finite element analysis software, ANSYS was used to carry out nonlinear bucklinganalysis on structural parallel strand bamboo columns. The simulation results of nonlinearbuckling analysis and experimental results were fitting relatively better in the three aspects:ultimate bearing capacity, load-transverse mid-span deflection curve and failure mode, whichshowed that it was feasible to utilize numerical simulation analysis method to test themechanical behaviors of structural parallel strand bamboo columns. (6) The general finite element analysis software, MIDAS/Gen was used to estimateseismic behaviors of the two-floor bamboo frame structure houses. Through dynamictime-history analysis, the two-floor bamboo frame structure houses could meet the requirementsof current standards and it indicated that structural parallel strand bamboo frame structuresystem had great seismic behavior.From the dissussion above, it can be seen that the structural parallel strand bamboocolumns could meet the requirements of building structure on the mechanical behaviors ofmaterials. It also indicated that structural parallel strand bamboo columns could be applied inthe field of modern bamboo building structure, especially in the seismic fortified area andreconstruction engineering of disaster areas.