重组竹柱偏心受压力学性能

Mechanical performance of glulam bamboo columns under eccentric loading

为了研究偏心距对重组竹柱的偏心受压力学性能的影响,对6根不同偏心距的重组竹柱进行了偏心受压试验。结果表明：在偏心载荷作用下,试件破坏形态主要表现为柱身中部竹材纤维受拉断裂;随着相对偏心距的增大,峰值载荷减小,而对应峰值载荷时试件的竖向位移和中部截面侧向挠度增大,弯曲变形越加显著,对应峰值载荷时,重组竹柱偏心受压试件的竹材压应变远远大于轴心受压试件,前者是后者的3.1-4.6倍,偏心受压重组竹柱的受压侧竹材的受压变形能力及强度得到了充分的发挥;基于试验结果与理论分析,提出了重组竹柱偏心受压承载力计算方法,平均绝对误差小于5%,计算结果与试验结果一致。

To study the influence of eccentricity on eccentric compressive mechanical performance of glulam bamboo columns,six glulam bamboo columns were tested under eccentric loading.The results show that the failure modes of specimens mainly display as tensile fracture of bamboo fibers in the middle region of columns under eccentric loading.With the increase of eccentricity ratio,the peak load reduces,whereas axial displacement and lateral deflection at the middle cross-section corresponding to the peak load increase,and the flexural deformation is significant.At the peak load point,the bamboo compressive strain of eccentric compression specimens is much greater than that of axial compression specimen,the former is 3.1-4.6times that of the latter,and the compressive deformation ability and strength are developed fully in the compression zone for glulam bamboo columns under eccentric loading.Based on the testing results and theoretical analysis,the calculation methods to predict the ultimate bearing capacity of the glulam bamboo columns under eccentric compression was proposed,and the mean absolute error is less 5%indicating that the calculated results are consistent with the testing results.