不同截面形式重组竹柱轴心受压试验研究

Experimental Study on Axial Compression of Glued Laminated Bamboo Columns with Different Cross Sections

为在重组竹结构中选择合适的柱形式,对结构胶连接的空心箱型柱以及实心柱进行轴心受压试验,考察柱抗压承载力特性、破坏模式等。结果表明,重组竹实心柱破坏模式为失稳破坏,柱中出现轻微开裂;重组竹空心柱破坏模式同样为失稳破坏,并且上下两端端部出现明显裂缝,构件两端压溃破坏,指接处也发生锯齿状断裂。重组竹实心柱极限荷载平均值为465kN,空心柱荷载平均值为418kN,实心柱极限荷载为空心柱的1.11倍,实心柱的延性系数为1.66,空心柱的延性系数为1.53,说明重组竹实心柱的承载力和延性更优。重组竹实心柱和空心柱试验值与依据《木结构设计规范》理论计算值吻合较好,说明《木结构设计规范》对重组竹柱的设计具有一定参考作用。空心柱的承载力相比于实心柱相差并不是很大,且材料用量减少,说明重组竹空心柱可在实际工程中进行应用,重量轻、施工方便。

In order to choose proper column form in the structure of glued laminated bamboo,experimental study on axial compression of glued laminated bamboo columns with different cross sections were carried out.Compression bearing capacity and failure mode of glued laminated bamboo solid columns and hollow columns were investigated.The results showed that the failure mode of the glued laminated bamboo solid columns was the instability failure,and slight cracking occurred in the middle of column;the failure mode of the glued laminated bamboo hollow columns was also the instability failure,and obvious cracks occurred in the both ends of the columns,crushing failure at both ends of the component,zigzag fault also occurred in the finger junction.The ultimate load of solid column was 465 kN,for hollow column,it was 418 kN,the ultimate load of solid column is 1.11 times as high as that of hollow column,the ductility coefficient of solid column was 1.66,1.53 for hollow column,indicating that the bearing capacity and ductility of the solid column were better.The test values were in good agreement with the theoretical values calculated according to the code for design of timber structures,it indicated that the code for design of timber structures had a certain reference effect on the design of glued laminated bamboo columns.The bearing capacity of hollow column was not much different from that of solid column,and materials to make hollow column obviously reduced the,it showed that the glued laminated bamboo hollow columns could be applied in practical engineering.