铝合金-木组合短柱轴压性能试验研究

Experimental investigation on the aluminum alloytimber composite stub columns under axial compression

文中提出了一种铝合金管-木组合柱结构,该新型组合柱由外部铝合金管、内部木柱及铝合金管和木柱之间的水泥净浆组成。进行了该新型组合短柱的轴压性能试验,试验设计参数为铝合金管壁厚、木柱直径、水泥净浆水灰比及CFRP粘贴层数等。分析了各试件的破坏形态、荷载-位移曲线、承载力、刚度、延性及应变特征等。结果表明:铝合金-木组合短柱最终破坏形态为柱中屈曲破坏和柱端屈曲破坏。荷载-位移曲线可分为弹性阶段、弹塑性阶段、屈曲阶段、破化阶段和二次上升阶段;不同设计参数对短柱试件轴压性能均会产生一定影响,其中木柱直径对承载力、刚度及延性的影响最大。最后,提出了该组合短柱承载能力计算方法,所得理论计算值与试验值符合较好。

In this study,an innovative aluminum alloytube-timber composite column structure is proposed,which includes the outer aluminum tube,inner timber and mortar.Axial compressive test was carried out on the proposed stub columns,and the test variables included the tube thickness,timber diameter,water-cement ratio of cement paste,and the number of layers of CFRP.Failure modes,load-displacement curves,strength,stiffness,ductility and strain characteristics were analyzed.Results show that the final failure modes were buckling damage in the middle of the column and buckling damage at the end of the column.The load-displacement curve can be roughly divided into elastic phase,elastic-plastic phase,buckling phase,failure phase,and secondary rising phase.The different test variables have certain influences on the compressive behavior of the stub columns,and the timber diameter has the most influence on the bearing capacity,stiffness,and ductility.Finally,a calculation method for the ultimate bearing capacity was developed,the calculated values fit well with the experiment results.