钢-竹组合箱形柱的偏心受压力学性能

以偏心距、长细比、有无螺钉加固为参数,对36根钢竹组合箱形柱进行了偏心受压试验,分析了组合柱的破坏形态、侧向挠度、变形和承载力,研究了组合柱偏心受压力学性能的影响因素;另外,根据纤维模型法编制了非线性计算程序,对组合柱进行非线性全过程分析.结果表明:长细比较小组合柱的破坏由牛腿区域竹胶板劈裂和钢材屈曲所导致,长细比较大组合柱的破坏由中部竹胶板劈裂向外鼓起所导致;在设计参数范围内,偏心距对组合柱的力学性能影响较大,螺钉加固连接对组合柱的屈服承载力和极限承载力均有一定的提高作用,长细比有一定影响但无明显的规律性;由程序求得的计算结果与试验结果吻合较好,误差均在10%以内,表明所建立的计算模型具有较高的精度.

Mechanical Performance of Steel Bamboo Combination Box Column Under Eccentric Loading

Experimental study of eccentric compression of 36steel bamboo combination box columns was carried out by mechanical parameters of the eccentricity, aspect ratio and with or without screw. The destructive pattern, lateral deflection, deformation and bearing capacity of the combination column were analyzed and the main factors affecting mechanical performance under eccentric compression of them were also discussed. There gives a nonlinear whole process program analysis using nonlinear analysis program based on fiber model method. The results show that the damage of the different eccentricity specimens with smaller aspect ratio is caused by the splitting of the bamboo and the buckling of the steel. The damages of the lange aspect ratio specimens are caused by the splitting of bamboo in the middle of the column. Within the design parameters, the eccentricity has a great influence on the mechanical properties of the composite column. The screw reinforcement connection has a certain effect on the yield bearing capacity and ultimate bearing capacity of the specimens. The change of aspect ratio has certain effect but no obvious regularity. The calculation results obtained by the program agree well with the experimental results, their errors are within 10%, which indicates that the established calculation method has high accuracy.