箱格式L形钢管混凝土短柱轴压力学性能研究

Behavior of box-type L-shaped concrete-filled steel tubular short columns subjected to axial-compression

在原有L形钢管混凝土的基础上,提出了箱格式L形钢管混凝土柱,所谓箱格式即是在L形截面的角部加入纵横两块竖向钢板,将原有L形截面分隔为规则的矩形截面,这样不仅可以有效地提高构件竖向承载力,而且也增加了构件的稳定性,避免了角部因局部应力过大造成构件提前破坏,承载力降低的现象,同时也提高了构件的延性性能。本研究利用有限元软件ABAQUS建模对箱格式L形钢管混凝土短柱轴压时的力学性能进行了非线性分析,给出了其荷载-位移曲线和钢管的荷载-应变曲线,建模时充分考虑了构件的长宽比和宽厚比对L形钢管混凝土短柱承载力及延性性能的影响。

The box-type L-shaped concrete-filled steel tubular short column was proposed on the basis of l-shaped concrete-filled steel tubular column,the so-called box-type,that is adding vertical and horizontal two pieces of steel plates in corner of the L-shaped section,that was divided into regular rectangular sections,this not only improved the vertical bearing capacity of specimen effectively,but also increased its stability,and the phenomenon of early damage for specimen due to local excessive stresses,decrease of carrying capacity can be avoided,meanwhile that also increases the ductility of the component.Made a nonlinear finite-element analysis for the mechanical performance of the box-type L-shaped concrete-filled steel tubular short column under axial pressure by finite element software ABAQUS,the load-displacement curve of specimen and load-strain curve of steel tube were presented.The influence of width-thickness ratio of steel tube and length-width ratio of specimen cross-section on bearing capacity and ductility performance for specimen have been fully taken into account in their modeling.