Axial Compressive Behavior of Combined L-shaped Steel Tube Recycled Concrete Short Columns

In order to study the axial compression performance of the composite L-section steel tube recycled concrete columns, 13 finite element models of the composite L-section steel tube recycled concrete columns are established in this paper(12 of which are composite L-section columns and 1 of which is ordinary L-section columns). The failure mode and axial compression capacity of the composite L-section steel tube recycled concrete columns are analyzed, and the axial compression performance of the composite L-section steel tube recycled concrete columns is compared with that of the ordinary L-section steel tube specimens. The influence of recycled aggregate replacement ratio, section length width ratio, steel tube thickness and recycled concrete strength grade on the axial bearing capacity of composite L-shaped steel tube recycled concrete short columns is studied. The results show that the failure mode of the specimen is the central buckling failure, the composite L-shaped recycled concrete-filled steel tube column has higher ultimate bearing capacity and better axial compression performance than the ordinary L-shaped recycled concrete-filled steel tube column, the change of the replacement rate of recycled aggregate has no obvious influence on the axial compression performance of the component, the thickness of the steel tube and the strength grade of the recycled concrete can be obvious the ultimate bearing capacity of the specimen. The change of length-wide ratio in certain range is beneficial to the improvement of Axial bearing capacity.