Researchon On Axial Compression And Seismic Performance Of Composite L-shaped Steel Tube Recycled Concrete Column

As a composite component,the steel tube recycled concrete column can take advantage of the performance of the two materials of steel tube and recycled concrete.The component has high strength and good ductility.At the same time,the waste concrete can be effectively used to reduce construction costs and meet the needs of current green development.Special-shaped concrete-filled steel tube columns conform to the needs of building development,can effectively avoid indoor corners,increase indoor use area,and make indoor layout more flexible.The combined special-shaped concrete-filled steel tube column is welded by a rectangular steel tube and a U-shaped steel tube.The forming is accurate,which can effectively avoid the problem of serious deformation of the negative angle of the traditional special-shaped special-shaped concrete column.less.In this paper,the ABAQUS software is used to perform finite element simulation analysis on the axial compression performance and seismic performance of the combined L-shaped steel tube recycled concrete short column.The main research contents and results are as follows:(1)Establishment of combined L-shaped steel tube recycled concrete column finite element: According to the stress-strain relationship of steel tube and core recycled concrete,the stress-relationship relationship of core recycled concrete under the constraint of combined L-shaped steel tube is established,and the combined L is established using ABAQUS software Finite element model of shaped steel tube recycled concrete column.(2)Finite element analysis of axial compression performance of composite L-shaped steel tube recycled concrete short column: In this paper,14 L-shaped steel tube recycled concrete axial compression column finite element models(of which 13 are combined L-shaped cross-section specimens,1 It is an ordinary L-shaped cross-section specimen),the axial compression failure form and axial bearing capacity of the combined L-shaped steel tube recycled concrete column are analyzed,and compared with the ordinary L-shaped steel tube recycled concrete column to study the replacement of recycled aggregate The influence of the rate,the core concrete strength grade,the length-to-width ratio of the section and the thickness of the steel tube on the axial compression bearing capacity of the combined L-shaped steel tube recycled concrete short column,the axial compression bearing capacity of the specimen calculated by the finite element calculation and the domestic and foreign codes are calculated The axial compression bearing capacity of the specimens was compared and analyzed,and the calculation formula of the axial compression bearing capacity of the combined L-shaped steel tube recycled concrete short column was given.(3)Finite element analysis of the seismic performance of composite L-shaped steel tube recycled concrete columns: In this paper,15 finite-element models of L-shaped steel tube recycled concrete columns under low-cycle repeated loads were established(of which 14 were combined L-shaped cross-section specimens,One is an ordinary L-shaped cross-section specimen).The seismic performance of the combined L-shaped cross-section specimen and the ordinary L-shaped cross-section specimen is compared and analyzed.The replacement rate of recycled aggregates,the thickness of the steel pipe,the axial compression ratio,the concrete strength and the level are studied.Effect of load loading direction on seismic performance of composite L-shaped steel tube recycled concrete column.