Research On Mechanical Properties Of GFRP-Concrete-Steel Double Skin Tubular Long Columns Under Axial Compression

GFRP-concrete-steel double skin tubular columns is a new type of composite components,it consists of three parts: the outer GFRP tube,the inner steel tube and the concrete between them,it has all the advantages of double GFRP tube concrete composite column,double steel tube concrete composite column and GFRP tube core concrete column.GFRP tube can improve the bearing capacity of the composite components by restricting the core concrete.At the same time,GFRP tube can effectively protect concrete and steel tube.The composite column has good ductility and seismic performance.It can be seen that the combined structure has broad application prospects.At present,the research on GFRP-concrete-steel double skin tubular long columns is relatively deficient.In order to study the mechanical properties of GFRP-concrete-steel double skin tubular long columns,this paper will build up the finite element model of GFRP-concrete-steel double skin tubular long columns,On the basis of verifying the correctness of the model,study in depth the influence of four kinds of parameters,such as hollow ratio,height to diameter ratio,concrete strength and thickness of GFRP tube on the mechanical properties of the composite components.Main research work includes:1.Design the cross-section forms of GFRP-concrete-steel double skin tubular long columns.2.Through the finite element software ANSYS,combined with the test component parameters,establish the finite element model of the corresponding GFRP-concrete-steel double skin tubular columns,By comparing the ultimate bearing capacity and loaddisplacement curve to verify the correctness of the constitutive relation and the modeling method.3.Extended parameter,determine the parameters of the working conditions to be studied,establish the finite element model,obtain the bearing capacity of GFRP-concrete-steel double skin tubular columns by controlling hollow ratio,height to diameter ratio,concrete strength and thickness of GFRP tube.4.Basing on the results obtained by finite element simulation,determine the effect law of the above four factors of GFRP-concrete-steel double skin tubular long columns.5.Determine the reasonable hollow ratio,height to diameter ratio,concrete strength and thickness of GFRP tube.Some suggestions are presented for engineering design.