| Because concrete-filled steel tubes can adapt to the development trend of modern engineering and meet the construction requirements of modern engineering,the application of concrete-filled steel tube members in high-rise buildings,underground engineering,bridge engineering and large transmission tower structures is more and more extensive.Concrete-filled steel tube makes full use of the material advantages of both steel and concrete,combining the high tensile strength of steel with the high compressive strength of concrete,so that concrete-filled steel tube structure has the advantages of strong bearing capacity,good ductility and seismic performance.At the same time,with the wide application of concrete filled steel tube structure,it is affected by environmental factors and natural disasters,the external steel is vulnerable to corrosion and external impact caused by the reduction of bearing capacity,affecting the safety of the structure.Therefore,reinforcement and repair of concrete-filled steel tube structures will become the focus of research at present.Carbon fiber reinforced plastics(CFRP)is a kind of common reinforcement material,which has the characteristics of light weight,high strength and good designability.Cfrp-concrete-filled steel tube members refer to the outsourcing of CFRP materials to the concrete-filled steel tube column,thus making the concrete in the steel tube under the dual constraint of steel tube and CFRP.CFRP confined concrete-filled steel tube(CFST)can not only improve the bearing capacity of concrete-filled steel tube(CFST),but also better protect the steel tube from corrosion by outsourcing CFRP,which makes up the deficiency of CFST structure.At present,researches on CFRP-concrete-filled steel tubular structures at home and abroad mainly focus on the static force and hysteretic analysis under the action of a single force.In this paper,the bending and torsional properties of cfrp-concrete-filled steel tube are studied by means of experimental study and ABAQUS finite element simulation.The experiment designed a total of 9 CFRP-Concrete-filled steel tube.It can be seen from the experimental results that before CFRP cracking,the steel tube and CFRP work together.With the increase of CFRP layers,the bearing capacity of the specimen increases slightly,but the stiffness of the specimen does not increase much.The finite element analysis software ABAQUS was used to establish a model for the bending and torsional properties of circular CFRP-concrete-filled steel tube.The experimental curves were compared with the simulated curves,and the results were in good agreement. |
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