Prestressed CFRP Reinforced Solid Web Shaped Steel Concrete Truss Experimental Study On Mechanical Performance Of Changing Structure

With the increasing demand for the functional diversity of high-rise buildings,the function of each floor of the same building varies with the height of the floor,so different structural forms need to be set up.Because of people’s demand for building function,the building layout is often opposite to the traditional building layout,that is,the upper column network is dense,and the lower column network is sparse.Therefore,in order to meet the reliable transmission of internal force,it is necessary to set up conversion components at the floor conversion.Large span prestressed solid web steel reinforced concrete transfer floor structure is a new type of transfer floor structure.Compared with the common beam transfer floor,it greatly improves the bearing capacity of the transfer floor structure,reduces the self weight of the structure and has the advantages of clear transfer way.The ductility and bearing capacity of the transfer floor structure are increased to avoid the brittle failure of the transfer floor structure.Because there are few researches on the transfer story of full web steel reinforced concrete truss at home and abroad,and most of them are theoretical researches,this paper studies it through the method of combining experimental research and theory,and provides the corresponding basis for the future engineering practice.The main research of this paper is as follows:Through consulting the references,it is found that the lower chord and web member of the transfer floor of some solid web trusses are under tension.Because the members are easier to be damaged in tension than in compression,this paper studies the influence of different prestressing forces on the tie rod by tensioning the prestressed CFRP bars of different prestressing degrees in the transfer floor of two solid web prestressed steel reinforced concrete trusses,and analyzes the upper chord The strain of bottom chord,tension web,compression web,side column reinforcement and section steel.the strains of the bars and sections increase with the increase of the load,and the strains of the bars and sections change slowly at the initial stage of loading,and the strains of the bars and sections at the later stage of loading Change is accelerating.Based on the analysis of the upper chord deflection and the lower chord deflection of the transfer story,the development trend of the upper chord deflection and the lower chord deflection in different stress stages are obtained.In this paper,based on the test results of two solid web prestressed steel reinforced concrete truss transfer story,the finite element simulation analysis of the transfer story is carried out by ABAQUS finite element software,and the failure mode of the transfer story,and the finite element model is more reliable,which provides the corresponding numerical simulation basis for the future practical engineering.