Studies On Dynamic Performance Of Prestressed Steel-concrete Composite Beams

Steel and concrete composite structure is applied in the field of construction more and more widely at present, it is due to good performance of composite structure.Steel-concrete conposite beam is make steel and concrete that all have good performance connected together to form a whole by shear connectors,through the reasonable design play the advantages of both, namely,full play the compressive performance of concrete and the tensile properties of steel in the composite structure.Make the full use of material performance,so as to save materials, enhance economic efficiency,the purpose of save energy.Prestressed steel-concrete beams is on the basis of steel-concrete composite beams,make the prestress technology and composite beams together.Through make the prestress and composite beams together to improve the performance of the composite beams and prestressed technology can reduce cross-section height of beam and save material,reduce cost at the same time,can adjust the internal force distribution of the structure,increase the elasticity scope of work of beams,delayed the time of composite beams yield and improves the performance. In all aspects on the basis of steel and concrete composite beams is more superior.Based on the existing relaed research of prestressed steel-concrete composite beams can known that there have some impact on the performance of the main factors include:the performance of different materials,distributions of externally prestressed reinforcement,distributi-ons of shear connectors and number,the size of the external prestressing,etc.In order to eliminate the influence of various factors,this article use the various parameters of the test model to make finite element model by ABAQUS finite element software.By applying reciprocating loading according to the test,can work out hysteresis curves,energy dissipation capacity,skeleton curve,stiffness degradation,ect.Establish a reasonable finite element model by comparison with the test model;Second,by changing the size of the external prestressing,concrete strength,quantity and distribution of shear connector,the kind of steel,distributions of externally prestressed reinforcement to study these factors'impact on the performance of the prestressed composite beams when validation the finite element models is right;Once again,compares prestressed steel-concrete composite beams and steel-concrete composite beams under reciprocating loading,research performance advantage of prestressed steel-concrete composite beams.