Research On Seismic Behavior And Nonlinear Finite Element Analysis On High Ductile Reinforced Concrete-steel Plate Composite Coupling Beam

Under earthquake loading,the most important parts of coupled shear walls structure,loading-bearing walls,will be protected if coupling beams from plastic hinge which dissipate earthquake energy.Compared with the large span beam or slender beam,the nominal shear stress of the small span to depth ratio coupling beam is high,the stiffness is large,and the shear deformation is dominant.Someone put forward the form of steel plate-reinforced composite coupling beams,but premature cracking and damage of concrete itself very serious phenomenon is inevitable.Based on above,this article research the earthquake resistant behavior of the type of coupling beam which plus High ductile fiber reinforced concrete(HDC)on the basis of steel plate-reinforced composite coupling beam,more able to give full play to the advantages of both and promote their work together.In this paper,the high ductile fiber reinforced concrete-steel plate composite coupling beams regard as the research object,we conduct the experimental study and nonlinear finite element,the research content mainly includes the following points:(1)The seismic performance analysis of HDC reinforced concrete-steel plate composite coupling beam.This article designed 2 piece of HDC reinforced concrete-steel plate composite coupling beam and 2 piece of steel plate-reinforced composite coupling beam,and carried on quasi-static under low reversed cyclic loading,get the destruction features,hysteretic characteristics of the specimens,deformation capacity,stiffness and resistance to damage and energy dissipation,and so on of HDC-steel plate composite coupling beam.(2)By using the finite element software Abaqus,based on the seismic performance of HDC reinforced concrete-steel plate composite beams,simulate the seismic behavior of the structure by the finite element model of composite coupling beams,the rationality of the model is proved;The influence of these parameters on the seismic performance of composite coupling beams is analyzed by changing the thickness and height of steel plate,the ratio of span to depth and stirrup ratio.(3)The shear capacity of steel plate-reinforced concrete composite coupling beams with small span-to-depth ratio is analyzed based on simplified softened strut-and-tie model,also plus multi-strip model,the influencing factors of tensile effect and softening effect of HDC and the role of the secondary diagonal bar derived from the distribution of steel were considered.The shear capacity calculation method of steel plate-reinforced concrete composite coupling beams is established finally,the reliability is verified by the test results.