Numerical Study On Seismic Performance Of The Steel Encased Concrete Composite Frame System

The new-type steel-encased concrete composite beams are developed on theexperience of traditional steel-concrete composite beams, pouring concrete into theU-section steel tank rolling from the combination of thin-walled cold-formed steel andthick steel plate or entirely the thin-walled cold-formed steel. And then make steel andconcrete materials work together by shear connectors. It has been demonstrated that thenew-type steel-encased concrete composite beams have the advantages of highmechanical performance, stability and integrity, can be industrial producted, improvedfireproof performance, and can improve comprehensive economic index etc.The seismic performance of frame structure based on the new-type steel-encasedconcrete composite beams is studied using the finite element analysis software ANSYSin this paper. The details are as follows.(1) The research status of the new-type steel-encased concrete composite beams andcomposite frame structure is introduced and the research trend of the new-typesteel-encased concrete composite beams is pointed out in this paper.(2) The finite element model of frame structure based on the new-type steel-encasedconcrete composite beams is established and the low-cycle repeated horizontal load isapplied to the finite element model. The hysteretic curve and other seismicperformance indicators are analyzed and compared with the test results. Conclusionsindicate that the frame structure finite element model is reasonable and effective inthis paper.(3) Six different kinds of frame structures composed by the new-type steel-encasedconcrete composite beams, traditional composite beams, reinforced concrete beams andSRC columns, RC columns are established in this paper. The hysteretic curve,skeleton curve, stiffness degradation curve and ductility factor of the frame structuresare analyzed comparatively in this paper.(4) Slip distribution between steel and concrete materials of the frame structures basedon the new-type steel-encased concrete composite beams is analyzed in this paper.(5) The finite element model of the composite floor composed of the traditional composite beams and concrete slab is established and calculated using FEM. Thecomparative analysis of mechanical behavior of the composite floor with the test resultsindicates that composite floor finite element model in this paper is effective. Thenanother finite element model of composite floor composed of new-type steel-encasedconcrete composite beams and concrete slab is established. The deflection, carryingcapacity and other mechanical behavior of the two kinds of composite floors areanalyzed comparatively.