Seismic Analysis Of Steel Reinforced Concrete Hybrid Frame Structure

The Steel reinforced concrete structure has the characteristic of high profound intensity and rigidity, good plasticity and toughness, good excellent seismic performance. Hybrid frame of steel reinforced concrete (SRC) column-steel beam as a new type of structural system, are more and more widely used in a multi-high-rise buildings.This paper adopts large general finite element analysis software SAP2000 to build a 12 story hybrid frame of steel reinforced concrete column-steel beam,consider the three factors such as steel ratio of SRC column,linear stiffness ratio of beam to column and form of steel of SRC column on the seismic performance of the structure. First,perform model analysis to discuss the vibration characteristis of the structure from the three factors for further seismic analysis. Secend,perform mode superposition response spectrum analysis and time-history analysis,in the elastic stage,to discuss the deformation capacity and lateral stiffness of the structural from the three factors.Finally,perform nonlinear static analysis,in the elastic-plastic stage,to discuss the lateral stiffness,deformation capacity,ductility and energy dissipation capacity of the structrue from the three factors.The results show that:steel ratio of SRC column has the little effection on the hybrid frame of SRC column-steel beam in the elastic stage,but into the elastic-plastic stage, as the steel ratio increases, the structure's lateral stiffness, deformation capacity, ductility and energy dissipation capacity are significantly improved; with the linear stiffness ratio of beam to column increases, either elastic or elastoplastic stage, the structure's lateral stiffness improved significantly, but the structure's deformation capacity, ductility and energy dissipation decrease significantly; form of steel of SRC column has the little effection on the hybrid frame of SRC column-steel beam in the elastic stage,but has the more significantly impact in the elastic-plastic stage. Deformation capacity and ductility in turn is better as follows:H steel, cross-section steel,square tube steel, round tube steel.Lateral stiffness in turn is better as follows:H steel, square tube steel, round tube steel, cross-section steel.This article's seismic analysis result provides a reference for the seismic design of the SRC column-steel beam hybrid frame structure.