Seismic Behavior Analysis And Design Improvement Of RC Space Frame Considering Variation Of Material Constitutive Parameters

The reinforced concrete structure has the characteristics of good durability,economic applicability and high strength,therefore,Therefore,it has been widely used in the field of construction.But in the actual engineering,the concrete and rebar inherent characteristics and construction reasons,cause the material constitutive parameters are random and variability,which caused the diversity and uncertainty of structural mechanics response.The stress-strain relation of materials is the basis of nonlinear analysis,and the stress-strain relation of materials will directly affect the nonlinear analysis of structures.Based on this,this paper takes RC space frame as the research object,analysis of material stress-strain curve parameters variation on the properties of RC space frame,and the improvement of the common RC space frame according to the bearing capacity and stiffness equivalent principle,the improved RC space frame by the material stress-strain variation is relatively common RC small space frame.By using the Pushover analysis method,RC spatial analysis framework parameters of stress and strain parameters and the base shear,maximum displacement,ductility coefficient and energy dissipation structure in seismic structural material,as the RC space frame earthquake resistance evaluation before and after the improvement of the quality of.The parameter variation range of stress-strain curves is obtained by relevant literatures.The constitutive parameters of materials are obtained by uniform test.Finally,from the analysis of 37 sample points in pushover,with ordinary concrete as the standard to select the energy consumption analysis of the largest,intermediate and minimumsample points to the improved RC space frame hysteresis analysis before and after the improvement of the framework of RC test material are compared considering the seismic performance of the structure when the cumulative damage.After the relevant examples show that(1)Selecting different uniform design tables will affect the size of the material parameters of each sample point,but it will not affect the average value of seismic performance index and the coefficient of variation,which will lay the foundation for follow-up research.(2)The performance of ordinary RC space frame by the constitutive stress-strain curve parameters variation influence,unfavorable to the aseismic structure,the concrete filled steel tube in order to improve the RC space framework,RC space framework of the improvement can reduce the good material constitutive parameters of seismic performance of structure variation.