Substructure Hybrid Simulation Test Study On Solid-Web Steel Reinforced Concrete Frame With Special-Shaped

Steel reinforced concrete structure with special-shaped columns has both the advantages of the special-shaped columns structure and the steel-reinforced concrete structure.It not only changes the defects of the structural column protruding indoors and occupying the building space,but also overcomes the low bearing capacity,low axial compression ratio and weak seismic performance.Currently,the research on the mechanical performance of steel reinforced concrete structure with special-shaped columns and its frame nodes has achieved considerable outcomes in domestic and foreign,but the seismic performance of the overall structure is still very new.Based on the previous studies,the substructure hybrid simulation test method is used to systematically study the seismic performance of the eight-story steel reinforced concrete space frame with special-shaped columns.In this paper,the basic principle of the substructure hybrid simulation test method and the components of the hybrid simulation experiment system are analyzed.The bottom three layers in the nonlinear state are used as the test substructure model of SRC frame with special-shaped columns to establish the test unit,and the OpenSees Navigator finite element is used to establish the numerical substructure model of the upper five-story SRC frame with special-shaped columns,and jointly studies the seismic performance of the substructure hybrid simulation of the 1/4 ration of eight-story solid-web SRC frame structure with special-shaped columns.During the the substructure hybrid simulation test the failure process of the model structure underdifferent seismic intensity were observed,and the effectiveness of the experimental preloaded neutron structure hybrid simulation test system was determined.The Acceleration response,displacement response,floor shear forces and strain response of components under different intensities were studied.The test results show that the cracks of the structure occurs in the bottom three layers,the damage degree continues to increase,and the deterioration of inter-storey stiffness is quite rapid;With the increase of seismic intensity,the acceleration amplification factor of the structure decreases and the relative displacement increases gradually,shear-bearing type is the main reaction type;the elastic and elastoplastic story drift angles of the structure are less than the standard limit,which meets the seismic fortification requirements of “small earthquake is not bad,large earthquake does not fall”,which proves that the structure has good seismic performance and deformation ability.In the stage of elastoplastic,plastic hinges appear at the frame beam end,which meets the design requirements of the “strong column weak beam”;the frame beam end is the weak area of the structure under the seismic action of each intensity.Established the pure numerical model of the eight-story solid-web SRC frame with special-shaped columns by using OpenSees Navigator finite element software.The dynamic analysis of the model structure under simulated earthquake was carried out,and the model acceleration response,the displacement response and the floor shear force comparison analysis were completed.The results show that the calculated values are in agreement with the experimental values,proving the finite element software can better simulate the dynamic response of the solid-web SRC frame structure with special-shaped columns in earthquake action.