Shaking Table Test Study On Solid-Web Steel Reinforced Concrete Frame With Special-Shaped Columns

Steel reinforced concrete(SRC)structure with special-shaped columns has both the advantages of the SRC structure and the special-shaped columns structure,but also overcomes the shortcomings of the ordinary concrete structure with special-shaped columns,such as low bearing capacity,low axial compression ratio and weak seismic performance,so it has great significance to expand the scope of application of the special-shaped columns structure.Currently,the research on the members of SRC structure with special-shaped columns,such as columns and nodes,has achieved considerable outcomes,and research on the seismic performance of the SRC frame with special-shaped columns is still very few.Before our group have completed 3 models of SRC frame with special-shaped columns under low cyclic reversed loading test,systematically studied the seismic performance and design method of SRC structure with special-shaped columns.Based on the previous studies,the seismic performance of the SRC frame with special-shaped columns by shaking table test is deeply studied in this dissertation.According to the experimental study on a 1/4 ration of five-story and two-bay frame consisting of reinforced concrete beams and SRC special-shaped columns under shaking table test,the failure process under different seismic intensity was observed,the dynamic characteristics of the model and the acceleration response,the displacement response,the floor shear forces,the strain response of steel and rebar were studied.The results show that the natural frequency descends and the acceleration amplification factor decreases gradually with the increase of seismic intensity,shear-bearing type is the main reaction type;the cracks mainly concentrated in the bottom three layers,the deterioration of inter-storey stiffness is quite rapid;in the later stages of elastoplastic,the beam end firstly appeared plastic hinge,and special-shaped columns also has a certain of bearing capacity,the lateral force resisting rigidity significantly degenerated;the elastic story drift angle exceeds the given limit value by the code,but the structure is still in the elastic stage;the elastoplastic story drift angle meets the regulatory requirements,which proved that the structure has great earthquake resistant and deformation properties;the side frame endured larger forces,and the L-shaped column and the beam end were the weak region of the structure,the ratio of column limb height to thickness should be reduced,and the anchorage of the beam end and corner column should be enhanced in the design.The finite element model of the frame was established for dynamic analysis by the use of Open Sees program,and the comparison of the vibration period,acceleration response and displacement response was completed,the calculated results are in agreement with the experimental results,proving the accuracy and reliability of the program for finite analysis of the SRC structure with special-shaped columns.