Study On Seismic Behavior Of The Frame Composed Of Special-shaped Concrete-filled Square Steel Tube Column And Energy Dissipation Wall

The Frame Composed of Special-Shaped Concrete-Filled Square Steel Tube Column(SCFST column)has better structural system performance.The beams and columns are not exposed in the room.The structure meets the requirements for the development of fabricated steel structure buildings.But the lateral stiffness is limited.More support or cast-in-place concrete shear walls should be added to high-rise residential buildings in high intensity zones.Therefore,SCFST column frame-steel plate shear wall structure system and SCFST column frame-soft steel damper wall structure system are proposed and their seismic performance is studied in this paper.Pseudo static tests of a SCFST column frame steel plate shear wall structure(specimen 1)and a SCFST column frame mild steel damping wall structure(specimen 2)are carried out.Specimen 1 shows buckling of steel plate shear wall at first and then the yielding mechanism of the plastic hinge is produced by the steel beam.Specimen 2 shows that the soft steel damper yields first,then the steel beam produces plastic hinges,and the column bottom finally produces buckling yield mechanism.Based on the phenomenon of columns tension crack in both tests,it is suggested that the column should be strengthened,the length of weld should be reduced,the stiffened steel plate shear wall should be adopted and the installation accuracy of soft steel dampers should be ensured in practical engineering applications.The hysteresis curves of the specimens have a larger encircling area.specimen 1 hysteresis curve has a pinch phenomenon.Specimen 2 hysteresis curve shows a full fusiform shape.The peak loads of the two specimens are 1638 kN and 511 kN,the peak displacements are 40.7 mm and 100.6 mm respectively,and the displacement ductility coefficients are 2.93 and 3.33 respectively.The maximum equivalent viscous damping coefficients are 0.298 and 0.373,respectively.The load-bearing capacity and stiffness of specimen 1 are larger,the deformation capacity and energy dissipation capacity of specimen 2 are better.Compared with the test results of SCFST column frame-braced structure and SCFST column frame-buckling-resistant brace structure respectively,the seismic performance of the two specimen is better.Using ABAQUS software to simulate and analyze the two tests.The analysis results show that the initial stiffness and ultimate bearing capacity of SCFST column frame-energy dissipation wall structure basically decrease with the increase of axial compression ratio,and increase with the increase of the length of special-shaped column.The increase of the inner side limb the outer side of the outer surface has a greater degree of stiffness and bearing capacity.Increasing the inner side limb has a greater degree of stiffness and bearing capacity than increasing the outer side limb.For the test frame designed in this paper,4 mm steel plate shear wall and 200 kN soft steel damper are matched,which can make the structure give full play to its seismic performance.Using YJK and MIDAS software to analyze 20-story SCFST column frame-steel plate shear wall structure and SCFST column frame-soft steel damper wall structure.The results show that the two kinds of wall panels can provide larger lateral stiffness for the structure under frequent earthquakes to reduce its displacement response,so that the structure can meet the requirements of small earthquakes.Under rare earthquakes,the soft steel damper wall can increase the additional damping ratio of the structure by yielding energy dissipation,effectively protect the main structure,and control the displacement response of the structure to meet the requirements of large earthquakes.