Seismic Performance of Semi-rigid Connection Steel Frame with Central Brace
To study the seismic performance of a center brace steel frame connected by unilateral bolts and T-shaped steel,quasi-static loading tests were conducted on a 1∶2 scale single span single story steel frame.By using ABAQUS finite element software,a sub refined nonlinear finite element model was established to verify the reliability and accuracy of the sub finite element model.Based on this,the parametric analysis of the overall seismic performance of the frame was carried out by changing variables such as the aperture size,thickness,and shape of the brace.The results show that the finite element simulation results are in good agreement with the test results,and it can be used for the performance study of semi-rigid connected steel frame under cyclic loads.With the increase of brace aperture and thickness,the hysteresis curve of the frame becomes fuller,and the stiffness,energy dissipation capacity,and ductility are significantly improved.The seismic performance of square section brace is superior to that of circular section braces.The semi-rigid connection method of beam column nodes has better seismic performance than the rigid connection method.
T-stubcenter bracesteel framefinite element analysis
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