Research on Mechanical Properties of Square Steel Tubular Column-H-Shaped Steel Beam Connected with External Diaphragm

The mechanical properties of beam-to-column joints of steel frames are an important factor in determining whether steel frames can perform normally under seismic action, but the current research mainly focuses on the mechanical properties of semi-rigid connection such as cruciform or end-plate types, and the research on the performance and seismic performance of semi-rigid connection in steel frames is not sufficient. In view of this, finite element simulations of single-storey single-span experimental steel frames are carried out using finite element analysis software ABAQUS and verified by tests, and multi-parameter analysis is carried out on the width-to-thickness ratio of the column and the height-to-width ratio of the panel zones, to obtain the effects of different parameters on the mechanical properties of the steel frames with semi-rigid connection, and to provide support for the promotion of the use of semi-rigid connection in steel frame design. The research results indicated that: the initial stiffness, yield load and ultimate load of the steel frame increase with the increase of column width-to-thickness ratio; the structural load and initial stiffness increase with the increase of the height of the beam web, and the stress concentration phenomenon at the connection and beam flanges can be improved by reducing the height of the beam web, but the change of the aspect ratio of the panel zones has a small effect on the structural ductility.