Experimental Study on Seismic Performance of Prefabricated Cold-formed Thick-walled Steel Semi-rigid Beam-column Joints
The application of cold-formed steel in prefabricated structures has inherent advantages.In order to expand the range of use of cold-formed thick-walled steel structures and avoid its shortcomings,this paper designed six new layered assembled"cross-shaped"beam-column joints and conducted cyclic loading tests to investigate the failure mode,initial stiffness,skeleton curve,equivalent viscous damping coefficient,energy dissipation coefficient,secant stiffness,hysteresis curve and.strain distribution in key parts of the beam-column joints.The main conclusions were drawn as follows:Through the sliding of bolts and node plates,semi-rigid nodes have a certain energy dissipation capacity.Adding high-strength bolts can improve the bearing capacity initial stiffness and energy dissipation capacity of beam column joints as well as avoid bearing pressure on the bolt hole between the beam end and the connecting plate.Adding replaceable node flange plates has no significant impact on the failure mode of beam column joints,but significantly improves their bearing capacity,energy dissipation capacity,and initial stiffness.
cold formed thick-walled steelbeam-column nodessemi-rigidinitial stiffnessenergy consumption capacity
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