Research on seismic performance of weld box-shaped columns fabricated of Q345FR and Q460FR steel
This paper conducted an experimental study on seismic performance of weld box-shaped columns made of Q345FR and Q460FR fire-resistant steels to enhance the application of fire-resistant steel structure in seismic regions.Through a validated numerical model,a parametric study was subsequently performed to clarify the influence of axial load ratio,slenderness and plate width-to-thickness ratio on the seismic behavior.The fire-resistant steels demonstrate an obvious cyclic-softening behavior.Columns with cross-section of'Level 1'in GB 50011-2010 exhibit a failure mode of elastic-plastic local buckling in plate components.The hysteretic curves and drift angle are favorable for utilization in steel frames.The columns studied herein exhibit similar seismic performance with that of existing Q460C weld columns.The increase in plate slenderness and axial load ratio tends to decrease the flexural capacity and energy-dissipation ability.Based on the test and numerical results,a normalized hysteretic model for the columns was established studied.The proposed model can provide a reasonable prediction accuracy due to the consideration of cumulative damage,axial load ratio and plate slenderness.
fire-resistant steel structureQ345FR steelQ460FR steelbox-shaped columnFEAseismic performancehysteretic model
万方数据
维普
