Numerical analysis of seismic performance of unidirectional bolt end-plate joints
To deeply explore the influencing factors of the seismic performance of the connection node between square steel tube columns and H-shaped beams with unidirectional bolt end-plate joints,9 sets of finite element models were established using Abaqus finite element analysis software.The optimization analysis focused on column wall thickness,end plate thickness,bolt diameter,axial compression ratio of the column,beam height,flange thickness of the beam,web thickness of the beam,stiffener arrangement,and stiffener thickness.The study examined the hysteresis loop,skeleton curve,stiffness degradation,and energy dissipation capacity of the finite element models as seismic performance indicators.The results show that when the column wall thickness increased from 8 mm to 14 mm,the ultimate load-bearing capacity and initial rotational stiffness of the node improved by 91.6%and 93.7%,respectively,and the area of hysteretic energy dissipation under the same loading displacement significantly increased,with the equivalent viscous damping coefficient increasing by 50.0%.When the beam height increased from 200 mm to 350 mm,the ultimate load-bearing capacity and ini-tial rotational stiffness of the node improved by 78.9%and 157.1%,respectively,with a significant increase in the area of hysteretic energy dissipation under the same loading displacement and the equivalent viscous damping coefficient increasing by 9.3%.Changes in other parameters also had varying degrees of influence on the node′s ultimate load capacity,initial rotational stiffness,equivalent viscous damping coefficient,and hyster-etic energy dissipation.
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