Development of an earthquake-resilient column base equipped with a bidirectional hinge: Seismic performance and structural applications

Abstract

A novel earthquake-resilient column base equipped with a bidirectional hinge is proposed. The bottom contact surface of the column is optimized to reduce the stress concentration and horizontal displacement. Theoretical, experimental, and numerical investigations of the column base were conducted. First, a theoretical hysteretic model of the column base was deduced and verified through numerical investigations. The load–displacement relationships were accurately estimated. Five cyclic loading tests were conducted to investigate the seismic performance of the column base. It exhibited a preferable earthquake-resilient function and low-cycle fatigue performance. Subsequently, numerical investigations were conducted using the refined models. The true hysteretic curves and energy dissipation of the column base were analyzed. More than 90 % of the energy was dissipated by the dampers at a joint rotation of 5 % rad. Finally, time-history analyses of a six-story steel frame were performed using a simplified model. The mechanical performance of the damper is close to that in an ideal axial stress state. The column base possesses favorable energy dissipation in the overall structure. This study provides a reference for designing earthquake-resilient column bases.