Abstract:
To exert plastic bearing capacity of columns, an earthquake-resilient column base with multistage resistance was proposed. By setting limit members that do not participate in the force in the early stage and can provide certain resistance in the later stage, the function of the column base can be restored within allowable deformation range, and the bearing capacity of structures can be fully employed under large deformation state. The relationship of the bearing capacity and displacement for the column base was given out through a theoretical analysis. Based on the verified finite element analysis method, the static pushover analyses and hysteretic analyses were conducted. The results show that the design concept of multistage resistance was feasible. The column base proposed can realize multistage resistance. The requirements of function recovery and bearing capacity were simultaneously considered. The theoretical analysis was accurate and reliable, which can be used to estimate the load-displacement curves of the column bases. The energy dissipation mode of traditional earthquake-resilient column bases was optimized by a novel design concept.