The bottom column base in a conventional steel frame is prone to plastic damage under the action of an earthquake. To achieve the seismic resilience of steel frames,a novel type of column base joint with replaceable shear corrugated plates (CBCP joint)was proposed. By using the verified finite element modeling and analysis,a finite element model of the novel joint was established,and its hysteretic behavior, stress development and plastic damage distribution were studied under cyclic loading. The effects of parameters such as the corrugated plate’s width-to-height ratio bc/hc,height-to-thickness ratio hc/tc and corrugation ratio Ca/Cl as well as the axial compression ratio n of the steel column on the hysteretic behavior of CBCP joint were investigated. The values of key parameters were suggested,and a formula for the joint’s load-carrying capacity was also put forward. It is found that the hysteretic curve of the column base joint is full,showing a satisfying energy dissipation capacity. During the cyclic loading process,plastic deformation occurs mainly on the corrugated plates while other components remain elastic, indicating that the column base joint can be quickly repaired by replacing the damaged corrugated plates after earthquake. The parametric analysis shows that the width-to-height ratio bc/hc and height-to-thickness ratio hc/tc have significant effects on the load-carrying capacity and hysteretic behavior of the column base joint. It is suggested that the corrugated plates with 0.5≤bc/hc<1.0 and hc/tc≤90 should be used in the preliminary design. Meanwhile,the ultimate load-carrying capacity provided by steel plates should not exceed the sectional edge-yielding load of the steel column,so that the steel column will not yield. Increasing the axial compression ratio n of the steel column can aggravate the P-Δ effect and significantly reduce the load-carrying capacity,resulting in the recommended value n≤0.4. Comparatively,the corrugation ratio Ca/Cl has an insignificant effect on the hysteretic behavior of the column base joint,which is suggested to take 0.1≤Ca/Cl≤0.2 in the common range. In general,the CBCP joint has characteristics such as a high load-carrying capacity,a satisfying energy dissipation capacity and damage control capability,with which the goal of reduced structural damage and resilience after earthquake can be achieved through a reasonable design. © 2024 Tianjin University. All rights reserved.
