Aiming to address the problems of low lateral stiffness and difficult replacement in traditional flanged joints， a steel frame joint with a dumbbell-type replaceable energy-dissipating beam segment is proposed. By weakening the web of the dumbbell-type energy-dissipating beam segment instead of the flange， the joint achieves higher lateral stiffness and a reduced risk of out-of-plane instability. At the same time， the dumbbell-type replaceable energy-dissipating beam segment is connected with high-strength bolts to improve replaceability. This design allows for the replacement of only the beam segment instead of the entire beam， thereby saving steel. Using the finite element analysis method， a parametric study was conducted to compare and analyze the effects of different parameters， including web weakening depth， web weakening length， and asymmetric weakening， on the seismic performance of the joint. A comparative analysis was performed on key structural responses， such as stress-strain contour plots， hysteresis curves， skeleton curves， energy dissipation curves， energy dissipation coefficients， and stiffness degradation curves under different structural parameters. The results showed that the web weakening length had the least influence on the structural behavior， followed by the web weakening depth， with asymmetric weakening having the most significant impact. The recommended value for the web weakening length is 0.24 to 0.48 times the length of the dumbbell-type beam segment， while the recommended value for the web weakening depth is 0.07 to 0.21 times its height.A symmetric weakening configuration is advised.
WANG et al. (Wed,) studied this question.