Application and Design of Minimal-Disturbance Arm Damper for Steel Moment-Resisting Frames Part 2: Discussion for Design Procedures

摘要

This paper presents several preliminary design procedures ofMDADs and discusses their differences. For the different stagesin the pushover curve, several design procedures with differenttargets were explored. The plastic design procedure enables thedesign of the MDADs to result in a desired plastic hinge rotation.This was not possible for the elastic design where the reductionin plastic rotation was not proportional to the reduction inbending moment in the post-yielding range. Considering that themain objective of MDAD is to enhance the deformationcapacity of existing frames, and that the damage of frames werebest characterized by the amount of positive plastic rotation atbeam ends, the plastic design was more applicable for MDAD.Finally, the dynamic analysis was conducted to verify theeffectiveness of the plastic design. After rehabilitation, theamount of plastic hinge rotation was successfully limited withinthe target in the dynamic analysis.