Application of Local-Deformation Based Design Method To Various Steel Frames

Abstract eng:
Minimal-Disturbance Arm Damper (MDAD) has been proposed within the seismic retrofitting scheme of minimaldisturbance to building users. The MDAD is a light-weight and handy rehabilitation technique and improves the stiffness and strength of the entire frame moderately. The MDAD’s notable contribution is its feature in re-distributing the force and deformation demand within the frame from the most vulnerable parts to the other components with reserved capacities. To effectively utilize this structural feature, a local-deformation based design method for the MDAD has been developed for the seismic rehabilitation of existing steel moment resisting frames (SMRFs). Its novel feature is that, it limits the local deformation at critical parts directly. This is a notable update. Many other design methods consider the stiffness and strength of overall frames as the design targets and sometimes increase the force demands to other existing components drastically. As of now, the efficacy of the developed design method was verified only for a benchmark SMRF with a beam collapse mechanism. This paper aims to expand the application of the design method to other frame configurations as a step toward its practical use.

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