Design and Physical Testing of Biaxial Minimal-Disturbance Arm Damper for Seismic Rehabilitation

Abstract eng:
The hollow structural section (HSS) columns are commonly used to sustain the seismic loading from any direction in Japanese steel frames due to its uniform geometry along each principle axis of cross section. However, during the earthquake, the bottom flanges of beam ends are usually the vulnerable parts. Thus, to retrofit the all beam ends of beamcolumn connection is more practical. This paper introduces a seismic rehabilitation technique, named MDAD (Minimaldisturbance Arm Damper), which is a tension-only bracing system to improve the seismic performance of steel moment resisting frame by restraining the local deformation at the bottom flange of beam ends and utilizing the reserve capacity of frame. It not only aims at minimizing the obstruction of the visual and physical space for building users but is expected to provide a stable hysteretic behavior to the steel frames under the seismic loading. In this study, the MDAD is developed to be biaxial configuration which can accommodate the bidirectional loading. With this new configuration, the design equations were developed. Furthermore, under bidirectional loading, the MDAD will experience the in-plane and out-ofplane deformation. To verify the performance of MDAD, the quasi-static testes under both unidirectional and bidirectional loading are constructed.

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