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Investigation on Double Tube Hybrid System (DTHS) through an analytical study is conducted as a part of the proposal on the seismic design method for Double Tubes Hybrid System (DTHS) for buildings. T...his structural system comprises Energy Dissipation Structural Walls (EDSWs) as the interior tube and Spandrel Wall Frame (SWF) as the exterior tube. The hysteretic behavior of EDSWs and SWF have been experimentally investigated and reported elsewhere. They indicated a stable elasto-plastic manner under cyclic lateral loading, and had an ample energy dissipation capacity. In order to establish a reliable performance-based seismic design method for DTHS, a further investigation of overall building through an analytical study is needed. Three building models, 3-story, 6-story, and 12-story are simulated by a frame analysis method. The structural behaviors of DTHS are investigated by performing static and dynamic response analyses. It is proved that high-rise building model utilizing proposed structural system is an effective structural system for DTHS, in which overturning moment dominates rather than shear, which is desirable in the view point of structural design. Application in low-rise building is proved also as an effective method to increase the structural performance of DTHS even though the design strength is set slightly larger than the value for controlling the deformation in high-rise building.show more
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