REINFORCEMENT METHOD OF EXISTING BASE-ISOLATED BUILDING

摘要

PROBLEM TO BE SOLVED: To provide a reinforcement method of an existing base-isolated building capable of securing both base isolation performance against a middle or small earthquake and an earthquake at an earthquake motion level of the original design and safety against a greater earthquake than was assumed in the original design.SOLUTION: In a base isolation layer 3, a displacement-changeover-type passive damper 10 that switches from a low attenuation mode to a high attenuation mode at a preset displacement is installed.SELECTED DRAWING: Figure 1