A COMBINED ENERGY DISSIPATION DEVICE AND ITS APPLICATION ON A WEAK-STORY

摘要

A weak-story in a multi-story building may cause excessive displacement during a severe ground motion. To prevent this effect, this study proposes an energy dissipation device combined of viscous dampers and displacement controlling limiter. The limiter which has a hardening type force-displacement relationship compensates the low capacity of the structure on the weak-story and provides a uniform ductility distribution among the stories. Considering the mentioned merit of limiter device, an energy-based damper design method was developed to obtain the necessary amount of damper. Technically speaking, damper design requires predicting the structural response accurately, which leads to iterative dynamic response analysis and sophisticated time history analysis. Proposed energy-based method does not require time history analysis as it assumes uniform ductility distribution, which can be obtained by the limiter.