|
Title |
Load-Displacement Relationship of Passive Vibration Units Composed with a Spring and Vibration-Proof Rubbers
|
|
Authors |
문주현(Ju-Hyun Mun) ; 임채림(Chae-Rim Im) ; 왕혜린(Hye-Rin Wang) ; 양근혁(Keun-Hyeok Yang) |
|
DOI |
https://doi.org/10.11112/jksmi.2021.25.6.226 |
|
Abstract |
The objective of this study is to establish the fundamental design data for axial load-displacement relationship under axial monotonic or cyclic responses of seismic damping·isolation (SDI) units developed for ceiling structures. The main parameters include the installation of a spring, the number of rubber layer, prestress stress of bolts for connector between the spring and rubbers, and loading type. Test results showed that SDI units with a spring in the core and higher prestress stress of bolts tended to be higher stiffness at the ascending branch and more ductile behavior at the descending branch. This trends more notable for the specimens under monotonic load rather than cyclic loads. Consequently, the energy dissipation of SDI unit can be optimally designed with the following conditions: installation of a spring within 3-layer rubbers and prestress applied to the bolts at 10% of their yielding strength . When compared with the experimental tension capacity of the developed SDI units, the predictions by JIS B 2704-1 and KDS 31 00 are conservative under monotonic loading but higher by approximately 10% under cyclic loading.
|