| Title |
Design Shear Force Reduction Factor of Upper Structure in Seismic Base-isolated System Considering Response Acceleration Decrement Effect |
| Authors |
Chen, Hao ; Oh, Sang-Hoon |
| DOI |
https://doi.org/10.5659/JAIK_SC.2019.35.7.165 |
| Keywords |
Seismic Base-isolated System; Response Acceleration; Design Shear Force; Reduction Factor |
| Abstract |
The structural damage caused by earthquake to the upper structure of seismic base-isolated system can be suppressed effectively because it
is designed to concentrate the input energy on the seismic isolation floor. Further, the response acceleration of seismic base-isolated system
can be greatly reduced compared to the seismic structure because of the long period, which means that the design shear force of the
seismic base-isolated system can be reduced appropriately. However, when the design shear force is determined to be reduced, the design
stiffness will decrease, and the response acceleration will increase oppositely. Therefore, for finding the extent to which the design shear
force of the upper structure can be reduced, this paper considered the seismic base-isolated structure as the analytical model and proposed
the design shear force reduction factor of the base-isolated structure through the dynamic response analysis, while considering the decrement
effect of response acceleration. The research result shows that the response acceleration of the isolated the upper structure can be reduced by
50%~70% of the seismic structure under the same design conditions, and the design shear force can be reduced by up to 40%. By
increasing the design stiffness over to 1.8 times of the original design value, the design shear force can be reduced to the same extent as
the response acceleration can be reduced compared to the seismic structure. |