Number of story | Fixed base | Rubber and sliding isolators (LRB, FSB) | Rubber, sliding with rotation friction dampers at the base of the building (FD, FSB, LRB) | Rubber, sliding with rotation friction dampers at the ground floor level (FD1, FSB, LRB) | The amount of reduction of base shear as a result of isolation structure % | The amount of reduction drift as a result of isolation structure % | ||||
Time period (sec.) | Base shear (ton) | Time period (sec.) | Base shear (ton) | Time period (sec.) | Base shear (ton) | Time period (sec.) | Base shear (ton) | |||
8 | 0.7 | 655 | 1.9 | 350 | 0.9 | 324 | 1.89 | 351 | 47% | 65% |
12 | 1.1 | 883 | 2.37 | 341 | 1.41 | 311 | 2.36 | 345 | 61% | 74% |
16 | 1.5 | 497 | 2.94 | 466 | 1.83 | 325 | 2.93 | 458 | 6% | 28% |
20 | 2 | 564 | 3.31 | 582 | 2.3 | 390 | 3.31 | 581 | −3% | 13% |