Research Article
Seismic Response of Torsionally Coupled System with Magnetorheological Dampers
Table 3
Response ratio,
for Peak and RMS Responses for various control strategies under Imperial Valley, 1940 earthquake (
,
,
).
| Response quantities | Control strategy | Passive-off | Passive-on | Semiactive clipped-optimal control |
| | for | 0.56903 | 0.52736 | 0.51507 | | (7.32%) | (9.48%) | | for | 0.65228 | 0.54286 | 0.54447 | | (16.77%) | (16.53%) | | for | 0.71709 | 0.61866 | 0.59502 | | (13.73%) | (17.02%) | | for | 0.56500 | 0.36206 | 0.36790 | | (35.92%) | (35.89%) | | for | 0.61011 | 0.61266 | 0.60387 | Based on peak response | (−0.42%) | (1.02%) | | for | 0.67720 | 0.61226 | 0.61318 | | (9.59%) | (9.45%) | | for | 0.76390 | 0.72524 | 0.71258 | | (5.06%) | (6.72%) | | for | 0.53690 | 0.36741 | 0.36840 | | (31.57%) | (31.38%) | | / | 0.01401 | 0.02000 | 0.02000 | | (−42.80%) | (−42.80%) | | / | 0.01407 | 0.02000 | 0.02000 | | (−42.11%) | (−42.11%) |
| | for | 0.61004 | 0.49222 | 0.52683 | | (19.31%) | (13.64%) | | for | 0.52862 | 0.36608 | 0.38857 | | (30.75%) | (26.49%) | | for | 0.50951 | 0.38461 | 0.41568 | | (24.51%) | (19.17%) | | for | 0.42665 | 0.24874 | 0.26326 | | (41.70%) | (38.30%) | | for | 0.68025 | 0.67366 | 0.63343 | Based on RMS response | (0.97%) | (6.88%) | | for | 0.55606 | 0.46018 | 0.44690 | | (17.24%) | (19.63%) | | for | 0.55171 | 0.53870 | 0.49283 | | (2.36%) | (10.67%) | | for | 0.44723 | 0.29753 | 0.29076 | | (33.47%) | (34.99%) | | / | 0.00718 | 0.01619 | 0.00969 | | (−125.49%) | (−34.88%) | | / | 0.00734 | 0.01627 | 0.00922 | | (−121.68%) | (−25.63%) |
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|
(Numbers in parentheses indicate percentage reduction as compared to the passive-off case. Positive numbers correspond to a response reduction.)
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