日本地震工学会論文集｜Vol.12 (2012) No. 4｜2011年東北地方太平洋沖地震で観測された長周期地震動が長周期型構造物の震動制御に与える影響 [PDF]

frequency | Once | scope | Page | email | language | Japanese| | translation | We clarify the seismic response of coupled long-period structures with Maxwell-type dampers subjected tolong-period ground motions. The simulated long-period ground motions induced in anticipated Nankaiearthquake are used for analyses. By varying damping coefficient cm and stiffness km of dampers, the minimalrelative displacements for 2DOF systems are computed to analyze the dependence of long-period components ofthe ground motions on the effectiveness of optimal structural control by installing dampers from view of fivepoints : frequency ratio ?f/?1s defined as the value of dominant angular frequency of a ground motion ?fcompared with 1st natural angular frequency of the systems ?1s, mass ratio µ (m2/m1), frequency ratio ? (?2/?1)defined as the ratio of natural angular frequency for system 2 ?2 by that for system 1 ?1, stiffness ratio ofdampers n defined as the ratio of damper's stiffness km by system 1's stiffness k1 and damping ratio ? defined asthe ratio of damping coefficient cm by system 1's damping coefficient. Furthermore, we analyze long-periodcomponents of the ground motions recorded at 506 K-NET and KiK-net stations in the 2011 off the Pacific Coastof Tohoku earthquake, which are possible to affect seismic response of coupled long-period structures with - 431 -Maxwell-type dampers.