000021794 001__ 21794
000021794 005__ 20170622131305.0
000021794 04107 $$aeng
000021794 046__ $$k2017-06-15
000021794 100__ $$aAzuhata, Tatsuya
000021794 24500 $$aA SIMPLIFIED PREDICTION METHOD FOR SEISMIC RESPONSES OF BUILDING FRAME STRUCTURES ALLOWED TO UPLIFT

000021794 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021794 260__ $$bNational Technical University of Athens, 2017
000021794 506__ $$arestricted
000021794 520__ $$2eng$$aPrevious studies cleared that rocking behaviors can reduce seismic damages of some buildings. Based on this knowledge, some rocking structural systems which are allowed to uplift during earthquakes intentionally have been proposed as one of seismic energy dissipation systems. In this study, we propose a simplified prediction method for earthquake responses of such rocking structural systems. To predict earthquake responses of the rocking systems, we need to evaluate effects of higher modes. We consider there are two sources to generate higher modes in the rocking systems. When a building starts uplift, higher modes simultaneously occur due to vertical inertial effects in the superstructure. Therefore, a dynamic overturning moment of the rocking systems surpasses that estimated statically. We evaluate this effect by using solutions of a free vibration of the target structure. Initial velocity for the free vibration can be specified if a velocity response spectrum is provided and the fundamental natural period, which is elongated after uplifting is appropriately estimated. Also, higher modes occur due to high-frequency components of an input earthquake ground motion. If the high-frequency components of the input motion are relatively large, performance for earthquake response reduction of the rocking structural system may deteriorate. These higher modes excited by the high-frequency components can be evaluated by using the response spectrum, too. We predict maximum earthquake responses of the rocking structural systems by combining the solution of free vibrations and higher mode responses of the corresponding fixed base model.

000021794 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021794 653__ $$aUplift, Rocking, Earthquake Response Reduction, Higher Modes, Response Spectrum.

000021794 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021794 720__ $$aAzuhata, Tatsuya$$iIshihara, Tadashi
000021794 8560_ $$ffischerc@itam.cas.cz
000021794 8564_ $$s2089608$$uhttps://invenio.itam.cas.cz/record/21794/files/17955.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS30] Dynamics and Seismic Response of Rocking and Self-centering Structures
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000021794 962__ $$r21500
000021794 980__ $$aPAPER