000011195 001__ 11195
000011195 005__ 20141205155845.0
000011195 04107 $$aeng
000011195 046__ $$k2008-10-12
000011195 100__ $$aOgawa, Yoshimi
000011195 24500 $$aKiller Pulses of Hazardous Earthquake Motions and Transition of Natural Periods of Buildings

000011195 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011195 260__ $$b
000011195 506__ $$arestricted
000011195 520__ $$2eng$$aA theoretical approach of elasto-plastic response with a constant damping factor is proposed because almost all the damping mechanisms of buildings are not viscous but frictional. The skeleton curve of proposed single degree of freedom system is derived from the condition that the dissipative energy during one cycle of the elasto-plastic system is exactly same as that of the visco-elastic system. When the natural period of the elasto-plastic system is selected as the equivalent period at the maximum response, the shapes and amplitudes of the acceleration, velocity, displacement and total dissipative energy response spectra are approximately same as that of visco-elastic response spectra. Although the proposed elasto-plastic response system is non-liner, the spectrum with equivalent period shows linear response with fluctuations in amplitudes of input motions. The transition of equivalent period of the elasto-plastic system indicates significant relation between response amplitudes and damping factors of the system. The transition rate of equivalent period is proportional to the rate of response amplitude and the power of damping factor. This mechanism gives appropriate interpretation on the observed transition of natural periods of buildings. The proposed theory suggests that the natural period of wooden buildings increases about four to five times during severely damaged earthquake motions. This result gives good elucidation that the predominant periods of one second to two second during the 1995 Hyogoken Nanbu earthquake, known as the killer pulses, damaged rather shorter period buildings.

000011195 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011195 653__ $$aNatural Period of Buildings, Response Spectrum, Elasto-Plastic Response

000011195 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011195 720__ $$aOgawa, Yoshimi
000011195 8560_ $$ffischerc@itam.cas.cz
000011195 8564_ $$s470591$$uhttps://invenio.itam.cas.cz/record/11195/files/05-02-0026.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 05-02-0026.
000011195 962__ $$r9324
000011195 980__ $$aPAPER