000011560 001__ 11560
000011560 005__ 20141205155923.0
000011560 04107 $$aeng
000011560 046__ $$k2008-10-12
000011560 100__ $$aSato, Tsutomu
000011560 24500 $$aThe Change of the Dynamic Characteristics Using Microtremor

000011560 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011560 260__ $$b
000011560 506__ $$arestricted
000011560 520__ $$2eng$$aConsidering the geotectonic environment and the historical importance, it is necessary to investigate the dynamic characteristics of the historical constructions in the city for rational and effective countermeasures against earthquake disasters. Since autumn 1998, microtremor measurements had been started to investigate the dynamic characteristics of several structures in Istanbul. In 17th August 1999 the Kocaeli Earthquake (Mw7.6, maximum PGA for rock site in Istanbul was 41 Gal) occurred and caused severe damage in the epicentral area. Microtremor measurements were conducted for few structures including historical monuments such as Suleymaniye mosque, Hagia Sophia museum, Sehzade mosque, and a newly constructed 14 stories office building, before the earthquake. In order to assess the earthquake’s aftermath on the measured structures in Istanbul, microtremor measurement was again conducted. The result of the measurement before and after the earthquake shows the change of natural frequencies decreasing after the earthquake up to about 8.9% for Hagia Sophia Museum. The avKb value, averaged Kb value was proposed by Nakamura et al. (2000) as vulnerability index for buildings. Because the averaged drift angle of the buildings can be estimated by multiplying the avKb value and the maximum input earthquake acceleration, the avKb value was proposed to assess the possibility of building damage. The avKb values before the Kocaeli earthquake are corresponds to the change of natural frequencies. Thus, it is expected that the danger of a structure can be assessed by the avKb in advance.

000011560 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011560 653__ $$amicrotremor, dynamic characteristic, vulnerability index, historical structure, damage

000011560 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011560 720__ $$aSato, Tsutomu$$iNakamura, Yutaka$$iSaita, Jun
000011560 8560_ $$ffischerc@itam.cas.cz
000011560 8564_ $$s2102745$$uhttps://invenio.itam.cas.cz/record/11560/files/07-0031.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 07-0031.
000011560 962__ $$r9324
000011560 980__ $$aPAPER