000018385 001__ 18385
000018385 005__ 20170118182220.0
000018385 04107 $$aeng
000018385 046__ $$k2017-01-09
000018385 100__ $$aSakai, Kimitoshi
000018385 24500 $$aEvaluation of Damping Properties of Reinforced Concrete Bridges and Viaducts  Based on Vibration Measurement

000018385 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018385 260__ $$b
000018385 506__ $$arestricted
000018385 520__ $$2eng$$aDamping properties are important in evaluating the safety of structures or the running safety of railway vehicles during earthquakes. For instance, it is pointed out that the differences of the damping constant of railway structures may have caused the different damage of structures in 2011 off the Pacific coast of Tohoku Earthquake. However, there is no adequate evaluation method of damping properties at present because there are only a few measurement examples for damping properties and the occurrence factors of damping are very complex. In this study, we measured the damping constants and the natural periods of railway structures of various structural types and in various ground conditions by using two vibration measurement methods. As a result, we can notice that some dispersion exists between the empiric formula and the measured data. Anyway the natural period and the damping constant are inversely proportional to each other. Furthermore we define the amplitude ratio of upper side to lower side of the structure, and analyse the relationship between the damping constant and the amplitude ratio. As a result, there is a positive correlation between the damping constant and the amplitude ratio, and it seems that the damping constant of the whole structure is decided by the weight of structural damping properties and ground’s ones.

000018385 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018385 653__ $$adamping properties, vibration measurement, railway structures, natural period

000018385 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018385 720__ $$aSakai, Kimitoshi$$iMurono, Yoshitaka$$iWada, Kazunori
000018385 8560_ $$ffischerc@itam.cas.cz
000018385 8564_ $$s867980$$uhttps://invenio.itam.cas.cz/record/18385/files/1351.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1351.
000018385 962__ $$r16048
000018385 980__ $$aPAPER