Evaluation of Damping Properties of Reinforced Concrete Bridges and Viaducts Based on Vibration Measurement


Abstract eng:
Damping 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.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1351.:
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