000009769 001__ 9769
000009769 005__ 20141205153152.0
000009769 04107 $$aeng
000009769 046__ $$k2008-10-12
000009769 100__ $$aConsuegra, Fabian A.
000009769 24500 $$aVariation of Dynamic Properties with Displacement in a 3-Story Reinforced Concrete Flat Plate Structure

000009769 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000009769 260__ $$b
000009769 506__ $$arestricted
000009769 520__ $$2eng$$aA full-scale three-story reinforced concrete flat-plate building was subjected to a series of quasi-static load cycles. At various stages of the quasi-static test dynamic tests in the forms of free and forced vibrations, ambient vibrations and modal impact-hammer tests, were performed to collect low-amplitude dynamic response data from the building. This paper presents results from the structure after three different drift levels during the quasi-static test. These drift levels are: as-built/zero drift, 1.5% overall drift and 3.0% overall drift (damaged condition). Data on natural frequencies and damping ratios are provided and discussed. It is shown that at low displacement levels the structure exhibits non-linear elastic behavior regardless of its past displacement level. Consequently, natural frequency is a displacement-amplitude-dependent parameter in the range of low displacement amplitudes. It is recommended that comparison of natural frequency before and after an event be made using results from tests with same displacement amplitude. The equivalent viscous damping ratio was observed to remain nearly constant in the range of low displacements while being sensitive to past maximum displacement level. However, once the structure reached damaged condition, damping ratio became sensitive to the displacement level of the dynamic tests as well. More data are needed to conclude whether a robust health monitoring technique based on damping measured at small amplitudes could be suggested for reinforced concrete structures.

000009769 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000009769 653__ $$aDynamic properties, damping, small amplitudes, health monitoring 

000009769 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000009769 720__ $$aConsuegra, Fabian A.$$iIrfanoglu, Ayhan
000009769 8560_ $$ffischerc@itam.cas.cz
000009769 8564_ $$s1856868$$uhttps://invenio.itam.cas.cz/record/9769/files/12-01-0156.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 12-01-0156.
000009769 962__ $$r9324
000009769 980__ $$aPAPER