000009648 001__ 9648
000009648 005__ 20141205150227.0
000009648 04107 $$aeng
000009648 046__ $$k2008-10-12
000009648 100__ $$aCelebi, Mehmet
000009648 24500 $$aReal-Time Monitoring of Drift for Occupancy Resumption

000009648 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000009648 260__ $$b
000009648 506__ $$arestricted
000009648 520__ $$2eng$$aAt selected locations of instrumented structures, real-time displacements are acquired by either double integration of accelerometer time-series data, or differential GPS with high sampling ratios deployed at roofs of tall buildings. Thus, sensor data is related to performance level and health of a building. Drift ratios are computed as the parametric indicator of damage condition of a structure. Several levels of threshold drift ratios can be postulated in order to make decisions for inspections and/or occupancy. Drift ratio is computed using relative displacement between two floors computed from accelerometers strategically deployed at select number of pairs of consecutive floors. However, GPS-measured relative displacements are limited to being acquired only at the roof with respect to its reference base yielding only average drift ratio for a building. Until recently, GPS systems available were limited to 10-20 samples per seconds (sps) capability – limiting their use only to long-period structures (T>1 s). Most recently, up to 50 sps differential GPS systems readily available are successfully used (Panagitou et al, 2006, Restrepo, pers. comm.. 2007) – thus enabling future usefulness of GPS to all types of structures. Experience with data acquired from both accelerometers and GPS deployments indicates that they are reliable and provide pragmatic alternatives to alert the owners and other authorized parties to make informed decisions and select choices for pre-defined actions following significant events. Furthermore, recent adoption of such methods by financial and industrial enterprises is testimony to their viability.

000009648 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000009648 653__ $$aDrift ratio, occupancy, damage indicator, accelerometer, displacement, GPS

000009648 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000009648 720__ $$aCelebi, Mehmet
000009648 8560_ $$ffischerc@itam.cas.cz
000009648 8564_ $$s783160$$uhttps://invenio.itam.cas.cz/record/9648/files/11-0003.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 11-0003.
000009648 962__ $$r9324
000009648 980__ $$aPAPER