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http://dx.doi.org/10.11112/jksmi.2012.16.6.134

Long-term Tilt Prediction Model for the L-type Retaining Wall Adjacent to Urban Apartments  

Koo, Ki Young (경일대학교 건설공학부)
Seong, Joo Hyun (한국시설안전공단 시설안전연구소)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.16, no.6, 2012 , pp. 134-142 More about this Journal
Abstract
This paper presents a study of system identification on the tilt response of the L-type retaining wall located at Tanhyun 11th ACE Apartment, Ilsan in order to understand mechanism how the structure behaves in operational conditions and to provide a reference tilt values for assessing structural abnormality. The retaining wall was extraordinarily tall (14m) in urban area so the long-term monitoring system had been installed with 3 tilts-meters and 9 temperature sensors operational from Oct 2004 upto Nov 2007. By using 5-months continuous data in which all the 12 channels were up and running, the two prediction models, 1) the linear model, and 2) the state-space equation (SSE) model, have been identified by finding the best fitness model among all possible 511 combinations of input temperatures out of the 9 temperatures. The linear model which was simple in the model structure achieved the validation fittness of 68% due to the fact that the static model wasn't able to represent thermal dynamics. The SSE model achieved the validation fitness of 90% which was quite accurate considering various unexpected noises happening in field measurements.
Keywords
Structural health monitoring; L-type retaining wall; Tilt measurements; State space equation model; Thermal responses;
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