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论文类型：会议论文

发表时间：2009-03-09

收录刊物：EI、Scopus

卷号：7292

期号：PART 1

摘要：Determination of structural seismic damage mechanisms and post-seismic damage assessment remains a major challenge for civil engineers. One of the main reasons is that traditional sensors cannot serve for such a long term to capture a destructive earthquake and the seismic damage cannot definitely be predicted in advance. In this paper, a smart distributed fiber optic monitoring method based on OTDR technology is developed for steel structure seismic damage identification. Geopolymer is used as a "smart material" to couple the sensing optic fiber with the structure of interest. It not only functions as the adhesive for bonding the optic fiber to the structure and protecting it, but also works as the sensing material by forming cracks when the pre-defined damage state occurs, which introduce optic power loss into the optic fiber. The power loss is able to be monitored through optic time domain reflectrometry (OTDR). Tentative tests are conducted to decide the composition of geopolymer. It is found that the Si/Al ratio of 3.8 provided cracking strains of about 1300 micro strain, which is desirable for monitoring the yielding of steel. Monotonic, cyclic and buckling loading tests on steel specimen were conducted to verify the efficiency of the proposed system in monitoring seismic damage mechanism. ? 2009 SPIE.