Seismic damage monitoirng for steel structure using smart distributed fiber optics

Shuang Hou; C. S. Steve Cai; Jian He; Guoping Zhang; Jinping Ou

doi:10.1117/12.815616

30 March 2009 Seismic damage monitoirng for steel structure using smart distributed fiber optics

Shuang Hou, C. S. Steve Cai, Jian He, Guoping Zhang, Jinping Ou

Proceedings Volume 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009; 72923U (2009) https://doi.org/10.1117/12.815616
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

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.

Citation Download Citation

Shuang Hou, C. S. Steve Cai, Jian He, Guoping Zhang, and Jinping Ou "Seismic damage monitoirng for steel structure using smart distributed fiber optics", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72923U (30 March 2009); https://doi.org/10.1117/12.815616

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