Application of FBG strain sensors in the measurement of three-directional strains within asphalt pavement
- Autores: D. Zejiao, T. Yiqiu, C. Fengchen, L. Hao
- Localización: Bearing capacity of roads, railways and airfields: proceedings of the 8th International Conference on the Bearing Capacity of Roads, Railways and Airfields, Champaign, Illinois, USA, June 29-July 2, 2009 / Erol Tutulumluer (dir.), Imad L. Al-Qadi (dir.), Vol. 1, 2009, ISBN 9780415804325, págs. 427-434
- Idioma: inglés
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Resumen
Fiber Bragg Grating (FBG) sensor is a relatively new tool to directly acquire dynamic strain responses of pavements subjected to traffic loading. Three-directional strain sensors jointed with a nylon junction are introduced here. At first, a four-point bending beam with FBG sensor embedded was designed to evaluate the coordinated working performance between sensor and pavement material in laboratory. Then, detailed instrumentation scheme on site is introduced followed with a preliminary analysis of different strain response histories.
The results show that three-directional strains measurement put forward here gives fine responses for different loading conditions at different depths within the pavement structure.
The pavement material is alternatively submitted to compressive and tensile strains, and observable residual vertical strain exists after single loading passes.
