Evaluation of post-tensioning of a curved continuous girder using long-gauge fiber optic sensors

Hiba Abdel-Jaber; Branko Glisic

doi:10.1117/12.2045431

9 March 2014 Evaluation of post-tensioning of a curved continuous girder using long-gauge fiber optic sensors

Hiba Abdel-Jaber, Branko Glisic

Author Affiliations +

Proceedings Volume 9064, Health Monitoring of Structural and Biological Systems 2014; 906408 (2014) https://doi.org/10.1117/12.2045431
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

Streicker Bridge is a pedestrian bridge on the Princeton University campus. It consists of a main span and four curved continuous girders (legs). The main span and the southeast leg of the bridge are equipped with fiber optic strain and temperature sensors, allowing the bridge to also function as an on-campus laboratory for the Structural Health Monitoring research group. Parallel sensors were embedded at critical cross-sections in the deck prior to the pouring of concrete. The deck of the southeast leg experienced early age cracking within a few days of concrete pouring, which was detected by the strain sensors. Post-tensioning was then performed and it is assumed that it closed off the cracks. Evaluation of post-tensioning forces is complex due to the existence of the cracks, and this paper researches a procedure to estimate the post-tensioning forces at cracked and uncracked locations. The obtained post-tensioning forces were compared to design forces and conclusions regarding the status of post-tensioning were made. This is important as it gives information on the actual health condition and performance of the structure. It also provides information on the safety of the structure. The objective of this paper is to present a methodology for the evaluation of the post-tensioning force along the deck based on strain measurements. The monitoring system, results, data analysis method, and conclusions regarding the bridge health condition and performance are presented in this paper.

Citation Download Citation

Hiba Abdel-Jaber and Branko Glisic "Evaluation of post-tensioning of a curved continuous girder using long-gauge fiber optic sensors", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 906408 (9 March 2014); https://doi.org/10.1117/12.2045431

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