Deformational Behavior of High Performance Concrete Continuous Composite Beams Reinforced with Prestressed Prisms and Instrumented with Bragg Grating Fiber Optic Sensors

摘要

This investigation involves the identification and use of a novel type of fiber optic sensor in monitoring the deformation behavior of critical sections of the structural concrete elements and transforming them into smart systems. Basic operating principles of the Bragg-grating sensors identified in this work are proved to be feasible. Deformational behavior of high-performance concrete continuous composite beams reinforced with prestressed prisms and instrumented with Bragg grating fiber optic sensors was studied. The experimental techniques using those sensors for evaluating their behavior at service load stages and the potential of this technique for online, real-time monitoring of existing constructed concrete structures are presented. Four continuous beams were tested to failure. These beams were 5791 mm (19 ft) long and had two equal 2743 mm (9 ft) clear spans. High performance concrete with compressive strength f'_c in excess of'90MPa (13,000 psi) was used for both the precast prestressed prisms and the situ-cast main beams. Experimental results were compared with the theoretical evaluations obtained from nonlinear analysis. Parametric study was conducted to further identify the primary variables which affected the structural performance of such composite T-sections.