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Title: Vibration-Based Nondestructive Damage Detection for Concrete Plates

Author(s): Azita Pourrastegar and H. Marzouk

Publication: Structural Journal

Volume: 118

Issue: 6

Appears on pages(s): 117-127

Keywords: crack pattern; damage detection in concrete plates; fiber Bragg grating (FBG); fiber-optic sensor (FOS) array; random decrement (RD) method; steel fiber content; steel reinforcement ratio; ultra-high-performance fiber-reinforced concrete (UHP-FRC) plates

Date: 11/1/2021

Abstract:
This research’s primary objectives were first to verify a reliable structural health monitoring (SHM) experimental technique for reinforced concrete slab plates, and secondly, to introduce a special fiber Bragg grating (FBG) sensors cable system for continuous field monitoring of concrete. The particular focus was on the damage assessment, using an effective ambient vibration-based damage diagnostic technique of random decrement (RD). An investigation examined the extent of damage induced by progressive static loading through a numerical RD algorithm for four concrete plate specimens: three reinforced high-strength concrete (HSC) plates with different reinforcement ratios, and one ultra-high-performance fiber-reinforced concrete (UHP-FRC) plate. The extent of damage was measured through relative changes in the natural frequency and damping ratio as dynamic parameter damage indexes, which were obtained from RD signatures at cracking, yield, and ultimate loadings. Concurrently, the behavior of the concrete slabs was examined regarding the load-deflection relationship at service and ultimate load, crack pattern, and failure modes.


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Electronic Structural Journal



  

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