Strain Decay Monitoring and Analytical Prediction of RC Columns Using Brillouin Optical Technology and Time-Dependent Deterioration Factor
Ittipon Pasityothin, Phromphat Thansirichaisree, Apichat Buatik, Thanongsak Imjai, Radhika Sridhar, Reyes Garcia, Takafumi Noguchi
TL;DR
This study introduces a new method using BOTDA and a time-dependent factor to monitor and predict the long-term performance of reinforced concrete columns.
Contribution
The novel 'time-dependent deterioration factor' (ηdecay) improves the accuracy of predicting strain decay in RC columns over time.
Findings
BOTDA captured strain decay with over 95% resolution, detecting localized strain reductions missed by traditional methods.
Incorporating ηdecay into design codes improved experimental-to-predicted ratios to 1.42 (ACI 318) and 1.29 (Eurocode 2).
FEA validated the improved predictions up to yield load, with modified equations addressing underestimations from microcracking.
Abstract
This study presents a novel approach to the design and assessment of slender reinforced concrete (RC) columns by integrating Brillouin Optical Time Domain Analysis (BOTDA) for real-time, distributed strain monitoring and introducing a “time-dependent deterioration factor” strain decay (ηdecay). Experimental tests on 200 mm × 200 mm RC columns with lengths of 1800 mm and slenderness ratios of 29.4, reinforced with four 12 mm bars, captured strain variations up to 400 microstrain under an axial load of 1200 kN, demonstrate BOTDA’s sensitivity and precision. Unlike conventional strain gauges, BOTDA provided a continuous strain profile along the column height, accurately capturing strain decay with a resolution exceeding 95%, enabling the detection of localized strain reductions often missed by traditional methods. The integration of ηdecay into ACI 318 and Eurocode 2 models conservatively…
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Taxonomy
TopicsStructural Health Monitoring Techniques · Advanced Fiber Optic Sensors · Concrete Corrosion and Durability