SMART Rebar for Damage Detection

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SMART Rebar for Damage Detection of Reinforced
Concrete Structures
Hian-Leng Chan Advisor Fu-Kuo
Chang Sponsors NSF, BRI( Japan), SSRC(Japan)
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MOTIVATION

• Steel RC widely used
• Prone to damage
• Bond deterioration and yielding

• Current inspection techniques are
• Slow
• Labor-intensive
• Unsafe
• Limited to accessible areas

Impact Echo
Visual
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Built-in Active System
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SMART Rebar
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Pullout Test
Strain Gage Data
PZT Sensor Output
Normalized Sensor Output
Time (microsec)
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2
3
4
split failure
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Pullout Test
Strain gage data
PZT Sensor Output
5f
D19 (f19mm)
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2
3
4
15f
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Yield Monitoring
Strain gages
4 bar
Arrival time (msec)
Strain from PZT
Load (kN)
Strain gage