Steel Compression Members under Simulated Corrosion and Elevated Temperature Effect
Steel Compression Members under Simulated Corrosion
- Experimental studies on corroded coupons
- Experimental studies on behaviour of steel angle and tubular compression members under simulated corrosion
- Monitoring corrosion using Fiber Bragg Grating (FBG) sensors
Alternate wetting and drying
Electrochemical corrosion
Monitoring corrosion using FBG sensors
Unstressed condition
Stressed condition
Localised simulation of corrosion in compression members
Angle
Tube
Thickness measurement
Load vs Axial deflection
Buckling AUC-1
Buckling AC-2
Crippling
AC-3
Methodology to quantify corrosion
Microstructure analysis
Crack Formation
Reference Sample
Corroded Sample
Stress vs Strain
Strain vs Time from FBG sensor under unstressed condition
Test set up & Instrumentation
Failure profile
Load vs Axial deflection
Outcomes
- Microstructure analysis reveals that crack formation in intergranular regions of stressed and corroded samples could be possible reason for strength reduction
- Loss of thickness due to corrosion leads to reduction in resistance area, producing a decreasing effect in structural performance in terms of strength
- FBG sensors can be used to measure strain due to corrosion
Steel Compression Members under Elevated Temperature Effect
Simulation of elevated temperature effect
Bulging outward
Reference
Sample
Sample subjected
elevated temperature
Temperature distribution at salient points
Axial Load vs Axial Displacement
Microstructure analysis reveals that under elevated temperature, grain size increased from 15μm to 30μm
Strength reduction of 37%, under elevated temperature of 600oC sustained for a duration of 30 minutes