Deformation monitoring and numerical simulation of prestressed concrete beam with local corrosion and fracture of prestressed steel

Figures & data

Figure 1. Test model of prestressed reinforcement corrosion (mm).

Figure 2. Structural reinforcement method (mm).

Figure 3. Prestressed reinforcement tensioning and anchoring equipment.

Figure 4. Corrosion test of prestressed concrete beam.

Table 1. Parameter settings of the PPP-BOTDA monitoring equipment.

Fibre length (m)	Sampling interval (cm)	Spatial resolution (cm)	Average times	Frequency range (GHz)	Pump (dB)	Probe (dB)	Ambient temperature (°C)
200	5	10	2^17	10.62–11.17	25	0	7.7

Figure 5. Layout of optical fibre.

Figure 6. Strain change of 15m–31m optical fibre.

Figure 7. Microstrain of central axis position changes with time.

Figure 8. Strain changes in Line 1 to Line 4 with corrosion time.

Figure 9. Spatial and temporal distribution of relative microstrain.

Figure 10. Location of ordinary reinforcement and prestressed reinforcement.

Figure 11. Mechanical property test curve of prestressed reinforcement and ordinary reinforcement.

Table 2. Mechanical property parameters of the reinforcement material.

Material	Yield strength (MPa)	Elastic modulus (MPa)
Prestressed reinforcement	1597.51	205,000
Ordinary reinforcement	545.91	200,000

Table 3. Mechanical property parameters of C50 concrete.

Material	$f_{\mathit{cu},\mathit{k}}$(MPa)	$f_{\mathit{ck}}$(MPa)	$f_{\mathit{t}\mathrm{k}}$(MPa)	$f_{\mathit{ce}}$(MPa)	$\mathit{E}$(MPa)
Concrete	67.97	48.93	3.4	29.358	36,893.3

Figure 12. The relationship between bond force and slip of non-linear spring.

Figure 13. Comparison of simulation results for the solid element and the truss element.

Figure 14. Strain change of prestressed steel before and after fracture.

Figure 15. Comparison of experimental and numerical simulation strain results (centre position of Line1).

Figure 16. Strain change of Line1 (numerical simulation).

Figure 17. Strain change of Line1 (monitoring test).