Research Article
Improvement of Stop-Hole Method on Fatigue-Cracked Steel Plates by Using High-Strength Bolts and CFRP Strips
Table 4
Fatigue test results of specimens.
| | Strengthening method | Test specimen | Load amplitude (kN) | Measured stress amplitude (MPa) | Crack initiation life (104 times) | Total fatigue life (104 times) | Fatigue life extension ratio |
| | Unrepaired | 1-1 | 150 | 157 | 1.0 | 8.2 | 1 | | 1-2 | 175 | 180 | 0.5 | 4.6 | 1 | | 1-3 | 200 | 204 | 0.4 | 3.7 | 1 |
| | Only stop-hole | 2-1 | 150 | 210 | 20.5 | 25.2 | 20.5 | | 2-2 | 175 | 230 | 13.5 | 17.1 | 27 | | 2-3 | 200 | 288 | 5.0 | 8.1 | 12.5 |
| | High-strength bolt stop-hole | 3-1 | 150 | 185 | 178.5 | 180.7 | 178.5 | | 3-2 | 175 | 201 | 139.5 | 141.9 | 279 | | 3-3 | 200 | 231 | 23.5 | 26.6 | 58.75 |
| | High-modulus CFRP | 4-1 | 150 | 197 | 172.7 | 175.7 | 172.7 | | 4-2 | 175 | 228 | 20.0 | 24.7 | 40 | | 4-3 | 200 | 250 | 13.0 | 18.2 | 32.5 |
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Washer slippage occurred in the 3-3 specimen, and CFRP debonding failures occurred in the 4-2 and 4-3 specimens. |
