Research Article
An Experimental Study of the Feasibility of Identifying the Impact Damages of Reinforced Concrete Piers Using a Modal Frequency Method
| Impact times | Drop height (m) | Car quality (kg) | Axial pressure (kN) | Drop hammer quality (kg) | Friction coefficient | Theoretical speed (m/s) | Measured average velocity (m/s) | Speed change rate (%) |
| 1 | 4 | 1200 | 250 | 166 | 0.12 | 1.124 | 1.114 | −0.890 | 2 | 6 | 1200 | 250 | 166 | 0.12 | 1.376 | 1.335 | −2.980 | 3 | 8 | 1200 | 250 | 166 | 0.12 | 1.589 | 1.563 | −1.636 | 4 | 10 | 1200 | 250 | 166 | 0.12 | 1.777 | 1.770 | −0.56 |
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