Observed Damage - Foundation
Observed Damage - Foundation |
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| The foundations of the Ji Lu
remained structurally intact but showed signs of damage above the pile cap in the
plastic hinge zone.
The National Taiwanese University (NTU) performed in-situ sonic pile tests to investigate the structural integrity of the underlying pile foundation. Results showed no damage. Above the pile cap, soil was excavated down on the P11, P12, and P13 supports. For the central pylon, damage was seen extending 400 cm off the pile cap on the East and West sides of the structural element (Figure 1). There was, however, no notable damage on the North and South sides of the Pylon. This damage pattern suggests plastic hinging under transverse loading. |
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Figure 1 - Damage pattern on central pylon suggests plastic hinging due to loading in the transverse direction |
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| The P11 support showed signs of damage (Figure 2) on the West side of the West column and the East side of the East column. The damage is consistent with the onset of spalling due moment hinging coupled with high axial load. This mechanism is of coupled vertical and lateral load. |  |
Figure 2 - Foundation damage map for the West and East columns in the P11 support |
| The P13 support base was more
heavily damaged than the P11 counterpart though both showed the same mechanism.
The main span moved laterally more at this end and thus had more of a
lateral impact when it collided against the support.
Both P11 and P13 showed signs of Shear cracking in the Pier connecting beam. |
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Figure 3 - Foundation damage map for the West and East columns in the P13 support |
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