抄録
The global damage of pile foundations is detected using multi-step system identification technique. Penzien-type lumped mass model is used as the mathematical model of superstructure-pile-soil coupled system to separate piles from the surrounding soil. Unbounded and bounded field models are constructed for detecting pile damage. A limited numbers of acceleration sensors are placed on the roof and base of superstructure, ground surface and supporting soil layer. Experimental data of shaking table tests are used to verify the damage detection scheme. The change in pile stiffness due to damage is identified as damage measure for different combinations of damage states of pile foundation and inertia effects from the superstructure.
