HORIZONTAL VIBRATION TESTING METHOD OF RAILWAY BRIDGE PILE FOUNDATION

Based on the explicit dynamic finite element model, dynamic responses of railway bridge pile foundation are simulated through pier-cap-pile-soil finite element model. The results show that: when the vibration force is applied at the bridge cap side surface, the bending waves of piles are produced, the horizontal velocity response at the pile head can display reflected stress wave from the pile bottom or fracture surface, and then we can determine whether the detected pile is complete or exist fracture damage. Compared with sonic echo method, this method avoids the multiple reflection of stress wave in the pile-cap interface effectively, and this test is more practical and more operable. This method should pay attention to the reasonable arrangement of the velocity sensors and try to shorten the vibration time, increase of the amplitude of force.