Shaking table test study on seismic dynamic response of bridge pier foundation passing through landslide body orthogonally

Geological hazards such as earthquakes and landslides are often encountered in bridge construction. Therefore, a 1:100 similar ratio shaking table test is carried out to simulate the dynamic response characteristics of pier structure in the area where the bridge structure is passing through the landslide. Under the premise of satisfying the similar law, the seismic waves with different acceleration amplitudes are input as the basement excitation.Additionally, the three dynamic response parameters of acceleration, strain and earth pressure at the bridge piers are monitored. By analyzing the dynamic response of acceleration, strain and earth pressure at the bridge pier, the following conclusions are obtained:(1) The peak strain at the measuring point at the pier shows that the peak strain at the measuring point on the slope path is the smallest. Furthermore, different locations of the same pier are affected by seismic waves, which shows that the vibration response of the upper end is more intense, showing that the vibration response of the upper end is more intense. (2) The magnitudes of acceleration and peak earth pressure at the bridge piers are positively correlated with the intensity of the loaded seismic waves. (3) The correlation coefficients of acceleration and strain peaks at both the front and rear piers are greater than 0.8, with very strong correlation. This indicates that the selection of pier spacing in the model test meets the bridge design requirements and can provide a reference for bridge engineering construction. (4) According to the strain conversion at the pier, the pier will have a certain creep deformation under the action of seismic wave. The top deformation of the pier is the largest and the bottom deformation is the smallest. In practical engineering, the use of seismic materials should be selected in combination with this feature. (5) The filtering effect of the sliding zone material is stronger than that of the sliding body and bedrock material, which is reflected by the weaker vibration response of the measurement points located in the slip zone. © 2021, Science Press. All right reserved.