1-g Scale Hydraulic Flume-based Soil-Fluid-Structure Model Testing and Evaluation of Surging and Scouring Effects

摘要

Flood and flood-induced scour have been long recognized as a leading cause of bridge failure to the river-crossing bridge inventory in the United States. Two other types of combined hydraulic impact and scour hazard that have drawn much attention are due to surging of ocean flow triggered by either seismic or hurricane energy. Regardless of the causes, the resulting scour greatly modifies the boundaries of the near-field soil for foundations. However, the combined effects of hydraulic impact and scouring on modification on structural characteristic have not been comprehensively studied. In this paper, we conduct a preliminary 1-g small scale experiment, wherein a generic foundation-structure system is placed in a laboratory flume channel and is subjected to forced vibration. Test results successfully reveal the formation of foundation scour, the failure of the structure, and the progressively modified dynamic characteristics of the soil-structure system.