Numerical Simulation Of Soil-structure Interaction Hybrid Testing Method

Earthquake, which imperils human life and property security all the time, is one of the most dangerous natural disasters confronted by human. Several large earthquakes happened in recent years have shown that lots of troubles were brought due to the damages of bridges. It is more difficult to rescue the victims for the breakage of lifeline structures and then increase the secondary damage largely. Cable-stayed bridges are one of types of long-span bridges and play an important role in lifeline engineering, with more and more seismic damages of all kinds of long-span cable-stayed bridges, the effect of the pile-soil-structure interaction on seismic response of cable-stayed bridge has also attracted attention.The dynamic pile-soil-structure interaction research is a front subject in the field of current civil engineering. Considering the double impacts of favorable and unfavorable nature of the dynamic pile-soil-structure interaction on seismic response of structure, carrying out dynamic soil-structure interaction analysis has double significance: guaranteeing the structural safely and saving construction investment. However, only with the existed theory research results, we can't confirm whether pile-soil-structure interaction has advantageous effect on the cable-stayed bridge's seismic response or not because of the complexity of the dynamic pile-soil-structure analysis. So this dissertation with Harbin Sifangtai bridge as the prototype, preliminarily studies its seismic responses under the pile-soil-bridge interaction . the main contents consist of the following:1. The hybrid test method of pile-soil-structure interaction is proposed, its test principle is studied, this research idea can solve carrying capacity of the vibration table and the limitation of table size on the test of long-span cable-stayed structures and then reduce the cost of the vibration table test for the large-scale model.2. The bridge tower model whose bottom is consolidated is established using ABAQUS finite element analysis software and its structural responses is analyzed under the actions of the near-field and far-field ground motions, the two seismic response characteristics are compared.3. The influence of soil-pile-superstructure-interaction on seismic performance of cable-stayed bridge is investigated by numerical simulation to analyze the two seismic response of the model under the actions of near-field and far-field ground motions, the influence of the pile-soil-structure interaction on the cable-stayed bridge seismic response of the bridge tower is researched and compared. The study analyzed the differences between the two models, obtained the appropriate conclusions.