Seismic Response Analysis Of Urban Viaduct With Soil-Road-Structure Interaction

In recent decades, several violent earthquakes occur in the world. These earthquakes cause huge losses of life and property, resulting in a large number of urban roads, urban viaduct and overpass damage. With the acceleration of china's urbanization, various types of complex underpass projects have been established. As an important part of urban transport lifeline, if urban bridges are seriously destroyed during an earthquake, it will not only cause huge economic losses, but also affect the smooth progress of relief work due to traffic interruption. And this may lead to serious social consequences.In the urban transport system, bridges and roads are two essential parts. When subjected to earthquake excitation, these two parts interact and affect each other. So considering the interaction between the two is significant important. In the paper, a three dimensional nonlinear finite element model of soil-pile-road-bridge structural system is established in the develop platform of ABAQUS. Then the model is calculated and analyzed in the case of with-road and no-road, and the influence of the road to the whole structural system is also discussed in the paper.In this paper, the lateral, longitudinal and vertical seismic response of the soil-pile-road-bridge structural system are calculated and analyzed separately. The results show that when subjected to horizontal earthquakes, the displacement of the deck and stress at the top of the piles in the case of with-road are less than that of no-road. But the vertical seismic response of the system is almost the same. The pile-soil contact pressure near road will increase when there exist pavement layer, and this will exert negative effects on the piles. The most dangerous regions of the bridge when subjected to earthquake action concentrate in the upper and lower parts of the piers. When considering the pile - soil interaction, the soil under the earthquake exhibits shear properties. The peak value of the relative displacement of soil near the pier decrease as the depth of the soil increase. And the displacement is smaller when considering the road effect.