Seismic Response Analysis Of Self-anchored Bridge Considering Soil-pile Interaction

The main cable anchored at the ends of the beam is the character of self-anchored suspension bridge, omitted the anchorage at the end of the bridge. This is conducive to the construction of the geological conditions harsh and not suitable for the construction of gravity anchorage areas. Our country has occur much earthquake, high losses caused by the earthquake accounted for the proportion of natural catastrophe losses. The bridge in this artical is located in Panjin, due to the regional geological construct and other reasons, Panjin become the main distribution area along the coast of the northeastern region of soft soil. Therefore, seismic analysis the bridge constructed on the soft ground has important significance.In this artical, a main span of180m self-anchored suspension bridge as the research object, carry out the finite element structural analysis. Systematic study the pile-soil interaction and ground motion parameters and other factors on the bridge dynamic characteristics and seismic response.This artical reviews the setting up and solving dynamic equations of classical theory first. Using Midas Civil establish finite element model of a main span of concrete self-anchored suspension bridge-Panjin latitude180m of a river bridge. Finite element model is divided into two type, one to build models using m pile-soil method, another pile-soil model established using p-y curve method. Analyzed the vibration characteristics of the m pile-soil method modle, receive the top100bands and corresponding vibration mode frequency. Compare the differences between the end of consolidation model and pile-soil interaction model of the vibration characteristics.By using response spectrum method analysis the m method of pile-soil model, preliminarily understanding of the strength of its seismic response. After further expounded the basic theory and method to generate artificial seismic waves, and by adjusting the actual seismic recording method to generate artificial waves fitting response spectrum and choose artificial wave as input. By using seismic time history method analysis p-y curve method model, compare the m and p-y curve method model analysis results of time history analysis. We found that for a relatively long period longitudinal self-anchored suspension bridge, two results are similar. Again,in this artical, we analysis this two models under a rare earthquake time history. Compared the results of the two models,we found the displacement different and the forces analogous.