Study On Seismic Response And Destruction Mode Of Bridge Abutment In Liquefiable Region

In a lot of bridge damage, the bridge abutment damage is the main damage form, and these are often accompany by destruction of large ground deformation caused by sand liquefaction. Bridge abutment is an important construction connect bridge and embankment, occupy a very important position in the whole structure of the bridge. Bridge abutment damage not only cause the loss of its function, but also may lead to fall beams and other damage, and eventually lead to the bridge collapse. To explore liquefiable region bridge abutment failure mechanism and dynamic response of under the action of seismic, put forward reasonable for bridge abutment seismic design method of liquefiable region. This paper through consulting a large number of domestic and foreign literature, based on the research status of liquefiable region for seismic destruction mode bridge abutment depth analysis in order to investigate the liquefiable region bridge abutment destruction mode and its seismic response. In this paper, using the finite element program UWLC numerical simulation Shengli bridge. The main content and understandings obtained are as follows:(1) Preliminary summarized characteristics of liquefiable region bridge abutment damage and influence factors. Through a large number of seismic damage investigation and data consulting, the bridge abutment seismic damage characteristics of liquefiable region have a preliminary understanding. The abutment may affect liquefiable region is analyzed the main factors of seismic destruction mode. Including:Beam lateral force, large ground displacement induced by liquefaction and seismic properties.(2) Based on UWLC finite element numerical simulation platform, aiming at the finished shaking table tests, a finite element model is builded of bridge abutment landslide shaking table tests, using a fully coupled dynamic effective stress analysis. The numerical simulates results demonstrate:the simulation results match well with the test results, a generalized plasticity model is used to simulate cyclic mobility and liquefaction behavior of saturated sands, indirect proof UWLC software usability and the correctness of the model.(3) Combining with an instance of the Shengli bridge seismic damage, using numerical analysis method to simulate the damage process of Shengli bridge, the influence factors of gravity bridge abutment and seismic response is analysed. The numerical simulates results demonstrate:after considering the binding effect of the beam, the simulation results consistent with the observed values, meanwhile the beam lateral force, liquefied layer thickness, beam weight, peak ground acceleration and liquefied layer depth have an impact on the gravity bridge abutment destruction mode. The soil-cement is a kind of good liquefaction governance measures. The outcome could reflect the dynamic response under seismic liquefiable region abutment, for liquefiable region bridge abutment seismic theoretical calculations provide a good basis.(4) Building liquefiable region pile abutments numerical model, the beam lateral force and liquefied layer thickness the influence on seismic destruction mode of pile bridge abutment and seismic response of pile bridge abutment is analysed. The numerical simulates results demonstrate:the beam lateral force and liquefied layer thickness have an impact on the pile abutment destruction mode.