Study On Dynamic Interaction Of Soil-Pile And Bridge Structure Under Earthquake

The continuous improvement of the seismic performance of bridges not only has a very important influence on the lives and wealth of the people,but also relates to the long-term development of transportation,rescue,and the national economy.It is even of great significance to the country's strategic aspects.In order to make the bridges have better seismic performance in earthquake.It is very important that reasonable and accurate seismic analysis of bridge structure.The dynamic interaction of soil-pile-bridge structure under earthquake is a hot topic in bridge seismic research,and it is also a difficult point.Which has been deeply studied and explored in many countries.In this paper,a finite element model that considering the soil-pile-bridge interaction and without considering the pile-soil interaction is established by using the ABAQUS finite element software.Modeling method by using beam element:the reinforced concrete using Concrete02 constitutive model.Calculation of pile soil interaction by using M model calculation,bridge bearing by using spring model simulation,bearing platform by ueing Concentrating mass block simulation.And modal analysis is carried out at the same time using near field El-Centro wave and far field wave El-Centro wave Northridge wave are used for time history analysis to study on bridge structure design considering pile-soil interaction under seismic action.Considering the interaction of soil-pile-bridge structure,the frequency of the bridge structure decreases and the period increases,which reflects the flexible characteristics of the bridge structure,while considering the pile-soil interaction,The acceleration response of bridge pier and bridge superstructure can be reduced.It shows that considering the pile and soil interaction,it can reflect the actual situation of the bridge more truly.It compared with the calculated conservatism of pier bottom consolidation,the economic benefit is more largely improved than pier bottom consolidation.Moreover,with the filtering effect of soil on seismic waves,the frequency of foundation decreases,and the deformation of soil affects the stress state of the pier,which leads to the increase of the relative displacement of the structure.In addition,under the action of different seismic waves,the effect on the stress of the superstructure and the substructure of the bridge is also different.Based on the parametric analysis of the interaction between soil-pile and bridge structure,the influence of the bridge structure on the dynamic load and deformationcharacteristics of the pier under seismic action is considered respectively when the thickness of the soft soil is changed,the location of the soft soil is changed,and the pile length and pile diameter change.Thus,the selection of bridge structure site and the reasonable arrangement of bridge structure are further recognized and understood.In this way,the bridge construction has a more comprehensive analysis and grasp.In this paper,ABAQUS finite element software is used for modeling and analysis of bridge structure.It also has a certain reference value for finite element analysis of bridge structure and modeling of bridge structure.