Finite Element Analysis Of Rigid Pile Composite Foundation Under Seismic Load

Rigid pile composite foundation is a new foundation treatment method,which belongs to the category of foundation treatment and its core technology is cushion.Through the regulation of the cushion,the bearing capacity of the soil between piles are fully played,which together with the pile to bear the load from the upper structure.And the composite foundation of rigid pile composite foundation with respect to other forms,has greatly improved the bearing capacity of the foundation,the settlement is relatively small,has various advantages of great economic and social benefits,in recent years has been widely used in multi-storey and middle high rise building structures.The occurrence of sudden earthquake disaster has caused great damage to buildings,so the seismic study is necessary.Based on the ABAQUS finite element analysis software,9 different foundation treatment schemes are established to analyze the mechanical properties of the rigid pile composite foundation under the action of earthquake.The main contents of this essay are as follows:(1)According to the research content,the development background and research status of the rigid pile composite foundation are briefly described.The composition and bearing mechanism of the rigid pile composite foundation are discussed,the important position of the cushion in the rigid pile composite foundation is expounded and the relevant content of earthquake damage are briefly described.(2)The finite element method,ABAQUS and the detailed modeling process of the model are introduced,such as the basic assumptions,the selection of the unit,the constitutive model of the material,etc.,and the two points of attention in the modeling process are briefly described.(3)Under the premise of keeping the rigid pile unchanged,the performance analysis of the rigid pile composite foundation under different seismic action is carried out by establishing different foundation treatment scheme.These schemes respectively change the thickness and modulus of the cushion in the composite foundation of the rigid pile,the existence of the superstructure of the composite foundation and its size change,and the seismic intensity.According to the results of the finite element dynamic time history analysis,the mechanical properties and the changing behavior of the rigid pile composite foundation under different seismic action are obtained,and some concrete suggestions on the practical engineering are put forward.