Study On Calculating Method Of Piled Raft Foundations For Tube Structure

As a kind of layout plan, tube structure is widely applied due to its commodious room and reasonable structure loading. Its appearance has brought high-rise building into a new history period. Piled raft foundations have advantages of pile and plate foundations. Pile and raft take the load of buildings together. It possesses good whole, high vertical capacity, small settlement of foundation and well performance of balancing differential settlements. It could bear large wind or seismic induced horizon load, and could have large capacity of resisting inclination. Therefore, the study of calculating method on tube-structure piled raft foundation has great social effects and economical profits.Corrective level of calculation and analysis on foundation projects is determined by the choice of subsoil model and computation parameter for subsoil models, and there is the interaction of tube upper structure -piled raft-subsoil system. In this paper, we introduce in detail some kinds of views how to choose subsoil models correctly and how to determine computation parameters for subsoil models, and we analyze their system with reaction theory and establish balancing matrix equation of pile-raft interaction.As a kind of dispersed numerical value method, the finite element is of approximate methods, and is based on principle of variation. In designing and calculating plate of piled-raft foundation, thick-plate theory has been applied, that is, thick-plate finite element method is mainly used when load and deformation of plate are analyzed. On research of piled foundation, elastic mechanics and finite element method are also used in this paper, its analyzing method is elementarily similar to thick-plate finite element. Furthermore, structural analyzing software ANSYS is briefly introduced in this paper.In this paper the 8-nodes 6-planes solid element (solid45) is applied toanalyze plate and pile, and we give priority to analyzing plate. When reinforced concrete upper structure-piled raft -subsoil system is studied, every part of this system is looked upon homogeneous discrete space. Accofding to static equivalent principle, equivalent node loads are calculated, and load embattle is integrated with element equivalent node force and directly bearing load...