DESIGN METHOD CONSIDERING EFFECT OF DISTRIBUTIONAL PERIPHERAL SURFACE FRICTIONAL FORCE OF PILE FOUNDATION COMPRISING MANY PILE MEMBERS

摘要

PROBLEM TO BE SOLVED: To reflect frictional force working on the peripheral surface of a pile member, in calculation for stability and behavior of a foundation structure. SOLUTION: Strength of distribution peripheral surface frictional forceτZand a range of distributed stratum are set in the same way as general setting of design external force to design a foundation. The effects of action (the action ofτZN) resisting the axial deformation of the whole foundation, action (the action ofτZϕ) resisting the flexural deformation of the whole foundation, and action (the action ofτZθ) resisting the member flexural deformation of each member are reflected in a balanced manner to the components of resultant force of each cross-sectional force of the whole foundation, and a solution of a displacement function of an obtained equation is used for a design calculation expression. The former two action (the action ofτZNandτZϕ) out of three kinds of action of the distribution peripheral surface frictional forceτZhas an effect of reducing the axial force of the pile. In the case of obtaining economical efficiency by reducing the axial force of the pile from the viewpoint of business, an expression reflecting the former two action is used to obtain a simple way of handling. These design methods are useful for the rational and economical design of the pile foundation. COPYRIGHT: (C)2008,JPO&INPIT