鉛直力を受ける鋼管杭の水平挙動に関する非線形解析法 : その1:単杭について

Abstract

An analytical method for the lateral behavior of steel pipe piles axially and laterally loaded to failure is presened. This analysis is similar in principle to that previously developed for laterally loaded single piles and pile groups, in which the continuity and local yield of soil mass are taken into account. In the analysis presentd, however, the method of incremental displacement is used to predict the nonlinear behavior up to failure due to yielding of soil and pile. This paper is the first and deals with the problem of single piles. In the second paper, the behavior of pile groups is examined. The present analysis is applied to the examples of general steel pipe pile (diameter of 500mm) in relatively loose sand. The results of these parametric studies can be summerized as follows. 1) The vertical force influences the lateral behavior of piles, and maximum lateral resistance and displacement decrease with increasing vertical force at pile head. 2) Because of additional moment caused by pile deflection at relatively high vertical load levels (P≧200 tf), the lateral load-displacement curve has a peak and the considerable reduction in lateral resistance occurs when displacement exceeds that at the peak state, especially for free head pile. 3) For P=200 tf, both the maximum and ultimate lateral resistance decrease as the height of pile head above the groundline increases. 4) The lateral response of piles is collectively influenced by both the soil modulus and distribution of the yield soil reaction.