SIMPLIFIED DESIGN OF SINGLE PILES UNDER （下的单桩的简化设计）.pdfVIP

Paper No. SDOVA SIMPLIFIED DESIGN OF SINGLE PILES UNDER LIQUEFACTION INDUCED LATERAL SRPEADING 1 2 3 Alexandros VALSAMIS , George BOUCKOVALAS , Yannis CHALOULOS WITH CORRECTED FIGURES 2 3 Jan. 17, 2010 ABSTRACT Extensive damage to pile-supported structures has been witnessed in several recent earthquakes (Chi-Chi 1999, Kobe 1995, etc), as a result of liquefaction-induced large horizontal displacements of slightly sloping ground or near free-face topographic irregularities. This paper presents multi-variable design charts and relationships for the preliminary computation of maximum pile head displacement and bending moment in the case of single piles subjected to such lateral spreading of the natural ground. The charts were developed on the basis of “theory guided” statistical analysis of numerical predictions from a large number of parametric studies, where the pile–soil interraction is modelled through an advanced non linear “Beam on Winkler foundation” or P-y model. Three different combinations (design cases) of pile head constraints and soil conditions were considered, which are commonly encountered in practice. Keywords: Design of piles, Liquefaction, Lateral Spreading, P-y method INTRODUCTION One of the most damaging effects of earthquake-induced soil liquefaction is the lateral spreading of soils, where large areas of ground move horizontally, to lengths ranging from some centimeters to a few meters. This phenomenon may occur in the case of