一、引言随着海上采油钻井平台和外海码头的兴建,垂直打入的大直径钢管桩和空心钢筋混凝土桩得到普遍应用,由于承受的侧向荷载较大,桩产生较大的挠曲变形,桩前土体呈弹塑性状态。以往的线性分析方法(如m法、K法等)已不能准确地反映桩土的相互作用,因此侧向荷载桩的非线性分析成为令人关注的课题。 I. INTRODUCTION With the construction of offshore oil drilling platforms and offshore terminals, the large diameter steel pipe piles and hollow reinforced concrete piles penetrating vertically are widely used. Because of the large lateral loads, the piles produce large deflection , The pile before the soil was elastoplastic state. The past linear analysis methods (such as m method, K method, etc.) can not accurately reflect the interaction between pile and soil, so the nonlinear analysis of lateral load pile becomes an issue of concern.