混凝土薄壁筒桩水平受力机理

对混凝土薄壁筒桩的水平承载能力按规范方法进行了现场试验，并用三维非线性有限元对其在水平荷载分级作用下桩体的变形、应力，钢筋应力及土体对桩体的水平反力等的变化规律进行了分析研究，两者结果相互验证．有限元分析中考虑了不同材料的材料特性、变形特性及桩与混凝土之间的相互作用．研究结果表明混凝土薄壁筒桩在水平荷载作用下表现为受弯混凝土构件的特性，在一定的地基条件下其承载能力主要取决于混凝土和钢筋的抗拉强度；同时表明用文中的方法分析混凝土薄壁筒桩的水平承载能力是可行的．

Horizontal bearing mechanism of thin-walled concrete cylindrical piles

According to specification method, an in-situ test was made to demonstrate the horizontal bearing capacity of thin-walled concrete cylindrical piles. Three-dimensional nonlinear finite element method was applied to an in-depth analysis of the deformation and stress of piles, stress of reinforced bars and reaction of soil mass against piles under different levels of horizontal loads. The results were compared to those of in-situ test. The deformation characteristics of different materials and their interactions with foundation soil were considered. The result shows that thin-walled concrete cylindrical piles under the effect of horizontal load bear similar characteristics of bending concrete components. With related conditions of foundation, the load bearing capacity is mainly determined by the tensile strengths of concrete and bar. The result also proves that it is practical to analyze the horizontal load capacity of thin-walled concrete cylindrical piles by the way mentioned.