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中文摘要：
现浇X形桩是为了提高单位混凝土承载力性能而开发的一种新型桩,异形横截面在确保桩周周长的前提下,能有效地减少混凝土用量;但目前针对异形横截面对水平向承载力特性影响方面的研究相对较少。基于X形横截面的3个控制参数：外包圆直径、开弧间距和开弧弧度,建立任意方向轴惯性矩控制方程,并分析X形横截面3个控制参数对截面轴惯性矩的影响规律。最后,提出控制截面面积或周长情况下X形截面惯性矩的最优化设计方案。研究结果表明,X形截面惯性矩随着开弧角度、开弧间距的减小而增大,随着外包圆直径的增大而增大。因此,在等混凝土材料用量或者控制桩周长情况下,适当增大外包圆直径、减小开弧角度和开弧间距有利于提高X形截面轴惯性矩,从而提高X形桩整体水平向承载力。
英文摘要：
X-section cast-in-place concrete pile（XCC pile） can save concrete usage under the same pile perimeter.However,there were relative little studies of the lateral bearing capacity affected by X sectional shape.Based on three key control sectional parameters（outsourcing diameter,open space,and open arc angle）,the moment of inertia equation under arbitrary direction axis are built.Then,the moment of inertia influenced by sectional parameters are discussed.Finally,optimized X section type is proposed,of which the moment of inertia can be improved with the same areas or perimeter.The results show that,the moment of inertia increased with outsourcing diameter increasing,open arc degree decreasing,and open space decreasing.Hence,appropriate increase outsourcing diameter,and reduce opening angle and arc,can help improving the moment of inertia,thereby improving the overall bearing capacity of X-section cast-in-place concrete pile.
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