| 任意角度水平向荷载下现浇X形桩力学特性研究（II）：截面应力分布 |
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| 引用本文： | 孔纲强,周航,刘汉龙,丁选明.任意角度水平向荷载下现浇X形桩力学特性研究（II）：截面应力分布[J].岩土力学,2012,33(Z1):8-12. |
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| 作者姓名： | 孔纲强 周航 刘汉龙 丁选明 |
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| 作者单位： | 1. 河海大学 岩土力学与堤坝工程教育部重点实验室，南京 210098；2. 河海大学 土木与交通学院，南京 210098 |
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| 基金项目： | 国家自然科学基金青年项目资助(No.51008116),国家自然科学基金高铁联合基金资助(U1134207);教育部博士点基金资助(No.20100094110015) |
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| 摘 要： | 基于现浇X形桩在任意方向轴惯性矩控制方程和异形几何截面特性以及地基反力法的基本原理，分析X形桩在任意水平向荷载作用下截面应力分布规律及其控制参数变量对截面应力集中现象的影响规律，并与同等情况下等周长和等面积的圆形桩、方形桩的力学特性进行对比分析，提出考虑截面应力分布的X形截面设计最优化设计形式，为X形桩截面形式设计提供参考依据。研究结果表明，等面积情况下，X形桩截面的应力随着外包圆直径的增大而减小，随着开弧间距和开弧角度的减小而减小；等周长情况下，X形桩截面的应力随着外包圆直径的增大而减小，随着开弧间距和开弧角度的减小而减小。实际工程中建议外包圆直径可以取0.5～0.7 m左右，开弧间距取0.1～0.2 m左右，开弧角度采用110o～130o左右。
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| 关 键 词： | 水平向荷载 截面力学特性 现浇X形桩 应力分布 应力集中 |
| 收稿时间： | 2012-05-10 |
Research on mechanical properties of X-section cast-in-place concrete pile under arbitrary direction lateral load(Ⅱ):Section stress distribution |
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| KONG Gang-qiang,ZHOU Hang,LIU Han-long,DING Xuan-ming.Research on mechanical properties of X-section cast-in-place concrete pile under arbitrary direction lateral load(Ⅱ):Section stress distribution[J].Rock and Soil Mechanics,2012,33(Z1):8-12. |
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| Authors: | KONG Gang-qiang ZHOU Hang LIU Han-long DING Xuan-ming |
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| Institution: | 1. Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing 210098, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Base on the moment of inertia equation and sectional parameters,the X-section cast-in-place concrete pile(referred as to XCC pile) stress distribution and stress concentration equations under different directions lateral load were built;and influenced factor,such as,sectional parameters were analyzed.In order to comparatively analyze,the characteristics of circular piles and square pile with the same concrete amount or the same perimeters were carried out.Finally,one of optimized X-section type was proposed,which can be used for XCC pile design reference.The results show that,the maximum stress distribution increased with the decreasing of outsourcing diameter,the decreasing of open arc angle,and the increasing of open space with the same area.The maximum stress distribution increased with the decreasing of outsourcing diameter,the increasing of open arc angle,and the increasing of open space with the same perimeter.In this paper,0.5-0.7 m outsourcing diameter,0.1-0.2 m open space,and 110o-130o open arc angle can be chosen for recommended section parameters. |
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| Keywords: | lateral load mechanical property X-section cast-in-place pile stress distribution stress concentration |
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