锚桩受拉构件采用钢绞线的单桩静载试验及分析
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摘要
采用钢绞线作为锚桩的抗拉构件具有安装方便,易于控制各钢绞线均匀受力,抗拉强度大等优点,且可节约安装工期,节省材料费。静载试验得到的Q-s曲线呈缓变形加载到最大加载荷载时,沉降20.42 mm,试桩未破坏,卸载后沉降为18.60 mm;桩身轴力从桩顶到桩底逐渐减小,土体的摩阻力可自上而下发挥,在工作荷载12 000 kN时,端阻力仅81.26 kN,为桩顶荷载的0.6%,荷载几乎全部由侧摩阻力承担。
The tensile member using the steel strand as the anchor pile has the advantages of convenient installation, easy control of uniform stress of each steel strand, large tensile strength, etc., and can save installation time and save material cost. When the Q-s curve obtained by static load test is slowly deformed and loaded to the maximum load, the settlement is 20.42 mm, the test pile is not damaged, and the settlement after unloading is 18.60 mm; the axial force of the pile gradually decreases from the top of the pile to the bottom of the pile, and the soil. The frictional resistance can be exerted from top to bottom. At a working load of 12 000 kN, the end resistance is only 81.26 kN, which is 0.6% of the pile top load. The load is almost entirely borne by the side frictional resistance.
The tensile member using the steel strand as the anchor pile has the advantages of convenient installation, easy control of uniform stress of each steel strand, large tensile strength, etc., and can save installation time and save material cost. When the Q-s curve obtained by static load test is slowly deformed and loaded to the maximum load, the settlement is 20.42 mm, the test pile is not damaged, and the settlement after unloading is 18.60 mm; the axial force of the pile gradually decreases from the top of the pile to the bottom of the pile, and the soil. The frictional resistance can be exerted from top to bottom. At a working load of 12 000 kN, the end resistance is only 81.26 kN, which is 0.6% of the pile top load. The load is almost entirely borne by the side frictional resistance.
引文
[1]陈永贵,周德泉,毛广凌.钻孔扩底灌注桩的承载性状与设计计算[J].建筑技术,2008(12):957–959.
[2]杜毛毛,苏小卒,赵勇.带肋钢筋和钢绞线黏结性能试验研究[J].建筑材料学报,2010(2):175–181.
[3]郝庆多,王言磊,欧进萍.GFRP/钢绞线复合筋黏结锚固试验研究及设计建议[J].土木工程学报,2008(4):40–48.
[4]建筑地基基础设计规范:GB 50007—2011[S].
[5]建筑桩基技术规范:JGJ 94—2008[S].
[6]建筑基桩检测技术规范:JGJ 106—2014[S].
[2]杜毛毛,苏小卒,赵勇.带肋钢筋和钢绞线黏结性能试验研究[J].建筑材料学报,2010(2):175–181.
[3]郝庆多,王言磊,欧进萍.GFRP/钢绞线复合筋黏结锚固试验研究及设计建议[J].土木工程学报,2008(4):40–48.
[4]建筑地基基础设计规范:GB 50007—2011[S].
[5]建筑桩基技术规范:JGJ 94—2008[S].
[6]建筑基桩检测技术规范:JGJ 106—2014[S].