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Evaluation of full scale shear performance of tension anchor foundations: Load displacement curves and failure criteria

机译：张力锚基础的全尺寸剪切性能评估：荷载位移曲线和破坏准则

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摘要

One of the biggest challenges faced by the offshore wave and tidal energy industry is the high cost of constructing and installing offshore foundations. Foundations based on post tensioned pile anchors can be effectively proposed to tackle this issue. A series of full-scale direct shear tests were performed on-shore to evaluate the shear resistance of post-tensioned pile anchor foundations designed for securing tidal turbine devices to a rock seabed. We focused, in particular, on the primary shear resistance mechanism of post tensioned anchors, by applying a vertical force which mobilizes, a frictional force able to resist horizontal thrusts. Different load paths, involving monotonic or cyclic loading, were applied; several configurations for the footing of the foundation were tested. The footing stress-displacement behavior and the stress conditions at sliding failure from a number of different testing configurations were compared and analyzed. A marked consistency with the shear performance of natural rock joints was identified. This allows the behavior of tension pile foundations subjected to substantial horizontal loads to be modeled using relationships developed for rock joints, widely available in the literature. Additionally, the results obtained from different tests were also collated considering the various configurations adopted for the foundation-rock system and the applied load paths, to identify the factors that affect the shear resistance of the foundation.
机译：海上波浪和潮汐能行业面临的最大挑战之一是建造和安装海上基础的高成本。可以有效地提出基于后张桩锚的基础来解决这个问题。陆上进行了一系列的全面直接剪切试验，以评估后张桩桩锚基础的抗剪强度，这些基础设计用于将潮汐涡轮机设备固定到岩石海底。通过施加可移动的垂直力和能够抵抗水平推力的摩擦力，我们尤其专注于后张拉锚杆的主要抗剪机理。应用了涉及单调或循环加载的不同加载路径；测试了基础的几种配置。比较并分析了来自许多不同测试配置的立足应力位移行为和滑动破坏时的应力条件。与天然岩石节理的剪切性能具有明显的一致性。这允许使用在岩石节理上建立的关系来对承受实质水平载荷的抗拉桩基础的行为进行建模，这在文献中可广泛获得。另外，还考虑了基础-岩石系统采用的各种配置和所施加的载荷路径，整理了从不同测试中获得的结果，以确定影响基础抗剪力的因素。

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  • 来源
    《Ocean Engineering》 |2017年第1期|80-94|共15页
  • 作者

    Bergamo Paolo; Donohue Shane; Callan Damian; Holland Adam; McCarey John; Brown William; McSherry Michael; Ward Cillian; Amato Giuseppina; Sivakumar V.;

  • 作者单位

    Queens Univ Belfast, Sch Nat & Built Environm, Stranmillis Rd, Belfast BT9 5AG, Antrim, North Ireland|ETH, Schweizer Erdbebendienst, Sonneggstr 5, CH-8092 Zurich, Switzerland;

    Queens Univ Belfast, Sch Nat & Built Environm, Stranmillis Rd, Belfast BT9 5AG, Antrim, North Ireland;

    McLaughlin & Harvey Ltd, 15 Trench Rd, Newtownabbey BT36 4TY, North Ireland;

    McLaughlin & Harvey Ltd, 15 Trench Rd, Newtownabbey BT36 4TY, North Ireland|Fast Engn Ltd, 5 Windmill Court, Belfast BT41 2TX, Antrim, North Ireland;

    McLaughlin & Harvey Ltd, 15 Trench Rd, Newtownabbey BT36 4TY, North Ireland;

    McLaughlin & Harvey Ltd, 15 Trench Rd, Newtownabbey BT36 4TY, North Ireland|Gavin & Doherty Geosolut Engn UK Ltd, 7 Donegall Sq West, Belfast BT1 6JH, Antrim, North Ireland;

    McLaughlin & Harvey Ltd, 15 Trench Rd, Newtownabbey BT36 4TY, North Ireland;

    Queens Univ Belfast, Sch Nat & Built Environm, Stranmillis Rd, Belfast BT9 5AG, Antrim, North Ireland;

    Queens Univ Belfast, Sch Nat & Built Environm, Stranmillis Rd, Belfast BT9 5AG, Antrim, North Ireland;

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  • 正文语种 eng
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  • 关键词

    Post-tensioned anchor; Offshore foundation; Marine energy; Shear performance; Direct shear test; Full-scale testing;

    机译：后张锚;海洋基础;海洋能;剪切性能;直接剪切试验;全面试验;

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