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

OCEAN ENGINEERING

卷:131

Article

Bergamo, Paolo^1,3  Donohue, Shane¹  Callan, Damian²  Holland, Adam^2,4  McCarey, John²  Brown, William^2,5  McSherry, Michael²  Amato, Giuseppina¹  Sivakumar, V.¹ 

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

[2] McLaughlin & Harvey Ltd, 15 Trench Rd, Newtownabbey BT36 4TY, North Ireland

[3] ETH, Schweizer Erdbebendienst, Sonneggstr 5, CH-8092 Zurich, Switzerland

[4] Fast Engn Ltd, 5 Windmill Court, Belfast BT41 2TX, Antrim, North Ireland

[5] Gavin & Doherty Geosolut Engn UK Ltd, 7 Donegall Sq West, Belfast BT1 6JH, Antrim, North Ireland

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

DOI  :  10.1016/j.oceaneng.2016.12.033

来源: Elsevier

【 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.

【 授权许可】

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