Pullout Capacity of Anchor Piles

 

Nihar Ranjan Patra

Lecturer, Department of Civil Engineering,
Indian Institute of Technology, Kanpur, India
e-mail: nrpatra@iitk.ac.in

Muvunyi Deograthias

and

Muyango James

Former graduate students, Kigali Institute of Science,
Technology and Management (KIST), Kigali, Rwanda

ABSTRACT

Experimental investigations on the behaviour of model enlarged base piles, embedded in layered sand and homogeneous sand subjected to axial pulling loads and oblique pulling loads respectively have been carried out in a model tank of size 914mm X 914mm X 762mm. Mild-steel bars of diameter 12 mm and 16 mm having embedment length to diameter ratios (L/d) 25, 30 and 20 respectively are used as model piles. Mild steel circular disc of 10mm thickness has been used for providing enlargement at the base of the piles. The base enlargement ratios (B/d) were 1, 2 and 3. Dry sand, obtained from the local market, of specific gravity 2.61, uniformity coefficient 1.1, emax= 0.8, emin= 0.49 has been used as foundation medium. The relative densities of sand used as foundation medium were dense over medium dense and medium dense over dense conditions for anchors under axial pulling loads and dense condition for anchors under oblique pulling loads respectively. The corresponding angles of shearing resistance for medium dense and dense conditions were 380,400. Based on the experimental results, the influence of the layering system and the load inclination angles have been investigated on load-displacement and ultimate resistance of enlarged based piles subjected to axial pulling loads and oblique pulling loads. Relevant conclusions are drawn from the study

Keywords: Anchor Piles, Sand, Pulling Resistance, Oblique Pulling Resistance, Ultimate Resistance.

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