Abstract
This paper introduces an experimental study to clarify the response of steel pile models exposed to the cyclic loading. Thirty six models of two types of steel piles are tested (open ended pile and H-pile) with lengths equal to (30, 40, and 50) cm. Three diameters (2.5, 3.5, and 4.1) cm for open ended pipe pile and three flange widths (2.6, 3.6, and 4.4) cm for H-pile are investigated. Jacking technique is employed to installed piles models in dry sandy samples with two different relative densities (60% for medium sand 80% for dense sand). It is found that the pile geometry (diameter and length) with sand density have a high impact on the number of cycles. Analysis of results showed that increasing of pile diameter and relative density cause a reduction in the number of cycles when the length of steel pile models are fixed while variety of diameters of open ended pipe pile has a small effect on the number of cycles. It was found that pipe piles with open ended have more resistance to the cyclic loading compared with H piles under the same geometric conditions (pile diameter, embedded length and sand density) especially in medium sand. Finally, if the testing conditions are the same, number of cycles is decreased with increasing in amplitude loading
Highlights
Many permanent deformations are developed in soil when exposures to cyclic loading which causes serious problems as well as excessive settlement or liquefaction due to a build-up of excess pore water pressure[1]
The effect of cyclic loading may be transmitted to the soil surrounding piles resulting significant rotation or deformation during the piles life which not taking in consideration in design
The outcomes of these tests showed that the displacement of piles under cyclic loading divided into a transitory stage, which refers to an immediate response of the soil to the cyclic stresses and a cyclic creep stage
Summary
Many permanent deformations are developed in soil when exposures to cyclic loading which causes serious problems as well as excessive settlement or liquefaction due to a build-up of excess pore water pressure (di Prisco and Wood 2012)[1]. Puech et al, (1982) [2] conducted a cyclic tensile load on steel piles embedded in silts and loose sands These tests were performed on 27.3cm diameter and 130 cm long piles. Poulos (1984, 1989a and 1989b) [3, 4, and 5] made experimental and analytical studies on the small piles models in sand The results of these studies showed that the cyclic deterioration of skin friction is controlled by the amplitude of cyclic displacement, relative to a critical displacement. Yu et al (2006) [9] studied the behavior of jacking Hpile embedded in dense sand under cyclic loading They showed that the effect of previous loading cycles on pilesoil stiffness and load distribution was insignificant.
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