Determination of Friction Angles Between Soil and Steel - FRP Piles

Year 2018, Volume: 13 Issue: 1, 19 - 23, 01.03.2018

H. Suha Aksoy Mesut Gör , Esen İnal

Abstract

Forces of
friction between structure and soil are taken into account in the design of
geotechnical engineering constructions such as piles, retaining walls, sheet
piles and diaphragm walls. Although many studies were carried out about the
soil-structure interaction in recent years. 
However, in pile design, frictional forces are still calculated by using
the empirical formulas proposed in the first half of the 20th century.
Throughout history, wood was often used as friction piles. Steel piles are used
extensively in practice. Nowadays, in harsh environmental conditions
fiber-reinforced polymer (FRP) piles come into use in numerous cases.   As is known, the effect of pile point tip
resistance on the bearing capacity is ignored particularly in loose sands and
the bearing capacity is fully taken equal to the skin friction. Hence, it is
understood that correct determination of skin friction angle is very important
in engineering calculations. In this study, various ratios of low plasticity
clays (CL) were added to the sandy soil and compacted to standard Proctor
density. Thus, soils with various internal friction angles were obtained. By
performing interface shear tests (IST), skin friction angles of these soils
with steel (st37) and FRP were determined. Based on the data obtained from the
test results, a chart was proposed, which engineers can use in pile design. By
means of this chart, the skin friction angles of the soils, of which only the
internal friction angles are known, with steel and FRP materials can be
determined easily.

Keywords

Skin Friction; Design Chart; Pile Materials; Direct Shear Test

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