EFFECT OF TAPERING ON SKIN FRICTION OF PILE OF VARYING LENGTH

Abstract

Development of building presents several problems related to the design and assessment of pile foundations. Specially tall buildingsbplay a key rolenin current urban strategies and regeneration. Among these combinations of vertical, lateral and torsional forces to the piles due to the eccentricity of wind action on vertical projections of multistoried tall buildings is of particular interest. The Design and analysis of pile foundation present a complex problem to the engineers because of several factors that affect the foundation behaviour. Such factors include mode of loading, soil properties, pile geometry, placement and method of construction .The mode and magnitude of loads transferred from the super structures will influence the selection of pile foundation to resist the imposed loads. Torsional forces are also acting on the pile and IS 2911 for pile foundation has not considered torsional forces for pile designing but it should be considered. Therefore, objectives of the present work are: (1) Mechanism of applying torque to piles. (2) Comparison of angle of twist and torsional strain energy between tapered pile and cylindrical pile of same diameter (3) Experimentally to examine basic pile soil interactions in the modal pile subjected to torque in the context of study torque/angle of twist. A mechanism of applying torque to a single pile was fabricated. Experiments on two piles were performed. Torque on piles was applied using the above said mechanism. Experiments were performed by increasing the depth of piles. When we increased the depth of pile at regular intervals with the different torques for increasing angle of twist till the failure angle of twist is achieved.