Effect of Surface Area of Fins on the Behaviour of Piles Under Combined Loading Conditions
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ORIGINAL PAPER
Effect of Surface Area of Fins on the Behaviour of Piles Under Combined Loading Conditions Rekha Ambi1
•
P. K. Jayasree1
•
N. Unnikrishnan2
Received: 17 December 2019 / Accepted: 12 October 2020 Ó Indian Geotechnical Society 2020
Abstract The conventional foundation design methods consider these loads independently. However, these loads often act together and their independent existence is rare. Finned piles are found to be a better alternative to monopiles in resisting lateral loads. Lateral load carrying capacity of the foundation is highly significant in the case of tall structures. In the present study, the response of finned piles to lateral loads under combined loading conditions has been investigated. Small-scale laboratory model tests were performed on monopiles and finned piles embedded in sand. The studies were carried out by varying the geometric factors such as length, width and area of the fins. From the studies, it was found that the lateral load carrying capacity of the finned piles increases considerably in comparison with monopiles. The tests revealed that the lateral capacity is a function of the surface area of fins. Under combined loading, a logarithmic relationship between the increase in lateral resistance capacity and the surface area of the fins was identified. Keywords Lateral load carrying capacity Piles and piling Finned piles
& N. Unnikrishnan [email protected] 1
Department of Civil Engineering, College of Engineering Trivandrum, Thiruvananthapuram, India
2
Department of Civil Engineering, Government Engineering College Trichur, Thrissur, India
Introduction Pile foundations are usually subjected to large environmental loads like wind loads and earthquake loads, which at times could exceed gravity load. The lateral resistance of pile foundations is reduced by environmental loads like strong winds [1]. Large lateral loads may necessitate bigger shaft dimensions than what is required to resist axial loads. Provision of structural fins near the pile top has found to enhance the lateral load carrying capacity of piles [2–4]. The additional size requirement of piles for resisting large lateral loads can thus be contained to a large extent. Foundations subjected to a combination of lateral and axial loads; [5–10] have pointed out the significance of combined axial and lateral loading on deep monopoles. An exhaustive literature survey revealed that the studies on the finned piles were limited to the effect of fins on lateral capacity under lateral loading only. There is need to understand the effect of fins on piles under combined loading. In the case of laterally loaded monopoles, lateral deflection, shear force and bending moment were found to be maximum near the pile head [11, 12]. The conventional method to enhance lateral resistance of monopiles is to improve the strength of soil around the pile using suitable ground improvement technique such as compaction. Tapered piles are also preferred due to their positive effect on compaction and also due to the
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