Static Analysis of Precast Concrete Piles using Resonance Moment–Displacement Method

Abstract

This paper presents the results of static analysis of circular precast single piles from critical buckling load by resonance moment-displacement approach. The circular precast single piles of different support conditions; pinned-pinned, fixed-fixed, and fixed-pinned were investigated. The critical buckling load was evaluated as the resonance moment-total deflection ratio. A computer program coded in basic language was invoked to carry out a composite analysis of single piles from critical buckling load through computer evaluation of displacements and linear elastic stiffness of the pile. It was found that for a pinned-pinned single pile, the critical buckling load decreased with increase in circular frequency; for a fixed-fixed single pile, the critical buckling load decreased with decrease in the circular frequency and for the fixed-pinned single pile has the combined characteristics of both fixed-fixed and pinned-pinned end conditions that the critical buckling load decreased with decrease in the circular frequency to the half-length of the pile, and then increased with decrease in circular frequency in the remaining half-length of pile. It was also found that At Pcr/Pe = 1.000, Pcr = 113,475.70 N and ω = 2.06 rad/sec for a pin-ended pile, at Pcr/Pe = 4.000; Pcr = 453,485.82N, ω = 6.05 (rad/sec) for a fixed-fixed pile and at Pcr/Pe =2.05, Pcr = 232,470.17 N, ω = 4.56 rad/sec for a fixed-pinned pile.

Keywords: Support conditions, precast single pile, critical buckling load, moment–displacement approach, composite analysis, total deflection ratio

Cite this Article: Nwofor T.C., Sule S., Ihuanne E.N. Static Analysis of Precast Concrete Piles using Resonance Moment–Displacement Method. International Journal of Structural Engineering and Analysis. 2020; 6(1): 52–61p.