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Behavior of short pile subjected to lateral load a. free b. fixed head
Source publication
Short rigid piles are widely used in situations where moment-carrying capacity is the dominant design requirement. Structures such as transmission towers, highway overhead signs, quays and train gantries are often supported by large diameter piers with high stiffness, which behave as short rigid piles. A short rigid pile fails by rotation, mobilizi...
Context in source publication
Context 1
... design of short piles is primarily governed by the lateral soil failure instead of the yielding of the pile material. The behavior of short pile subjected to lateral load is depicted in Figure 1. The structures supported on short piles withstand significant lateral loads and overturning moments, but relatively small vertical forces, which as a consequence is often neglected. ...
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Citations
... Later on, Carter and Kulhawy (1992) proposed limiting criteria for short pile based on the L/d ratio of the pile, considering the effective Young's modulus of the pile and equivalent shear modulus of the surrounding soil. (Bharathi et al. 2015) summarized a few literature on dynamic analysis of short piles. During a seismic event, the additional lateral loads will have a significant influence on the behavior of these piles. ...
Short rigid piles are preferably used to support structures such as transmission line towers, highway overhead signs, quays and train gantries where the moment-carrying capacity of the pile is dominant for design requirement. In the past researchers reported that the theoretical approaches, based on the modulus of subgrade reaction and elastic continuum reaction, for predicting the response of short piles are inappropriate because of small length/breadth (L/d) ratio. The design approaches for these piles are based either on empirical relations derived from full-scale tests or on conventional laboratory model tests with homogenous soil and arbitrary boundary conditions. Hence, to study the behavior of these short rigid piles, rigorous numerical analyses have been carried out using finite element method (FEM), as it permits realistic three-dimensional effects and computation of stresses and deformations in soil, pile and soil-pile interface.
In this paper, the dynamic lateral performance of short rigid reinforced concrete (RC) piles have been studied considering the effect of varying pile geometry in terms of different L/d ratios using FE package ABAQUS. In the first case, the length of the pile is varied to maintain the L/d ratio, whereas in the second case, the diameter of the pile is varied to maintain the L/d ratio. The results are compared in the form of variation of lateral displacement (dx) and bending moment (Mx) along the pile length.
The lateral response of short rigid piles installed in two different soil profiles (homogenous sand and homogenous clay) has been investigated in the present study. For this purpose, the geometry of the pile has been selected similar to themonopiles (which behaves as short rigid pile) used in the field of offshore engineering. The effects of the pile material, soil type and material model on the lateral behavior of the short rigid piles has been examined using three dimensional finite-element analyses.The lateral load capacities in the different soil conditions have been obtained using OPTUMG3 software which is based on finite element limit analysis. The results obtained shows that the lateral response of short rigid piles was significantly affected by the parameters considered. Concrete piles simulated as rigid and linear elastic material had insignificant effect on the lateralload. The lateral capacity of steel piles was slightly higher than the lateral capacity of concrete piles installed in sand. Concrete piles installed in both sand and clay showed significant increase in lateral capacity with the change in soil type.
