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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 73
PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON CIVIL AND STRUCTURAL ENGINEERING COMPUTING Edited by: B.H.V. Topping
Paper 112
Subgrade Modulus for Laterally Loaded Piles W.D. Guo
Department of Civil Engineering, Monash University, Clayton, Victoria, Australia Full Bibliographic Reference for this paper
W.D. Guo, "Subgrade Modulus for Laterally Loaded Piles", in B.H.V. Topping, (Editor), "Proceedings of the Eighth International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 112, 2001. doi:10.4203/ccp.73.112
Keywords: piles, closed-form solutions, lateral loading, soil-structure interaction.
Summary
Closed-form solutions for laterally loaded piles have been established recently,
accounting for various head and base conditions. The solutions are based on load
transfer approach by simplifying the pile-soil interaction as independent springs along
the pile shaft and at the pile base. The key of the approach is the determination of the
subgrade modulus for the springs. Although a few expressions originally developed
for beam analysis were used for the determination, the usage has not been rigorously
verified. In this paper, the rationality of the usage has been examined in comparison
with various numerical results available. Particularly the accuracy and sufficiency of
the load transfer approach and the coupling effect has been explored in detail.
Rigorous expressions for lateral pile analysis, and the determination of subgrade
modulus, and the coupling effect are provided.
A number of simple solutions were developed for laterally loaded piles using an
empirical load transfer ( The modulus for the springs was obtained through fitting with relevant rigorous numerical solutions [3,4]. The problem is that the fitting to different reactions (e.g. deflection or moment of a beam or a pile) generally leads to different values of modulus. This difference in modulus implies that the uncoupled model is not sufficiently accurate for simulating the pile-soil interaction. The available experiments demonstrate that the displacement field around a laterally loaded pile is significantly different from that around a beam sitting on an elastic medium [5,6]. Unfortunately, rigorous guidelines about the estimation of the modulus are not available for lateral piles.
Recently, a new model was developed [7], which is based on both an assumed
displacement pattern and a rational stress field, and is represented through two
parameters: modulus of subgrade reaction, In this paper, with the new closed form solutions for lateral piles, the adequacy of using the available expressions [2,3,4,7] for modulus of subgrade reaction has been explored, in comparison with various numerical solutions. The comparison demonstrates that
References
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