Abstract
A state-of-the-art nonlinear finite element algorithm for pile-soil interaction has been developed and implemented in a modular computer program to study the effects of predrilled oversize holes and layered soils on the vertical load carrying capacity of piles in integral abutment bridges where thermally induced lateral movements occur. A 40-ft (12 m) H pile embedded in very stiff clay is used to study the effect of a predrilled oversize hole with or without sand fill. Numerical results showed that the vertical load carrying capacity of H piles is significantly affected by predrilling. The study of layered soils included the case where compacted soil (50 or more blow counts in standard penetration tests) is used as a fill on top of different layers of natural soil. For such cases, the numerical results indicated that the type of failure is greatly influenced by depth of the compacted soil.
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