Date of Award
Doctor of Philosophy
Civil, Construction, and Environmental Engineering
This investigation is concerned with a static nonlinear analysis of piles in integral abutment bridges by finite element method. To study piles in integral abutment bridges, a finite element program for the soil-pile system was developed (1) with materially and geometrically nonlinear, two- and three-dimensional beam elements and (2) with a nonlinear, Winkler soil model with vertical, lateral, and pile tip springs;Pile loads are incremented monotonically in small increments and corrective iterations within the increments are performed until equilibrium convergence is achieved. The model was verified by comparison to several analytical and experimental examples;Analytical examples are presented to illustrate the effect of lateral displacements on the ultimate load capacity of a pile. These examples include friction and end-bearing piles; steel, concrete, and timber piles; and bending about the weak, strong, and 45(DEGREES) axis for H piles. The effects of cyclic loading are shown for skewed and non-skewed bridges. The results show that the capacity of friction piles is not significantly affected by lateral displacements, but the capacity of end-bearing piles is reduced. Further results show that the longitudinal expansion of the bridge can introduce a vertical preload on the pile.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Yang, Pe-Shen, "Nonlinear finite element analysis of piles in integral abutment bridges" (1984). Retrospective Theses and Dissertations. 8231.