Faithin Omaha eBook Collection

Download or read book Dynamic Nonlinear Analysis of Pile Foundations Using Finite Element Method in the Time Domain written by and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A quasi-three-dimensional method of analysis is presented for the nonlinear dynamic analysis of single piles and pile groups. The analysis is performed in the time domain using strain-dependent moduli and damping, yielding at failure, and a no-tension cutoff. The analysis has been incorporated into the computer program PILE-3D and has been validated using data from centrifuge tests on a single pile and a 2 X 2 pile group under simulated earthquake loading. Analyses of the centrifuge tests demonstrated a significant reduction in soil moduli around the piles during strong shaking and a corresponding reduction in pile stiffnesses. The time-dependent shear modulus distribution in soil around the pile is obtained as part of the output. This allows the time variation of dynamic impedances of pile foundationsduring shaking to be established and allows a realistic assessment of thesingle-valued stiffnesses and damping factors usually incorporated into commercial structural analysis programs for the seismic analysis of pile-supported structures. The analysis also demonstrates the importance of inertial interaction between foundation and structure.