Dynamic response of foundations resting on layered soil by cone model

✍ Scribed by P.K. Pradhan; D.K. Baidya; D.P. Ghosh

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 296 KB
• Volume: 24
• Category: Article
• ISSN: 0267-7261
• DOI: 10.1016/j.soildyn.2004.03.001

✦ Synopsis

Impedance functions for a rigid massless circular foundation resting on a soil layer underlain by a rigid base subjected to vertical harmonic excitation are found using one-dimensional wave propagation in cones. The static stiffness predicted by the model for different depths of layer agrees well with published results. The frequency -amplitude response of a foundation is then found using impedance functions. The predicted resonant frequency is compared with published results based on both analytical and experimental investigation, which shows a good engineering accuracy (deviation of ^12%) with a vast variation of parameters. The predicted frequency -amplitude response and resonant amplitudes are also compared with reported experimental results, which shows a good agreement. Also the influence of key parameters such as mass ratio, Poisson's ratio, depth of the layer and hysteretic material damping ratio on the vertical response of the foundation is investigated. The results are presented in the form of simple and versatile dimensionless graphs, which may prove to be useful in understanding the harmonic response of foundations resting on layered soil under vertical excitation.