Dynamic response of foundations

Sivapalan, E, 1981. Dynamic response of foundations. PhD, Nottingham Trent University.

Preview

Text 10290228.pdf - Published version Download (60MB) | Preview

Abstract

The thesis describes a field investigation into the dynamic response of shallow concrete foundation pads constructed on a natural soil deposit. Particular emphasis is placed upon the response of 'passive' foundations excited by vibrations transmitted through the soil from an adjacent 'active' foundation subjected to periodic excitation derived from a rotating mass type vibrator.

A test rig incorporating the vibrator and ancillary equipment for independent control of operating speed and amplitude of dynamic load was constructed. Instrumentation for the measurement of foundation and ground surface accelerations in the range 0.00000lg to 1g was assembled from commercially available units. A series of field tests involving two sets of active and passive foundation pads was conducted.

The transmission of vibrations through the soil from one foundation to another is examined by considering the ratio of the vertical displacement of 'the passive foundation to the corresponding displacement of the active foundation. It is shown that the transmission ratios are substantially independent of both the mass ratio of the active foundation and the intensity of excitation. The test results are used to demonstrate the influence of soil adhesion along the sides of a passive foundation on its dynamic response. Also, the influence of the passive foundation on the response of the active foundation, the nonlinear behaviour of the supporting soil and the interaction between two closely spaced passive foundations are illustrated.

To examine the practical application of existing theories, the results of published theoretical parametric studies are used to derive equations of motion of both the active and the passive foundations, and vertical displacements calculated using the measured in situ soil parameters are compared with the field results. The differences between predicted and measured responses are discussed. The problems which require further study are identified and listed as suggestions for further research.

Item Type:	Thesis
Creators:	Sivapalan, E.
Date:	1981
ISBN:	9781369324778
Identifiers:	Number Type PQ10290228 Other
Divisions:	Schools > School of Architecture, Design and the Built Environment
Record created by:	Linda Sullivan
Date Added:	24 Jun 2021 10:15
Last Modified:	18 Oct 2023 14:20
URI:	https://irep.ntu.ac.uk/id/eprint/43192

Actions (login required)

Edit View

Statistics

Views

Downloads