dc.contributor.advisor |
John W. Butterworth |
en |
dc.contributor.author |
Ma, Quincy Tsun Ming |
en |
dc.date.accessioned |
2010-07-19T03:35:23Z |
en |
dc.date.available |
2010-07-19T03:35:23Z |
en |
dc.date.issued |
2010 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/5861 |
en |
dc.description.abstract |
This thesis describes an investigation into the dynamic response of structures
that are permitted to rock or uplift when subjected to ground excitations. Previous
studies have demonstrated that rocking motion can mitigate undesirable seismic
actions on structures, and this has been further confirmed through extensive numerical
time integration analyses in the present study.
Despite the intuitive nature of rocking motion, it has been shown that the
underlying process is in fact highly complex, sensitive to initial conditions,
consequently history dependent and by no means well understood. The present work
aims to contribute to the current understanding of the fundamental mechanics of
rocking systems. With the aid of experimental data, the dynamic response of free
rocking rigid blocks, controlled rocking systems and simple rocking structures was
closely examined. It was found that Housner’s simple rocking model remains the most
theoretically consistent and is the simplest model to implement. The result is also
generally satisfactory for modelling rigid rocking blocks, apart from the model's
inability to correctly predict energy dissipation at impacts.
The migration of the rotation centre during rocking was identified as central to
understand the dynamic characteristics of a controlled rocking system (an elastically
restrained rocking system). A novel approach was proposed to describe the rotation
centre’s migration behaviour. Then by considering the energy content of the system,
the pseudo-static force-displacement behaviour of a controlled rocking wall was able
to be accurately predicted. This was then successfully extended to predict the timehistory
response of controlled rocking systems.
Finally, new formulations were developed for predicting the time-history
response of three idealised rocking structural systems from first principles. These
were validated against published shake table tests results. Two of the highlights
arising from these formulations were 1) a set of simplified, closed form formulae
which precisely predicted the nonlinear static force-displacement relationship of a
rigid rocking structure on flexible ground, and 2) the governing differential equations
for a flexible structure rocking on rigid ground. This latter outcome provided users
with a valuable quantitative tool for assessing the benefit of implementing a rocking
isolation solution. |
en |
dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
PhD Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA2037461 |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
en |
dc.title |
The mechanics of rocking structures subjected to ground motion |
en |
dc.type |
Thesis |
en |
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Doctoral |
en |
thesis.degree.name |
PhD |
en |
dc.date.updated |
2010-07-19T03:35:23Z |
en |
dc.rights.holder |
Copyright: The author |
en |
dc.identifier.wikidata |
Q112883871 |
|