The dynamic interaction between the soil and the structure resting on it during
earthquakes can alter the response characteristics both of the structure and the soil.
Despite significant efforts over the past decades, the interaction effect is not yet
fully understood and is sometimes misunderstood. In the context of performance
based design, there remain a number of uncertainties to be addressed seriously.
Current practice of seismic soil-structure response analysis has tended to focus on
the effect of horizontal motion although actual ground motions are comprised of
both horizontal and vertical components. In several recent earthquakes, very
strong vertical ground motions have been recorded, raising great concern over the
potential effect of vertical motion on engineering structures. To address this
emerging problem, seismic response considering the soil-structure interaction
effect to both vertical and horizontal earthquake motions needs to be investigated.
This thesis presents a simple and practical framework for the analysis of site
response and soil-structure interaction to both horizontal and vertical earthquake
motions, which can take into account the soil nonlinearity and material damping
effect. The analysis procedure involves the use of the dynamic stiffness matrix
method and equivalent-linear approach and is built in the modern MATLAB
environment to take the full advantages of the matrix operations in MATLAB.
The input motions can be specified at the soil–bedrock interface or a rock
outcropping. A detailed assessment of the procedure is provided to illustrate that
the procedure is able to produce acceptable predictions of both vertical and
horizontal response of soil-structure systems. It is shown that soil nonlinearity
plays an important role in altering the response of the structure and soil, and the
methods of analysis for soil-structure interaction adopted in current engineering
practice may not be able to adequately account for soil nonlinearity. Furthermore,
effects of a number of influencing factors, such as material damping ratio,
Poisson’s ratio of soil, intensity and location of input motion and the embedment
ratio of the foundation are examined, leading to several useful implications for
seismic engineering practice. / published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
| Identifer | oai:union.ndltd.org:HKU/oai:hub.hku.hk:10722/188239 |
| Date | January 2012 |
| Creators | Yan, Xiaorong., 閆晓荣. |
| Publisher | The University of Hong Kong (Pokfulam, Hong Kong) |
| Source Sets | Hong Kong University Theses |
| Language | English |
| Detected Language | English |
| Type | PG_Thesis |
| Source | http://hub.hku.hk/bib/B48199217 |
| Rights | The author retains all proprietary rights, (such as patent rights) and the right to use in future works., Creative Commons: Attribution 3.0 Hong Kong License |
| Relation | HKU Theses Online (HKUTO) |
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