The effect of modeling lateral stiffness of pile foundations on numerical analyses of structural frames

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Journal Title
Journal ISSN
Volume Title
Insinööritieteiden korkeakoulu | Master's thesis
Date
2018-09-24
Department
Major/Subject
Mcode
ENG27
Degree programme
Master's Programme in Building Technology (CIV)
Language
en
Pages
72+13
Series
Abstract
Nowadays in Finland, there is an increasing interest in relying on the lateral resistance of pile foundation with less usage of raking piles. However, there is a current lack of understanding of soil-structure interaction and the cooperation between structural and geotechnical engineers is ineffective, which makes it difficult to fully rely on the current results. Therefore, this study was carried out to assess the effects of modeling lateral stiffness of pile foundation on structural stability analysis. Additionally, a general overview of soil-structure interaction and a suggestion of improved cooperation between the two engineering fields are provided in this work. The analysis was carried out on a building frame with four different lateral stiffness models on the foundation, the goal was to measure the response of the building frame to the models. The results show that the deformations of the building and foundation as well as the load distribution on the foundation and on the load bearing structure were sensible to the stiffness of the foundation. It has been concluded from the results that it is important to have a precise lateral stiffness model in order to have a more realistic load distribution on the load bearing structure, and that soil analysis should be carried out accordingly to the deformations obtained on the structural stability analysis. In order to achieve this goal, it is necessary to reinforce the cooperation between structural and geotechnical engineers in the exchange of information and the check of results throughout the design process. By doing this, both soil and structural analysis can be carried out with more precision and reliability of results can be increased.
Description
Supervisor
Puttonen, Jari
Thesis advisor
Uusitalo, Hannu
Valjus, Juha
Keywords
foundation, pile, structure, analysis
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Citation