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Investigation of a Macro-Element Model for Shallow Foundations on Sand

Dypbukt, Helene
Master thesis
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URI
http://hdl.handle.net/11250/2614649
Date
2018
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  • Institutt for bygg- og miljøteknikk [2850]
Abstract
Larger and larger suspension bridges are being made. Therefore, tremendous forces

will be obtained in the suspension cable, which must be anchored. A good understanding

of the response of the foundation and its underlying soil during this kind

of loading will then be necessary. To calculate and understand the soil intersection

analyses is a time-consuming process, and reduction of the calculation time will be

beneficial.

The calculation time may be reduced by introducing a macro-element model. In this

model, the foundation and the underlying soil is represented in one single element,

known as a macro-element. The number of degrees of freedom will be reduced, and

good control of the structural response will be obtained. The macro-element model

simplifies the analyses by using only one single element to describe the global behavior,

which will reduce the calculation time.

In thisMaster thesis, a presentation of the macro-element model applied for shallow

foundations on sand is investigated. Some background theory is presented together

with the theory concerning the macro-element model. The mechanical behavior under

a foundation of sand during combined loading is investigated through both finite

element analyses and some prototype testing. The yield surface closer to vertical capacity

has been studied, and it look like the yield surface in V-H plane is valid here as

well. Overall, the finite element analysis matches the prototype tests.
Publisher
NTNU

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