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Wind Tunnel Testing of Bridge Decks

Horg, Svend Erik; Aas, Sigurd Berg
Master thesis
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http://hdl.handle.net/11250/2407302
Utgivelsesdato
2016
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  • Institutt for konstruksjonsteknikk [1596]
Sammendrag
The studies done in this thesis was connected to an early stage implementation of

a new test method for ?nding aerodynamic properties of bridge deck sections at the

Norwegian University of Science and Technology (NTNU), Department of Structural

Engineering. This method is based on wind tunnel measurements of cross sections

using a forced vibration principle where the bridge motion is forced by a custom

made test rig. The rig performing the forced vibration tests is the ?rst of its kind

at NTNU, and can produce motion in three degrees of freedom (horizontal, vertical

and rotational), both separately and simultaneously. The forced vibration method is

gaining popularity as it introduces a variety of possibilities in terms of aerodynamic

testing.

The main goal of these studies was to develop a process of building bridge section

models compatible with the forced vibration test rig and suited for early stage testing

of cross section design. Furthermore, it was an objective to do wind tunnel testing

of the crafted section models, and to analyze the output from the testing in terms of

data quality and aerodynamic properties.

The objectives were pursued in a four stage process. Theory studies and a series of

calculations and material tests led to the design of two bridge sections strong and sti?

enough to withstand the wind tunnel loading. The building process was performed

at the department lab where all the design solutions were implemented. A series of

forced vibration test were performed in the wind tunnel at NTNU, Department of

Energy and Process Engineering (EPT), and the outputs from the tests were post

processed and analyzed.

The work done resulted in a procedure of building models using the equipment

available at the department and the materials found suitable. This includes a com-

prehensive study of the individual material properties as well as the properties of

the model as a whole. The possible designs of choice were thoroughly assessed, and

this led to a choice of two section model concepts. A rectangular shaped section

served as a reference model which was easy to build, while a Twin section became

the main model of interest in this thesis. Aerodynamic properties of the models were

extracted from data obtained by wind tunnel testing, and a quality assessment con-

cerning the performance of the model was completed. Further, a comparing study of

the results from the Twin section was performed with a similar bridge concept called

Brusymfonien.

The section models developed in this thesis were found compatible with the forced

vibration rig for the purpose of extracting aerodynamic properties. However, further

work is required to increase the accuracy and achieve more stable results. Most

important in this matter was shown to be the overall sti?ness of the models
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