A professional bachelor project report from Aalborg University
Konstruktionsoptimering af ortotropisk stålbrodæk til Hirtshals Havn
[Optimization of orthotropic steel deck bridge for the port of Hirtshals]
Forfatter(e)
Semester
7. semester
Uddannelse
Udgivelsesår
2019
Afleveret
2019-01-18
Antal sider
52 pages
Abstract
The purpose of this project is to obtain knowledge about construction of ortotropical bridges. In this project a specific ramp in Hirtshals needs to be built, and thus two different designs will be compared. Both ramps measures 27 × 19 m, with a 5° bend in the last 5 m. The first design consist of two main girders in each side of the ramp, and three cross girders at the dock, bend and ending of the ramp. On the inside of the ramp trapezoidal ribs are placed to make the construction more rigid. The second design consists of the same frame, though a bit smaller. The main difference here is that inside the frame there will also be crossmembers with holes for smaller trapezoidal ribs. The simple ramp is controlled with classic analytical calculations with regards to the Eurocode, specifically 1 and 3. It is controlled against deflection, static failure and failure caused by fatigue. This ramp is also controlled by using the finite element method. The analysis is made using the software Inventor, and meshing will be done using 3D solid elements. The FEM analysis will be controlled against the same parameters as the analytical model was. The other ramp is only checked by using the FEM, due to the higher complexity of the construction. The same settings and control parameters as the simple ramp is used. It is then confirmed that both ramps will be safe, in terms of the required demands. To compare the two ramps the production is explained, and the different welding methods is accounted for. All the steel and welding material needed for the two ramps is summarized and compared, which reveal that the complex ramp uses slightly less material, but ultimately needs more welding work. Thus is it concluded that the complex ramp is deemed optimal, though more specifications of the welding work is needed to make the conclusion fully clear.
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