Dimensionering av betongbeläggning för flygfält
Sammanfattning: There is at present a lack of guidelines for the design of concrete pavements for airfields and thus a need to prepare these. The purpose of this study is to describe the Swedish design principles for the design of both unreinforced concrete slabs joined with dowels and continuously reinforced concrete slabs for use in pavements for airfields and to develop design templates for these types of pavements. This report will also serve as a guideline in design and also provide suggestions on the dimensions of unreinforced concrete slabs joined with dowels and continuously reinforced concrete slabs and the underlying soil layers. This thesis deals with the design of unreinforced concrete slabs joined with dowels and continuously reinforced concrete slabs as pavements for airfields designed for airplanes of the largest class of airplane, code F. The complete pavement is from top to bottom: concrete slabs, bound base of asphalt bound gravel, unbound base and subbase on terraced subgrade. In the report, the main focus is the examination of the exhaustion of the concrete, the bound base and subbase. That is to say how many times airplanes can run over these pavements before failure occurs. Exhaustion is dependent on temperature tensions caused by the seasonal varying temperature gradient through the concrete and tension caused by traffic loads. For the bound base and subbase strain of the materials because of the tensions are checked. Actual design of pavements is done in the form of a case study of the design of concrete pavements for airfields for a reference project. The design is based on the Swedish method for the design of concrete roads with established literature. Stresses and strains due to traffic loads are calculated using FEM program PLAXIS. The design assumes that the unreinforced concrete slabs joined with dowels will be completely uncracked. These will therefore have to be significantly thicker than the reinforced plates. The reinforced pavements need to meet certain requirements. These pavements will have to be able to handle the moment load, have a required maximum distance between cracks and minimum reinforcement requirements. The report is arranged in such a way that the readers themselves easily will be able to establish and develop templates for fatigue calculation with the use of suitable software. No matter in which way the template is designed the intention will be to automate the use of the formulas that are mentioned and numbered in the report.
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