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Fracture mechanics analysis of concrete structures
This thesis presents results from numerical and analytical analyses of concrete structures as well as results from laboratory tests. Numerical methods based on the finite element method and fracture mechanics are used. The thesis comprises five papers and a general introductory part. The five papers deal with the following topics: Material properties for concrete at low temperatures, Paper A: This paper presents results from an investigation of the fatigue strength and the fracture energy of water saturated unreinforced concrete. The tests were carried out both at room temperature and under cold conditions. The experiments show that the load bearing capacity of water saturated specimens is strongly affected of low temperatures. The water in the pores freezes and generates a load bearing ice skeleton. The compressive and splitting strength of the concrete will as a result increase. Also the fracture energy increases at low temperatures. Both the absolute and the relative fatigue strength increase for water saturated concrete. Bond properties of concrete, Paper B: The paper discusses the influence of splitting failure on the bond properties of deformed reinforcement bars. Laboratory tests with normal and high strength concrete are presented. The tests were designed to obtain a high degree of confinement with the intention to establish the upper limit of the bond strength. The bond strength has been normalized with regard to the concrete splitting strength. The high strength concrete has a higher normalized bond strength than the normal strength concrete for bar diameters of 8 and 16 mm. A theoretical model, based on fracture mechanics, is presented. The model gives relationships between the pressure generated by the mechanical interaction and the length of the splitting cracks. Modelling of concrete shaft in a gravity based offshore structure. Influence of hydraulic pressure on fracture mechanics parameters, Paper C: The paper describes an analysis carried out in order to predict the risk of concrete delamination ...
Fracture mechanics analysis of concrete structures
This thesis presents results from numerical and analytical analyses of concrete structures as well as results from laboratory tests. Numerical methods based on the finite element method and fracture mechanics are used. The thesis comprises five papers and a general introductory part. The five papers deal with the following topics: Material properties for concrete at low temperatures, Paper A: This paper presents results from an investigation of the fatigue strength and the fracture energy of water saturated unreinforced concrete. The tests were carried out both at room temperature and under cold conditions. The experiments show that the load bearing capacity of water saturated specimens is strongly affected of low temperatures. The water in the pores freezes and generates a load bearing ice skeleton. The compressive and splitting strength of the concrete will as a result increase. Also the fracture energy increases at low temperatures. Both the absolute and the relative fatigue strength increase for water saturated concrete. Bond properties of concrete, Paper B: The paper discusses the influence of splitting failure on the bond properties of deformed reinforcement bars. Laboratory tests with normal and high strength concrete are presented. The tests were designed to obtain a high degree of confinement with the intention to establish the upper limit of the bond strength. The bond strength has been normalized with regard to the concrete splitting strength. The high strength concrete has a higher normalized bond strength than the normal strength concrete for bar diameters of 8 and 16 mm. A theoretical model, based on fracture mechanics, is presented. The model gives relationships between the pressure generated by the mechanical interaction and the length of the splitting cracks. Modelling of concrete shaft in a gravity based offshore structure. Influence of hydraulic pressure on fracture mechanics parameters, Paper C: The paper describes an analysis carried out in order to predict the risk of concrete delamination ...
Fracture mechanics analysis of concrete structures
Ohlsson, Ulf (author)
1995-01-01
179
Theses
Electronic Resource
English
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