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Visar resultat 1 - 5 av 47 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Behaviour of fracture process zones in concrete influenced by simultaneously applied normal and shear displacements

    Författare :Manouchehr Hassanzadeh; Avdelningen för Byggnadsmaterial; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; softening; mixed mode; fictitious crack model; concrete; deformationer; betong; brottmekanik; hållfasthet; brotthållfasthet; spänningar; skjuvspänningar; sprickor; beräkningsmodeller; brottenergi; teori; laboratorieförsök; interlock; crack path; diagonal crack; microcracking; instability; fracture energy; fracture mechanics; shear; tension; process zone;

    Sammanfattning : The thesis deals with the determination of the post peak behaviour of concrete in pure tension, and combined tension (compression) and shear. A test arrangement has been developed in order to determine the post peak behaviour of concrete expressed as stress - displacement curves. LÄS MER

  3. 2. Modelling of Transport Processes Involved in Service Life Prediction of Concrete : Important Principles

    Författare :Björn Johannesson; Göran Fagerlund; Avdelningen för Byggnadsmaterial; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; teori; beräkningsmodeller; finita element; beständighet; betong; livslängd; nedbrytning; sprickor; deformationer; hållfasthet; korrosion; klorider; fukt; simulering; luftporer; adsorption; beräkningsmetoder; desorption; Byggteknik; Civil engineering; teori; beräkningsmodeller; finita element; beständighet; betong; livslängd; nedbrytning; sprickor; deformationer; hållfasthet; korrosion; klorider; fukt; simulering; luftporer; adsorption; beräkningsmetoder; desorption;

    Sammanfattning : The main focus in this licentiate thesis is a description of the environmentally introduced action of diffusing and chemically reactive (e.g. carbonation and chemical-physical adsorption-desorption) matter in the pore solution and in the air-filled space in the pore system of the material. LÄS MER

  4. 3. Frysning av jord och berg vid tunnelbyggande. Studier av deformationer och spänningar

    Författare :Teddy Johansson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Building engineering; Byggnadsteknik;

    Sammanfattning : .... LÄS MER

  5. 4. Influence of aggregates on permanent deformation of asphalt

    Författare :Bernardita Francisca Lira Miranda; Robert Lundström; Stefan Larsson; Alan Carter; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Asphalt; deformation; rutting; gradation; flakiness index; Asfalt; kornstorleksfördelning; flisighetsindex; permanent deformation; spårbildning.; Jord- och bergmekanik; Soil and Rock Mechanics;

    Sammanfattning : One of the most common failure modes for asphalt pavements is the occurrence of permanent deformation on the wheel path. This leads to not only other distresses, such as potholes and stripping, but also decreases substantially road safety and increases maintenance costs. LÄS MER

  7. 5. Stiffness of reverse channel connections at room and elevated temperatures

    Författare :Tim Heistermann; Darko Beg; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel Structures; Stålbyggnad;

    Sammanfattning : A frame structure exposed to fire undergoes two types of changes due to the resulting temperature fields. The first is the thermal expansion of the structural members and the second is the degradation of the material strength and stiffness as temperature rises. LÄS MER