Sökning: "BARS"

Visar resultat 1 - 5 av 141 avhandlingar innehållade ordet BARS.

1. 1. Bond and Anchorage of Ribbed Bars in High-Strength Concrete

   Författare :Jonas Magnusson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; non-linear finite element analysis; high-strength concrete; anchorage; ribbed bars; beam tests; bond; confinement; normal strength concrete; pull-out tests;

   Sammanfattning : For structural utilisation of high-strength concrete, a good understanding of the bond and anchorage behaviours of ribbed bars in this specific material is essential. The research project aims to increase the knowledge of bond and anchorage behaviours of ribbed bars in high-strength concrete. LÄS MER

3. 2. Experimental investigation of hydrocarbon formation and transformation under Earth´s upper mantle conditions

   Författare :Anton Kolesnikov; Vladimir Kutcherov; Bertil Sundqvist; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; theory of deep abiotic petroleum origin; natural gas; hydrocarbons; methane; ethane; graphite; hydrogen; high pressure; high temperature; CONAC; BARS; diamond anvil cell; Raman; X-ray; gas chromatography; Engineering mechanics; Teknisk mekanik;

   Sammanfattning : The theory of the abyssal abiotic petroleum origin considers oil and natural gas to begenerated in the Earth’s upper mantle. Hydrocarbons migrate further through the deep faults into the Earth’s crust, where they can form oil and gas deposits in any kind of rock in any kind of structural position. LÄS MER

4. 3. A theory of bond applied to overlapped tensile reinforcement splices for deformed bars

   Författare :Ralejs Tepfers; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Concrete; splitting failures; confinement; deformed bars; tensile overlap splices; bond theory; fatigue; concrete cover splitting; reinforcement;

   Sammanfattning : A bond theory for deformed reinforcing bars in concrete is elaborated taking into account different stages in development of final rupture occurring as splitting or pull-out. The concrete cover splitting resistance is modelled for a thick-walled concrete ring in elastic and plastic stages. Different final possible failure modes are analysed. LÄS MER

5. 4. Anchorage of naturally-corroded, plain bars in Reinforced Concrete structures

   Författare :Samanta Robuschi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bond; corrosion; concrete; anchorage; plain reinforcement bars;

   Sammanfattning : Reinforced Concrete (RC) is the most common construction material in existing structures. However, RC structures are susceptible to deterioration over time, with corrosion of the reinforcing steel as most common mechanism. Corrosion reduces strength and ductility provided by the reinforcement bars and affects their interaction with the concrete. LÄS MER

7. 5. Järn i jorden : Spadformiga ämnesjärn i Mellannorrland

   Författare :Marta Lindeberg; Torun Zachrisson; Terje Gansum; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Ämnesjärn; järn; järnålder; Norrland; depå; landskap; Archaeology subjects; Arkeologiämnen; Archaeology; North European; Arkeologi; nordeuropeisk; arkeologi; Archaeology;

   Sammanfattning : This thesis explores how the spade-shaped currency bars of central Norrland were used in different contexts and what significance they held. Spade-shaped currency bars give us a glimpse of a world-view different than our own where the intermediary form the bars represented bestowed upon them a much fuller significance than did their place in the production process. LÄS MER