Essays about: "concrete dams"

Showing result 21 - 25 of 40 essays containing the words concrete dams.

  1. 21. Finite element analysis of cracking of concrete arch dams due to seasonal temperature variation

    University essay from Lunds universitet/Byggnadsmekanik; Lunds universitet/Institutionen för byggvetenskaper

    Author : Fredrik Pettersson; Fredrik Hjalmarsson; [2017]
    Keywords : arch dam; hydro power; finite element method; abaqus; temperature variations; concrete; deformation; crack propagation; Technology and Engineering;

    Abstract : Flera dammkonstruktioner i Norden utsätts för stora temperaturvariationer mellan sommar och vinter. I norra Sverige kan dammar vara utsatta för temperaturvariationer på upp emot 60–70 °C. Detta resulterar ofta i sprickbildning i betongen vilket medför utmaningar vid både utformning av nya dammar och underhåll av befintliga. READ MORE

  3. 22. Crack propagation in concrete dams driven by internal water pressure

    University essay from KTH/Betongbyggnad

    Author : Maria Sohrabi; José Sanchez Loarte; [2017]
    Keywords : Concrete cracks; water pressure; concrete dams; crack propagation; finite element analysis; linear elastic fracture mechanics; instrumentation;

    Abstract : Concrete structures are in general expected to be subjected to cracking during its service life. This is the reason why concrete is reinforced, where the reinforcement is only activated after cracks occur. However, cracks may be a concern in large concrete structures, such as dams, since it may result in reduced service life. READ MORE

  4. 23. Spatial variation in uplift pressure and correlation with rock mass conditions under two buttress dams : A case study of Ramsele and Storfinnforsen dams

    University essay from KTH/Jord- och bergmekanik

    Author : Diego Alcalá Perales; [2016]
    Keywords : Concrete dams; buttress dam; uplift pressure; probabilistic distribution; joint aperture; RQD.;

    Abstract : Uplift water pressure is one of the dominating forces with signicant impact acting on a dam. It is usually measured with piezometers installed along the dam. However, the value of the pressure along the dam is often hard to measure due to the limited number of piezometers available (Bernstone et al., 2009). READ MORE

  5. 24. Investigation of the frost resistance in bacteria treated self-healing concrete

    University essay from Lunds universitet/Avdelningen för Byggnadsmaterial

    Author : Karin Persson; [2016]
    Keywords : Concrete; Hydraulic Structures; Hydro Power; Frost Resistance; Self- healing; Bacteria; Precipitation; Calcium Carbonate Betong; Vattenbyggnader; Vattenkraft; Frostbeständighet; Självläkn- ing; Bakterier; Utfällning; Kalciumkarbonat; Technology and Engineering;

    Abstract : Vattenkraften står för hälften av vårt elbehov i Sverige idag. Merparten av vattenkraftverken är gjutna i betong och som många andra betongkonstruktioner så drabbas betongen av sprickbildning av olika orsaker. För vattenkraften är genomgående sprickor ett problem då dessa skapar läckage. READ MORE

  6. 25. Numerical analyses of concrete buttress dams to design dam monitoring

    University essay from KTH/Betongbyggnad

    Author : Daniel Svensen; [2016]
    Keywords : Concrete; buttress dams; thermal effects; finite element analysis; instrumentation; alarm values; alert values; Betong; lamelldammar; termiska effekter; finit element analys; intstrumentering; larmvärden;

    Abstract : Old concrete buttress dams are sensitive to cracking if exposed to large temperature variations. The cracks can make dams sensitive to failure, depending on the size and location of the cracks. These problems can be overcome by lowering the temperature variations and stabilizing the dams. READ MORE