Sökning: "lamelldammar"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet lamelldammar.

1. 1. Safety Assessment of Cracked Buttress Dams

   Master-uppsats, KTH/Betongbyggnad

   Författare :Robel Tekeste Fekadu; Sujata Kayastha; [2020]
   Nyckelord :Concrete buttress dam; finite element analysis; safety factor; global failure; reinforcement; corrosion; combined failure; traditional stability analysis;

   Sammanfattning : Most of the concrete buttress dams in Sweden were built from the 1950s till the1980s based on the traditional method of analyses. Those structures are reinforced and heavy in structure. Their height to thickness ratio being large makes them prone to crack during their lifespan. LÄS MER

3. 2. An alarm system for pore pressure measurements in the foundation ofconcrete dams : a case study of Storfinnforsen buttress dam

   Master-uppsats, KTH/Jord- och bergmekanik

   Författare :Daniel Falcão de Queiroz; [2018]
   Nyckelord :Buttress dams; dam foundation; pore pressure; alarm system; alarm limits; sliding in the rock mass; uplift pressure; piezometers.; Lamelldammar; dammgrundläggning; portryck; alarm system; alarmgränser; glidning i bergmassan; upptryck; portrycksmätare;

   Sammanfattning : Concrete buttress dams are relatively light structures and less demandingon foundations; because of that, they may have problems with upliftforces and horizontal joints in the area of the dam´s foundation maypresent a failure mode through sliding. The Storfinnforsen dam, thelargest concrete dam in Sweden, had its foundation studied recently andthe discovery of sub-horizontal joints in the bedrock led to the necessityof having the safety of the dam foundation to sliding assessed. LÄS MER

4. 3. Numerical analyses of concrete buttress dams to design dam monitoring

   Master-uppsats, KTH/Betongbyggnad

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

   Sammanfattning : 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. LÄS MER

5. 4. Partialkoefficienter för stabilitetsanalys av betongdammar

   Master-uppsats, KTH/Jord- och bergmekanik

   Författare :Alexander Wängberg; [2015]
   Nyckelord :concrete dams; buttress dams; gravity dams; stability analysis; sliding stability; dam safety; partial factors; betongdammar; massivdammar; lamelldammar; dammsäkerhet; partialkoefficienter; stabilitetsanalys; glidningsstabilitet;

   Sammanfattning : I Sverige finns det idag ett stort antal dammar och nära hälften av Sveriges elproduktion kommer ifrån vattenkraft. Höga säkerhetskrav ställs på dammarna då konsekvenserna av ett dammbrott kan orsaka stor ekonomisk skada både i form av minskad produktion och som uppbyggnadskostnader. LÄS MER

7. 5. Progressive failure analyses of concrete buttress dams : Influence of crack propagation on the structural dam safety

   Master-uppsats, KTH/Betongbyggnad

   Författare :Chaoran Fu; Bjartmar Hafliðason; [2015]
   Nyckelord :concrete buttress dams; cracked concrete; failure modes; safety factor; finite element analysis; nonlinear material properties; betong; lamelldammar; uppsprucken betong; brottmoder; säkerhetsfaktor; finita element analyser; icke-linjära material modeller;

   Sammanfattning : Concrete buttress dams are the most common type of concrete dams for hydropower production in Sweden. Cracks have been observed in some of the them. However, only limited research has been made concerning the influence of these cracks on the structural dam safety. LÄS MER