Sökning: "prestressed concrete"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden prestressed concrete.

1. 1. Concrete Bridges : Improved Load Capacity

   Författare :Jonny Nilimaa; Terje Kanstad; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Structural Engineering; Konstruktionsteknik;

   Sammanfattning : There are many beautiful old structures around the world, some of which were designed for completely different purposes than their current applications. For example, Swedish railway bridges were only designed to carry axle loads up to 200 kN in the beginning of the 20th century, while modern loads can be twice as high. LÄS MER

3. 2. Using prestressed steel fiber reinforced high performance concrete in the industrilization of bridge structures

   Författare :Lutfi Ay; KTH; []
   Nyckelord :Prestressed concrete; Casting steel fiber reinforced concrete; Bridges Casting steel fiber reinforced concrete; Bridges;

   Sammanfattning : .... LÄS MER

4. 3. Steel fibrous cement based composites: material and mechanical properties : behavior in the anchorage zones of prestressed bridges

   Författare :Lutfi Ay; KTH; []
   Nyckelord :process improvement of bridges; prestressed concrete; high performance concrete;

   Sammanfattning : This PhD thesis is divided into two parts. Part one dealswith the development of the material and the mechanicalproperties of Steel Fibrous Cement Based Composites (SFCBC) forimproving bridge design and construction. It familiarizes thehydration mechanisms of the high performance concrete with thehelp of Powers´ and Jensen´s models. LÄS MER

5. 4. Structural Behaviour of Concrete Railway Sleepers

   Författare :Rikard Gustavson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; concrete; finite element analysis; three-wire strand; sleeper; bond; strand; pull-through tests; steel encased; push-in tests; bond mechanism; numerical bond model; dynamic loads;

   Sammanfattning : The railway concrete sleeper is an important part of the railway track structure. The sleeper member requires substantial engineering skills during the design and manufacturing process in order to fulfil the requirements set by modern train traffic. LÄS MER

7. 5. Shear and Torsion in Concrete Structures Non-linear Finte Element Analysis in Design and Assessment

   Författare :Helén Broo; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; torsion; box-girder bridge; hollow core unit; hollow core floor; non-linear finite element analysis.; shear; prestressed concrete; Reinforced concrete;

   Sammanfattning : For structural design and assessment of reinforced concrete members, non-linear finite element analysis has become an important tool. However, design and assessment of shear and torsion are still done with simplified analytical or empirical design methods. LÄS MER