Sökning: "brottgränstillstånd."

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet brottgränstillstånd..

1. 1. Capacity assessment of arch bridges with backfill : Case of the old Årsta railway bridge

   Författare :Andreas Andersson; Håkan Sundquist; Raid Karoumi; Clive Melbourne; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Concrete arch bridge; soil backfill; spandrel walls; field measurements; finite element method; load distribution; ultimate limit state.; Betongbågbro; jordfyllning; sidomur; fältmätningar; finita element metoder; lastspridning; brottgränstillstånd.; Civil engineering and architecture; Samhällsbyggnadsteknik och arkitektur;

   Sammanfattning : The work presented in this thesis comprises the assessment of existing arch bridges with overlying backfill. The main objective is to estimate the load carrying capacity in ultimate limit state analysis. A case study of the old Årsta railway bridge is presented, serving as both the initiation and a direct application of the present research. LÄS MER

3. 2. Toward a reliability framework for the observational method

   Författare :Johan Spross; Stefan Larsson; Fredrik Johansson; Rasmus Müller; John Harrison; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rock engineering; observational method; Eurocode 7; structural safety; reliability analysis; dam safety; Bergmekanik; observationsmetoden; Eurokod 7; sannolikhetsbaserad dimensionering; dammsäkerhet; Byggvetenskap; Civil and Architectural Engineering;

   Sammanfattning : Constructing sustainable structures in rock that satisfy all predefined technical specifications requires rational and effective construction methods. When the geotechnical behaviour is hard to predict, the Euro­pean design code, Eurocode 7, suggests application of the observational method to verify that the performance is acceptable. LÄS MER

4. 3. Between square and circle : A study on the behaviour of polygonal steel profiles under compression

   Författare :Panagiotis Manoleas; Ove Lagerqvist; Efthymios Koltsakis; Leroy Gardner; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polygonal; RCPS; plate buckling; shell buckling; towers; transmission lines; wind turbines; high strength steel; Stålbyggnad; Steel Structures;

   Sammanfattning : The present study explores the structural properties of regular convex polygonal cross section (RCPS). Such profiles are commonly used to construct masts and towers, e.g.  transmission towers, light poles etc. LÄS MER

5. 4. Assessment of existing concrete bridges : bending stiffness as a performance indicator

   Författare :Markus Bergström; Paulo J. de S. Cruz; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Structural Engineering; Konstruktionsteknik;

   Sammanfattning : Optimizing the use of existing civil reinforced concrete (RC) structures could be interpreted in such a way as to say that the capacity should be used and taken care of in an effective manner, both from a technical and economical point of view, keeping the safety in mind. Achieving this requires thorough understanding of the structure and also of the tools used for assessing current and future capacity and needs. LÄS MER

7. 5. Patch loading resistance of plated girders : ultimate and serviceability limit state

   Författare :Jonas Gozzi; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel Structures; Stålbyggnad;

   Sammanfattning : Patch loading or partial edge loading of steel girder webs is a load case where a concentrated force is introduced perpendicular to the flange of a girder. This usually induces a local failure of the girder web in the vicinity of the loaded flange. LÄS MER