Sökning: "Superstructure"

Visar resultat 6 - 10 av 29 avhandlingar innehållade ordet Superstructure.

  1. 6. Open-Framework Germanates Crystallography, structures and cluster building units

    Detta är en avhandling från Stockholm : Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi

    Författare :Kirsten Elvira Christensen; Stockholms universitet.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; germanate; crystallography; building unit; zeotype; scale chemistry; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; strukturkemi; Structural Chemistry;

    Sammanfattning : This thesis is focussing on the crystallographic challenges and what knowledge we can gain from studying the different open-framework germanates. Five new open-framework germanates have been synthesized and the structures have been determined by single crystal X-ray diffraction. LÄS MER

  2. 7. Simplified dynamic analysis of railway bridges under high-speed trains

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Christoffer Johansson; KTH.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dynamic; Railway bridge; High-speed train; Moving load; Multi-span beam; Probabilistic;

    Sammanfattning : The world-wide development of new high-speed rail lines has led to more stringent design requirements for railway bridges. This is mainly due to the fact that a train at high speeds can cause resonance in the bridge superstructure. LÄS MER

  3. 8. Essential modelling details in dynamic FE-analyses of railway bridges

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Mahir Ülker-Kaustell; KTH.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Järnvägsgruppen - Infrastruktur; Järnvägsgruppen - Infrastruktur;

    Sammanfattning : The increased need to reduce the use of fossil fuels imposes higher demands on the efficiency of rail transportation. Therefore, an improved knowledge regarding the dynamic properties of railway bridges and infrastructure for railway traffic in general is required. LÄS MER

  4. 9. On the Modelling of Train Induced Ground Vibrations with Analytical Methods

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Anders Karlström; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ground vibrations; train; wave propagation; dynamic flexibility; trench; railway track; vibration isolation; wave barrier; soil-structure interaction;

    Sammanfattning : A novel analytical approach to model train induced ground vibrations is proposed. Integral transform solutions are combined with series solutions to obtain fast numericalalgorithms, where a particular designed boundary condition for finite regions is seen to enable the solution procedure. LÄS MER

  5. 10. Design of steel piles for integral abutment bridges

    Detta är en avhandling från Luleå tekniska universitet

    Författare :Hans Petursson; Luleå tekniska universitet.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; integral abutment bridges; steel piles; jointless bridges; Civil engineering and architecture - Building engineering; Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik; Steel Structures; Stålbyggnad;

    Sammanfattning : In 1999 research was started at Luleå University of Technology with the purpose to collect experiences from USA and UK on bridges with integral abutments and transfer the experience to Swedish conditions. Since then at least 20 integral bridges with one row of piles under each abutment have been built in Sweden and the European research project INTAB has been completed. LÄS MER