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Dynamic modelling of railway bridges
2012 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Railway bridges are expensive to build and when damage occurs, it can cause serious problem in traffic due to repairing or in worst case total collapse of the bridge. Today most railway bridges are older, but the traffic on them is increasing both in numbers and tons. This sets high demands on service of the bridges and on numerical calculations to uphold the infrastructure. When damage occurs on a bridge, the load at the damaged area will increase and standard calculation methods can not be applied anymore. To fully estimate lifetime in a bridge due to the cyclic loading that occurs when a train passes over the bridge, advanced numerical methods can be used. To avoid wear and fatigue problem, regular inspections are necessary.In this work literature study, analysis and numerical modelling are used to study the dynamics of railway bridges. The interaction between the vehicle and the bridge is important and four different load models were created. These load models were used to load two different beam spans at three different velocities. By this, the basic theory of moving loads were verified showing that the velocity has a significant impact on the loading of the beam. Present method used by civil engineers follows the basic theory of moving loads. The numerical results shows that the more degrees of freedom the load models have the less the displacement will be. When analysing the dynamics of bridges the finite element method works for both simple cases e.i. constant moving force and more advanced cases e.i. more realistic load models and bridge models.

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-56216Local ID: cfe6d9e5-bc8f-4ea8-8533-ae5944c78f8fOAI: diva2:1029603
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20121219 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Jörgensson, Otto

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