Dynamic analyses for fatigue assessment of existing steel bridges
2014 (English)Conference paper (Refereed)
In fatigue assessments of existing bridges, the influence of dynamics is conventionally considered by a dynamic amplification factor on the static response. This quasi-static approach gives a multiplicative enlargement of the stress ranges but doesn't necessarily represent the actual dynamic response. Moving loads on a bridge usually gives a more complicated time response than the corresponding static load. Redistribution of the stress range spectrum is expected dependent on the train speed and the dynamic properties of the bridge. Typical bridge beams found in open deck steel bridges are studied using two analytical methods for analysis. The methods are based on the Euler-Bernoulli beam theory and the Timoshenko beam theory, respectively. Using both methods enable a study on the influence of shear deformation and rotational inertia. The study also comprises the discrepancies in dynamic response of simply supported beams and continuous beams. The numerical results support the use of the quasi static approach for one span beams. For continuous beams on the other hand, the quasi static approach does not correctly reflect the dynamic behavior.
Place, publisher, year, edition, pages
BOCA RATON: CRC PRESS-TAYLOR & FRANCIS GROUP , 2014. 2373-2381 p.
, BRIDGE MAINTENANCE, SAFETY, MANAGEMENT AND LIFE EXTENSION
IdentifiersURN: urn:nbn:se:kth:diva-153290ISI: 000341306400330ScopusID: 2-s2.0-84906675717ISBN: 978-1-315-76069-8ISBN: 978-1-138-00103-9OAI: oai:DiVA.org:kth-153290DiVA: diva2:752417
7th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2014; Shanghai; China; 7 July 2014 through 11 July 2014
QC 201410032014-10-032014-10-032014-10-03Bibliographically approved