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Numerical evaluation of the mid-span assumption in the calculation of total load effects in railway bridges
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering. Roughan and O'Donovan Innovative Solutions, Ireland.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0002-5447-2068
2016 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 107, 1-8 p.Article in journal (Refereed) PublishedText
Abstract [en]

Maximum load effects in simply supported railway bridges traversed by trains are generally investigated at the mid-span section. However, this assumption is not necessarily correct. The true maximum load effect might occur at some other bridge section and its magnitude could be significantly greater. This paper quantifies the underestimation of the load effects as a result of exclusively considering the middle section, with special emphasis on resonant situations. A 2D numerical model of a vehicle-track-bridge system was used to evaluate different vehicle velocities, bridge properties and track irregularity conditions. The error due to the mid-span assumption depends on the particular case considered but can be related to the relative energy content of the higher modes of vibration. The results show that the error is greatest for accelerations, smaller for bending moments and is almost negligible for displacements.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 107, 1-8 p.
Keyword [en]
Bridge, Dynamic, Railway, Resonance, Mid-span, Acceleration
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-180477DOI: 10.1016/j.engstruct.2015.11.005ISI: 000366775600001ScopusID: 2-s2.0-84946866203OAI: diva2:894538

QC 20160115

Available from: 2016-01-15 Created: 2016-01-14 Last updated: 2016-01-15Bibliographically approved

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