Details
| Original language | English |
|---|---|
| Pages (from-to) | 396-406 |
| Number of pages | 11 |
| Journal | Engineering Structures |
| Volume | 174 |
| Early online date | 30 Jul 2018 |
| Publication status | Published - 1 Nov 2018 |
Abstract
This contribution deals with the dynamic behaviour of railway bridges for high-speed traffic and investigates the impact of changes to the structural system on the dynamic response due to crossing trains. Multi-span simply supported beams represent the most unfavourable system for high-speed trains, structurally as well as aesthetically. Therefore, alternative structural systems were analysed to find out whether the dynamic characteristics of railway bridges can be adjusted in the design stage. Because of the strong interaction between the crossing train and the bridge structure the impact of changes to the structure is very difficult to estimate a priori. The internal forces in continuous beams with lengths exceeding 30 m are generally smaller than those in single-span beams with the same cross section and the speeds at which they can be crossed are significantly higher. By adding haunches to the beams those eigenfrequencies whose eigenmodes exhibit curvatures at the supports can be increased. Shortening the end spans leads to an increase in all eigenfrequencies and hence in resonance speeds. Using the findings from this article the dynamic stability of high-speed railway bridges can be improved at the preliminary design stage.
Keywords
- Continuous beams, Design, Dynamic increase, Dynamics, High-speed traffic, Railway bridges, Resonance
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
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In: Engineering Structures, Vol. 174, 01.11.2018, p. 396-406.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Design of railway bridges for dynamic loads due to high-speed traffic
AU - Schneider, Sebastian
AU - Marx, Steffen
N1 - Publisher Copyright: © 2018 Elsevier Ltd Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/11/1
Y1 - 2018/11/1
N2 - This contribution deals with the dynamic behaviour of railway bridges for high-speed traffic and investigates the impact of changes to the structural system on the dynamic response due to crossing trains. Multi-span simply supported beams represent the most unfavourable system for high-speed trains, structurally as well as aesthetically. Therefore, alternative structural systems were analysed to find out whether the dynamic characteristics of railway bridges can be adjusted in the design stage. Because of the strong interaction between the crossing train and the bridge structure the impact of changes to the structure is very difficult to estimate a priori. The internal forces in continuous beams with lengths exceeding 30 m are generally smaller than those in single-span beams with the same cross section and the speeds at which they can be crossed are significantly higher. By adding haunches to the beams those eigenfrequencies whose eigenmodes exhibit curvatures at the supports can be increased. Shortening the end spans leads to an increase in all eigenfrequencies and hence in resonance speeds. Using the findings from this article the dynamic stability of high-speed railway bridges can be improved at the preliminary design stage.
AB - This contribution deals with the dynamic behaviour of railway bridges for high-speed traffic and investigates the impact of changes to the structural system on the dynamic response due to crossing trains. Multi-span simply supported beams represent the most unfavourable system for high-speed trains, structurally as well as aesthetically. Therefore, alternative structural systems were analysed to find out whether the dynamic characteristics of railway bridges can be adjusted in the design stage. Because of the strong interaction between the crossing train and the bridge structure the impact of changes to the structure is very difficult to estimate a priori. The internal forces in continuous beams with lengths exceeding 30 m are generally smaller than those in single-span beams with the same cross section and the speeds at which they can be crossed are significantly higher. By adding haunches to the beams those eigenfrequencies whose eigenmodes exhibit curvatures at the supports can be increased. Shortening the end spans leads to an increase in all eigenfrequencies and hence in resonance speeds. Using the findings from this article the dynamic stability of high-speed railway bridges can be improved at the preliminary design stage.
KW - Continuous beams
KW - Design
KW - Dynamic increase
KW - Dynamics
KW - High-speed traffic
KW - Railway bridges
KW - Resonance
UR - http://www.scopus.com/inward/record.url?scp=85050726825&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2018.07.030
DO - 10.1016/j.engstruct.2018.07.030
M3 - Article
VL - 174
SP - 396
EP - 406
JO - Engineering Structures
JF - Engineering Structures
SN - 0141-0296
ER -