Published April 20, 2023
| Version v1
Publication
Dynamic load allowance of long-span modular steel bridges
Contributors
Others:
- Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras
- Universidad de Sevilla. TEP245: Ingeniería de las Estructuras
- Spanish Ministry of Science and Innovation - research project PID2019-109622RB
- Junta de Andalucía, Spain and the European Social Fund with the Universidad de Sevilla and the Andalusian Scientific Computing Centre (CICA) contract USE-22311-R
Description
Modular steel bridges are structures whose construction is based on regular prefabricated truss units. This
presents several advantages, such as rapid and easy deployment, high adaptability to the terrain and reduced
construction costs. However, they generally face operational restrictions for span lengths greater than 60 m.
Recent technological innovations search to overcome these limitations and develop modular structures with
larger spans. Hence, the main objective of this work is to evaluate the dynamic effects on long-span modular
steel bridges. The present contribution provides a study on two modular bridge typologies, considering different
span lengths from 120 to 140 m. A 3D coupled vehicle–bridge model is used to analyse the vehicle–bridge
interaction and the dynamic load allowance of the structures. The vehicle is represented as a multibody truck
system and the bridges are modelled with the finite element method. Several types of randomly-generated
road irregularities are considered on the bridge deck. The effect of each type of irregularity is evaluated on the
dynamic load allowance of the bridges. The results obtained reveal the notable influence of road irregularities
that involve abrupt vertical displacements that excite the vehicle mode shapes. In addition, it is observed
that dynamic load allowance indices tend to decrease with longer spans and higher speeds, except when a
resonance is produced
Additional details
Identifiers
- URL
- https://idus.us.es/handle//11441/144685
- URN
- urn:oai:idus.us.es:11441/144685