Dynamic load allowance of long-span modular steel bridges

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 reduced costs. However, they generally face operational restrictions for span lengths greater than 60m. Recent technological innovations search overcome these limitations develop modular with larger spans. Hence, main objective of this work evaluate dynamic effects long-span bridges. The present contribution provides a study two bridge typologies, considering different from 120 140m. A 3D coupled vehicle–bridge model used analyse interaction load allowance structures. vehicle represented multibody truck system modelled finite element method. Several types randomly-generated road irregularities considered deck. effect each type irregularity evaluated results obtained reveal notable influence that involve abrupt vertical displacements excite mode shapes. In addition, it observed indices tend decrease longer spans higher speeds, except when resonance produced.