ABSTRACT
ABSTRACT A number of UK long span suspension bridges now require routine inspection, assessment and maintenance to ensure their continued durability. The UK Design Manual for Roads and Bridges (DMRB) has explicit guidance on the traffic loading for assessment lengths up to 50m, however beyond this the assumptions become conservative. In these instances, the assessment of these structures requires a Bridge Specific Assessment Live Load (BSALL) to be derived. Although a number of methodologies exist to derive BSALLs, there are several parameters that may significantly affect their results and there is little published guidance on the subject.
Through recent work covering the calculation of suspension bridges, Atkins have completed many parametric studies, considering different distribution methods and the relative importance of the various parameters involved. This paper discusses the above themes and outlines the advancements made by Atkins in this field, highlighting the critical parameters to consider, the advantages and limitations of the various approaches, and a recommended approach based on our findings to date.
