The UK's design documents for assessment of steel and composite highway bridges and structures have been updated in line with Highways England's overall plan for modernising the Design Manual for Roads and Bridges. This paper describes the key changes that have been made to the document and their impact on users, providing reassurance that, despite the new format, the methods and requirements are largely unchanged, or changed to facilitate future assessments by allowing more general approaches to be adopted. For steel bridges the key changes are described that affect robustness assessment, notch toughness, bearing stiffeners, cross-girders, stiffened panel buckling and inspection criteria for existing welds. For composite bridges, the changes relate mainly to the serviceability limit state verifications, to fatigue and to the shear connection, as well as the general improvements to remove outdated content and simplify the document. The changes for both documents include greater references to the Eurocodes in general, which will facilitate an easier transition to Eurocode assessment standards when these are published in the future.
Synopsis The Paper relates how difficulties in using the CBR test led to the trial of two other types of soil bearing test in an effort to reduce the time taken to determine the bearing capacity in situ of an area of soil. Preliminary trials showed one of these, the 3-in. plate failure load test, to possess potentially satisfactory performance. Further experiments showed that the relationship: log10 (CBR) = 0·76837 log10 (plate load in lb.) – 1·64422 exists. When applying this in field work it should be remembered that the 3-in. plate measures the CBR value at a different depth below the surface from the CBR plunger. Nous exposons ci-dessous comment des difficultés dans l'emploi de l'essai CBR nous a menés à l'épreuve de deux autres méthodes de déterminer la force portante du sol afin de réduire le temps nécessaire pour déterminer la force portante d'un périmètre de terrain in situ. Des essais préliminaires ont démontré que l'un d'entre ceux-ci, l'essai de charge de rupture sur un cercle de 3 pouces, a une fonction potentiellement satisfaisante. Les examens supplémentaires ont révéléque le rapport: log10 (CBR) = 0·76837 log10 (la charge sur le cercle en livres) – 1·64422 extste. Quant à l'application de ceci dans les travaux sur le terrain, il faut se rappeler que le cercle de 3 pouces mesure la valeur CBR à une profondeur différente à celle du plongeur CBR.
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