Abstract
In 1992, Cambridge County Council commissioned the construction of an 8 m span brickwork arch at Kimbolton Butts, Cambridgeshire. This provided a unique opportunity to examine the short- and long-term stress and strain behaviour of a circular segmental arch bridge. This paper presents the results from a series of load tests carried out soon after construction. Axle loads of up to 30 t were applied at 1 m intervals along the length of the bridge while the vertical fill and fill-extrados boundary stresses were monitored. The interaction between the structure and the surrounding fill is analysed in terms of the measured stress in the fill. A finite-element analysis of the structure is also described and comparisons are made with the measured stresses. The analysis produced similar trends in terms of load spread and stress distribution. However, the actual stresses were generally higher than those predicted by the finite-element study because of the difference in flexibility in the soil-arch system. Stresses were also closely compatible to those predicted by the current Highways Agency Standard BD21/93. (A)
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