the cold winter of 1978/1979 provided an opportunity for comparing effective bridge temperatures and temperature differences measured during these severe conditions with those predicted using methods developed at trrl. the month of january 1979 contained the lowest temperatures, and both the effective temperatures of the marlow-bisham bridge (concrete box) and the temperature differences measured through the depth of its deck during this month are presented in the report and compared with predictions. temperatures were also measured in the three elevated concrete slabs and two steel plates situated within the trrl grounds. the levels of temperature reached during january 1979 are some of the lowest recorded at this site since measurements started there in 1970. because of the sizes of the slabs and plates and their proximity to the ground, their temperatures are not strictly representative of bridge temperatures, but they provide useful supplementary information on the thermal behaviour of exposed concrete and steel. according to the royal meteorological society weather logs, a provision 'general value' of temperature for the winter of 1978/1979 suggests that it was the fifth coldest of the century in england and wales.(a)

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