United States Department of Transportation
i
Temperature differential of swingspan bridges : final report.
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1969-06-01
[PDF-3.85 MB]
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Abstract:This report describes a study performed to determine the temperature differential of the top and bottom member of one side of a swingspan bridge. Three bridges were used in the study. Bridge No. 1 was an equal-arm swingspan bridge, Bridge No. 2 was a truss swingspan bridge, and Bridge No. 3 was an unequal-arm swingspan bridge.
Thermocouples were attached at 22 locations on each bridge to measure temperature, and a strip chart recorder was used to record the data. A one-year cycle was recorded for each bridge studied.
The results of the study indicates that for Bridge No. 1 there was 144 occurrences of a temperature differential in excess of 15F, for Bridge No. 2 there were 37 occurrences in excess of 15F and 190 occurrences in excess of 10F, and for Bridge No. 3 there were 93 occurrences in excess of 15F.
These results would tend to indicate that perhaps the design criteria of 10F differential for truss swingspan bridges and 15F differential for other types of swingspan bridges should be revised.
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