Cable-stayed bridges have been firmly established as the most efficient and cost effective structural form in the 152-meter (m) to 472-m span range. With widespread popularity of cable-stayed bridges around the world, longer spans are being constructed employing increasingly longer stay cables. The stay cables are laterally flexible structural members with very low fundamental frequency and very little inherent damping. For this reason, the stay cables have been known to be susceptible to excitations, especially during construction, wind, and rain-wind conditions. Recognition of this susceptibility of stay cables led to the use of some mitigation measures on several of the earlier structures. These included cable cross-ties that effectively reduce the free length of cables (increasing their frequency) and external dampers that increase cable damping. Perhaps due to the lack of widespread recognition of the stay cable issues by the engineering community and the supplier organizations, the application of these mitigation measures on early bridges appear to have been fairly sporadic. However, those bridges incorporating cable cross-ties or external dampers have generally performed well.
This report summarizes the accomplishments of a field investigation project that was conducted in order to understand the mechanisms of wind- and rain...
The objectives of this project were to:• Identify gaps in current knowledge base• Conduct analytical and experimental research in critical areasâ€...
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United States Department of Transportation
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