studs, puddle welds or other mechanical connections. In the bridge industry, the forms are supported on a cold- formed angle that allows the contractor to adjust the form elevation to account for variations in the flange thickness or differential camber between adjacent girders. The support angles lead to eccentric connections that substantially reduce the stiffness of the PMDF systems. The objective of the research outlined in this report is to improve the understanding of the bracing behavior of PMDF systems used in the bridge industry as well as developing improved connection details between the support angles and the girder flanges. The research included laboratory tests and finite element analytical (FEA) modeling. The laboratory studies included shear tests, full scale testing of a twin girder system with a 50 ft. span. Both lateral load tests and buckling tests were conducted on the twin girder system with PMDF for bracing. In addition to demonstrating the behavior of the bracing systems, the laboratory studies where also used to validate the computer models of the bracing systems so that parametric FEA studies could be conducted. Modified details for the connection angles consisted of stiffening angles that span between adjacent girders at intermediate locations along the girder length. The stiffening angles substantially increased the stiffness of the PMDF system The modified details make PMDF systems a viable bracing alternative in steel bridges that can significantly reduce the number of cross-frames and diaphragms required for stability bracing. !?.KeyWords 18. Distribution Statement permanent metal deck forms, shear diaphragm, bracing, No restrictions. This document is available to the public through steel bridge, buckling the National Technical Information Service, Springfield, Virginia 22161. 19. Security Classif. (of report) 20. Security Classif. (of this page) 21. No. ofpages 22. Price Unclassified Unclassified !50 Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
Lateral Bracing of Bridge Deck Girders by Permanent Metal Deck Form
Jun 20, 2023
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