The purpose of this study was to conduct slip coefficient testing of bolted connections made from ASTM A709 Grade 50CR steel to determine how they fit into the current AASHTO LRFD Bridge Design Specifications surface condition classifications. At this time, Grade 50CR steel is not included in these classifications because it was not being used for bridges when the existing surface condition classifications were developed. The slip coefficient tests in this study were conducted according to the Research Council of Structural Connections. Some test specimens were made up entirely of Grade 50CR steel, while others were dissimilar metal connections, consisting of Grade 50CR steel and either weathering or galvanized steel. Dissimilar metal connections were included in the testing because their use is anticipated in which a bridge girder would be constructed using both Grade 50CR steel and other ASTM A709 bridge steels. Results showed that unblasted Grade 50CR steel has a slip coefficient value of at least 0.30, meeting the current AASHTO Class A surface condition for unblasted steel. Blast-cleaned Grade 50CR steel from either steel shot or garnet media has a slip coefficient value of 0.50, meeting the current AASHTO Class B surface condition for blast-cleaned steel. When dissimilar metal connections are made with Grade 50CR steel, the design slip coefficient value of the connection can be taken as equal to the smaller of the two slip coefficient values being joined.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Slip Coefficient Testing of ASTM A709 Grade 50CR and Dissimilar Metal Bolted Connections


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2021-04-04




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Evaluation of Stainless Steel Fasteners for Bolted Field Splice Connections of ASTM A1010 Corrosion-Resistant Steel Plate Girders

    Williams, Thomas R. / Xia, Xuemeng / Darby, Thomas E. et al. | Transportation Research Record | 2017


    How To Control Critical Bolted Connections

    Gleitsmann,M. / Vohl,B. / International Harvester,US | Automotive engineering | 1983


    Ultrasonic Evaluation of Bolted Connections in Satellites

    Montoya, Angela / Doyle, Derek / Maji, Arup et al. | Tema Archive | 2014


    ASTM Engine Coolant Testing

    Ailor, W. H. | SAE Technical Papers | 1979