2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference
Dr. Charles-Darwin Annan, Université Laval
Dr. Mario Fafard, Université Laval
Mr. Eric Levesque, Structal Bridges
Metallizing is becoming a commonly used corrosion protection solution for steel bridge members, and bridge designers need to know the slip resistance of metallized faying surfaces in order to eliminate the currently costly and time-consuming practice of masking off connection faying surfaces before metallizing. The slip resistance evaluation involves essentially two major processes; firstly, short-duration static load tests to determine the mean slip coefficient, and if the evaluated slip coefficient values are found to be satisfactory, long-term sustained tension creep tests are required to examine the effect of creep of the coating on the slip resistance. A post-creep slip test is finally carried out as part of the evaluation. Earlier tests have revealed significant slip coefficients for metallized faying surfaces beyond those specified by North American design standards for uncoated surfaces. The present study evaluates the long-term sustained tension creep performance of metallized faying surfaces used with slip-critical connections. Results of this study have indicated significant slip and creep performance, and this is likely to influence future code revisions and impact steel bridge fabrication in North America.