Performance of Orthotropic Bridge Decks

The performance of orthotropic steel bridge decks in North America is investigated, and the performance of the wearing surface of these bridges is the focal point of the study. Concrete deck deterioration has become a national concern in the past few years. Orthotropic steel decks have a relatively long life span and are generally economical to maintain. Because of higher initial costs and lack of performance data, their use has not been widespread. Twelve bridges with orthotropic decks in the U.S. and Canada were studied through a questionnaire survey and telephone interviews with the responsible authorities. It was found that steel decks require very little maintenance. Furthermore, corrosion of steel and fatigue of welded connections have not created major problems. Surface overlay has performed relatively poorly in some instances, especially under adverse weather conditions. It was found that adverse climate, excessive deck flexure, excessive traffic loads, and poor paving procedures were the main causes for the problems associated with the wearing course performance.