Annual Movement Study of Bridge Deck Expansion Joints

摘要

For the purpose of refining bridge deck expansion joint details, the annual movement of approximately 231 expansion joints was recorded each year over a period of three years. The movement was traced by a sharp pointed metal scribe on a target painted on the metal tube of the bridge railing. The recorded movement was reduced by a correction factor, which included allowances for: differences in thermal coefficient of expansion and temperature conductivity between metal rail and concrete structure, span end rotation, incompressible debris in the deck joint, and truck impact. How the value of these corrections was determined is explained. Both the actual and corrected measurements are given. (Author)