Investigation of Settlement at Bridge Approach Slab Expansion Joint: Bump at the End of Bridge (0-4147-S)

A number of recently constructed bridge approach slabs using an articulation at mid span and the wide-flange terminal anchorage system have experienced settlement at their expansion joints (see Figures 1 and 2). This problem is more commonly referred to as the bump at the end of the bridge. It is estimated that the Texas Department of Transportation (TxDOT) spends $7 million each year for maintenance associated with the bump at the end of the bridge. This project investigated reasons for the bumps and recommended ways to improve the current situation. As part of the results, a new wide-flange terminal anchorage/bridge approach slab system that is less sensitive to weak embankments was designed and tested.