Evaluation of Longitudinal Cracking in End Regions of Pretensioned Box Beams

This study investigates the irregular, longitudinal cracking patterns occurring in bottom flanges of prestressed concrete box beams from the Hicks Road Overpass along U.S. Highway 287 in Tarrant County near Fort Worth, Texas. Testing of two, 65 foot box beams from the actual bridge was conducted to determine existing beam capacity and evaluate the cracking patterns.

Results from testing were analyzed and compared with current AASHTO standards. Longitudinal cracking was mapped and evaluated relative to the structural detailing. Past and current TxDOT standards were reviewed for box beam detailing and a recommendation was made for improved detailing of these box beams in the future.