Structural Behavior of Bent Cap Beams in As-built and Retrofitted Reinforced Concrete Box-Girder Bridges By Mohamed Aly Abdel-Razik Moustafa A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Engineering – Civil and Environmental Engineering in the Graduate Division of the University of California, Berkeley Committee in charge Professor Khalid M. Mosalam, Chair Professor Stephen A. Mahin Professor Allan Sly Fall 2014