| The dynamic response of a two-column bridge pier with an innovative structural frame and flexible footings was studied. The objectives of the study were to determine the effect of footing flexibility, the adequacy of using carbon fiber reinforced fabrics as primary reinforcement, and the performance of bents with shifted plastic hinges in columns. Also, extensive analytical work was performed to formulate a simple method to assess the amount of moment reduction due to footing flexibility.; A quarter-scale bent with square columns supported on isolated spread footings previously tested on a shake table was the primary subject of the study. Analysis of the experimental data revealed that footing flexibility significantly reduced the moments near the base of the frame. Using analytical models, design charts were created to assess the amount of moment reduction due to footing flexibility. Shifting of the plastic hinges and the design of the CFRP was shown to be successful using over-strength ratios and by examining the experimental data. |
