Seismic Vulnerability Analysis of Double-column High-pier Rigid Frame Bridge with Tie-beams Subjected to Near-fault Earthquake Inputs

Due to short duration and high energy characteristics, near-fault earthquakes showed more destructive damage on bridges. For double-column hige-pier rigid frame bridges, tie-beams between double-columns play an important role in seismic resistance. Therefore, the influence of traditional reinforced concrete tie-beams and energy dissipation braces on the seismic performance of high-pier rigid frame bridges under near-fault earthquakes were analyzed base on the seismic vulnerability analysis. It was showed that as the number of tie beams increases, the plastic hinge curvature on the top and bottom of the pier gradually decreases, and the probability of exceeding each damage state also gradually decrease. Additionally the energy dissipation braces can greatly reduce the seismic response and the damage probability of the bridge structure.