Incremental dynamic analysis of the long-span continuous beam bridge considering the fluctuating frictional force of rubber bearing

Abstract In the seismic design of long-span bridges, classic bi-linear model was used to simulate frictional restoring force rubber bearings. However, in actual earthquake, bearing suffered fluctuating axial pressure even separated from beam when vertical component earthquake too strong. Employing for may incorrectly estimate response bearings, as well whole bridge. This paper developed a nonlinear model, which can consider variation separation with directions. A typical continuous bridge modeled ABAQUS, and incremental dynamic analysis conducted quantitative comparison responses using different models. The intensity measure selected ratio peak ground acceleration (PGA) direction PGA horizontal direction. results indicated that led significant bearings piers, small. would underestimate demand piers.