The Cubic Curves Hysteresis Model of Steel Bridge Piers for Seismic Response Simulation

In this paper, a cubic type curve approximate hysteretic model for steel bridge pier is proposed. Simple equation curves are used to express restoring force-dislplacement relation of steel piers. The hysteretic rules introduved in this model are established based on the hysteretic characteristics not only observed from quasi-static tests in past, but also based on cunducted fybrid tests in thissyudy. A sesries quasi-static tests and hybrid tests are conducted using 3types of specimens and 6 accelerograms of strong ground motions. By conparing the results of tests and the simulation, it has been testified that this cubic curve type model can simulate the inelastic hysteresis behavior and earthquake response of steel piers in high precise, even in large displacement range where the piers experience local buckling near to collaps