Seismic performance of hollow circular bridge piers

Seismic performance of hollow bridge columns is a significant issue for a high-speed rail project in Taiwan because ductility of these columns varies with the type of lateral reinforcement. In this paper three hollow circular bridge piers are tested tinder a constant axial load and a pseudostatic, cyclically reversed horizontal load. Effects of ductility and dissipated energy are investigated. An analytical model is det,eloped to predict the moment-curvature relationship of each section and the load-displacement relationship of the columns. Test results are also compared with those from the proposed analytical model. Ductility factors of the tested specimens range from 2.8 to 9.0, and the analytical model satisfactorily predicts the load-displacement relationship of such columns with flexure failure.