Abstract Research purposes：At present，the deformation capacity analysis method based on the moment-curvature analysis of the bottom cross-section and the plastic hinge models is widely used in the domestic and foreign seismic design codes for bridges to quantify the ductility ability of piers under horizontal seismic load．In order to investigate the applicability of this analysis method to the seismic design of railway bridge piers in China，the theoretical analysis and experimental verification of the deformation capacity of the round-ended railway bridge piers which is still lack of research currently are executed．
Research conclusions：(1)The theoretical calculation results of the deformation capacity of the round—ended pier specimens correspond with the test results very well，and the deformation capacity analysis method based on the moment curvature analysis of the bottom cross-section and the plastic hinge models can be applied to the seismic design of the round—ended railway bridge piers．(2)The empirical formula of equivalent plastic hinge length and the ductility safety factor of the maximum permissible angle of the plastic hinge of the round-ended railway bridge piers can be same with the Chinese code JTG／T B02-01 and CJJ 166．(3)The deformation capacity analysis method of round—ended piers presented provides a practical method and basis for seismic ductility design of the round-ended railway bridge piers in China．
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2014, Vol. 31 
