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Date of Publication:2022-10-09

Journal:土木工程学报

Issue:10

Page Number:80-86

ISSN No.:1000-131X

Abstract:A direct displacement-based seismic design procedure of RC bridge piers fulfilling multiple performance objectives, which usually require that the structure can sustain a minor earthquake without any damage, a moderate earthquake with repairable structural damage, and a strong earthquake without collapsing, is developed by means of the improved capacity spectrum method. The procedure uses the yield displacement and displacement ductility factor as the design parameters and uses the inelastic seismic demand spectrum with yield spectral accelerations and yield displacements format to calculate the seismic demands of the pier under different earthquake levels. Seismic capacities of the pier are determined by acceptable structural damages, which are estimated quantitatively by using both the strains of concrete and the longitudinal steels in plastic hinge zones, and expressed as displacements at top of the pier by transforming from the relationship between curvature ductility factor and displacement ductility factor. The shear strength of the pier is also checked using the concept of capacity design in order to avoid brittle shear failure. The feasibility of the proposed method is validated by using an example on the seismic design of a single bridge pier.

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