Experimental study on seismic performance of the self-resetting precast segmental bridge piers
Based on the post-tensioning technology of unbonded tendons,this paper proposed a novel type of self-centering precast segmental bridge pier(SPSBP)to enhance the seismic performance and address post-earthquake reparability issues of prefabricated bridge piers.The SPSBP consists of prefabricated components(cap beams,segments,base),replaceable energy-dissipating angle steels,and connecting steel plates.Three sets of comparative experiments were conducted to investigate the SPSBP through quasi-static tests,considering three parameters:initial prestressing force,thickness,and length of energy-dissipating angle steels.The experimental results demonstrate that this new structural form exhibits excellent self-centering and energy-dissipating capabilities.When reaching the maximum displacement ratio,the deformation of the specimens mainly concentrates on the energy-dissipating angle steels,with no significant damage observed in the main prefabricated structure,indicating its integrity.Increasing the initial prestressing force effectively enhances the structural bearing capacity and seismic performance while reducing residual deformation.Increasing the thickness of energy-dissipating angle steels can enhance the energy dissipation capability and bearing capacity of SPSBP.The length of energy-dissipating angle steels has an insignificant impact on the performance of SPSBP.
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