Seismic Performance Of Prefabricated Pier With Grouted Sleeve And Damper

The construction of prefabricated bridge structure is fast and efficient.The connection mode of grouting sleeve can better ensure the integrity and stability of prefabricated piers.But at present,the conventional grouting sleeve piers obtained based on bridge ductility design method have great damage after earthquake.In order to reduce the damage of prefabricated pier with grouting sleeve and resume the function of the pier in a timely manner,the concept of the prefabricated pier with damper grouting sleeve was proposed.The damper dissipates energy before the pier is destroyed to reduce the destroy.The seismic performance and related problems of grouting sleeve piers with additional dampers are studied.(1)The structure of assembled pier with damper is put forward.The energy dissipation theory of replaceable damper is summarized from the theoretical research,as well as the commonly used calculation constitutive for numerical simulation of dampers,and the computational model of dampers.A logical constitutive relation of damper is chosen according to the type and force of dampers.Through the analysis,this paper finally uses the viscoelastic velocity damper and Burgers model.(2)A conventional prefabricated pier with grouting sleeve were set up in ABAQUS.To compare the seismic performance between conventional pier and existing tests bridge pier,respectively.The conclusion display that the validity of the numerical analysis results.(3)Two models were established to compare the seismic performance between conventional pier and bridge pier with replaceable damper,respectively.The conclusion display that the bearing strength and cumulative capacity wasting of the precast pier with damper are 10% and 27% higher than conventional bridge pier.The maximum residual displacement of the precast pier with damper decrease by 19%.(4)The control variable method is used to set 10 different working conditions for the grouting sleeve piers with additional dampers,and the effects of the slender proportion of the piers and the incipient prestress of tendons on the seismic performance of the piers are studied respectively.The analysis shows that increasing the initial prestress of the bridge pier tendons can improve the energy dissipation capacity of the grouting sleeve piers with additional dampers.Reducing the slenderness ratio of the additional damper grouting sleeve pier can effectively improve the mechanical performance and the overall stability of the pier.