Seismic Performance Analysis And Economic Risk Assessment Of Self-centering Bridge Piers With Energy Dissipation Devices

Bridge as the lifeline of transportation plays an extremely important role in the reduction of earthquake disasters,and its seismic performance directly determines the earthquake casualties and economic property damage.This paper,based on the performance of the design concept and energy dissipation of the seismic thinking,mainly studied the bridge piers seismic deformation,energy dissipation energy,self-centering and other properties,and put forward a chimeric self-resetting energy dissipation piers node design method,Numerical analysis,theoretical analysis and software modeling were carried out to study the seismic performance of the whole self-resetting bridge structure in the earthquake.The main contents of this paper are as follows:(1)The components of the chimeric self-resetting energy dissipation pier are introduced in detail,namely,the load-bearing components of the pier itself,the self-resetting components of the prestressed tendons,the energy dissipation components of the damper and the fitting parts of the mating fittings.And type,performance,and hysteresis model are investigated in order to rationally select energy-consuming components.(2)Based on the traditional bridge structure,a joint design of chimeric self-resetting energy dissipation pier is proposed,and a feasible assembling method and implementation scheme of mating bridge pier are proposed.The stress characteristics of chimeric self-resetting energy dissipation piers,such as the restraint force of prestressed components,the flexural capacity of bridge pier and the bearing capacity of shear piles,are introduced.The design steps of each component of self-resetting piers are also presented.(3)Pushover analysis and dynamic time history analysis of self-resetting energy dissipation piers using SAP2000 finite element analysis software are performed.The results show that the initial tension of the prestressed tendon can increase the strength of the bridge pier and increase the prestressing force of the prestressed tendon effectively to control the maximum displacement of the column top of the bridge,and increase the damper The yield force can effectively increase the energy consumption of the bridge structure.According to the results of dynamic time history analysis,it can be seen that the residual deformation of self-resetting energy dissipation pier is much smaller than that of traditional ductile pier,and can be completely avoided.Thus its seismic performance is obviously superior to traditional pier.(4)The design step of the cross section based on the performance of the chimeric self-resetting energy dissipation pier and the design method of the displacement of the self-resetting piers are given.The evaluation process and concrete steps of seismic economic risk assessment method of self-resetting energy dissipation bridge are expounded.The seismic economic loss assessment of self-resetting bridge and traditional bridge is carried out by PEER quadratic integration method.Analysis results from a case study shows that the self-centering bridge has a good economic advantage over the conventional ductile one.