The Self-centering Energy Dissipation Bridge Pier Is Based On The Performance-based Seismic Design And Seismic Economic Loss Evaluation Of Self-centering Bridge Piers

As a post-earthquake rescue lifeline,highway bridges play an extremely important role in rescue,rehabilitation,etc.after an earthquake.Its use performance after the earthquake will directly determine casualties and property losses in the affected areas.In this paper,the theoretical analysis and numerical simulation are used to study the force characteristics,energy dissipation mechanism and self-centering ability of self-centering bridge piers under earthquake.A displacement-based design method for self-centering energy dissipation piers is proposed.In addition,in order to provide decision-making departments with decision-making basis,this paper also studies the method of seismic economic risk assessment of self-centering energy-consuming bridge structures.The main contents of this paper are as follows:(1)The design concept of self-centering energy-consuming bridge piers and the composition of the components are proposed,including the pier's own load-bearing components,unbonded prestressed tendons,energy dissipation dampers,and bridge pier joints.The energy dissipation mechanism and hysteretic behavior of common dampers are studied and analyzed,and the most suitable energy dissipation components are selected through performance comparison analysis.(2)The mechanical properties of the self-centering energy dissipation bridge piers are studied and the design of the self-centering energy dissipation pier is proposed based on the structure of the traditional piers.Through theoretical analysis,the force characteristics and energy dissipation mechanism of self-centering energy dissipation piers are studied.The design ideas of the self-resetting energy dissipation piers are also introduced.(3)The static and elastic plastic analysis and dynamic time history analysis of the pier model were performed by finite element simulation of SAP2000.The theoretical analysis and software simulation analysis results show that increasing the initial tensile stress of the prestressed tendons can increase the yield of the bridge piers;properly increasing the yield force of the energy dissipation dampers can well control the horizontal displacement of the pier structures;appropriately increasing the prestress The stiffness of the ribs can increase the seismic performance of the pier and control the horizontal displacement at the top of the pier.Through dynamic time history analysis,it can be known that the residual displacement of the self-centering energy dissipation pier is smaller than that of a traditional ductile pier,and its seismic performance is better than that of a traditional pier.(4)A displacement-based seismic design method for self-centering energy-conserving bridge piers is proposed.In this paper,the nonlinear displacement design spectrum method is adopted and the feasibility of this method is verified by an example analysis.At the same time,the economic loss assessment method for self-centering energy-consuming bridges is studied.The method is used to evaluate the economic loss of the bridge structure.It is demonstrated that the self-centering energy-consuming bridge has excellent seismic performance and good economic benefits.