Efficiency Analysis on Lateral Seismic Performance Improvement of Existing Highway Bridges Based on Triangular-Plate Added Damping and Stiffness Damper
In view of the insufficient seismic capacity of reinforced concrete retainers in continuous girder bridges with laminated rubber bearings,and making full use of the friction sliding capability of plate rubber bearings,we proposed a technical scheme to improve the lateral seismic performance of existing bridges by triangular-plate added damping and stiffness damper(TADASD).Firstly,we derived the mechanical properties of TADASD.Taking the displacement ductility of the plate rubber bearing as the design goal,we gave the design method and flow of TADASD to improve the seismic capacity of small-and-medium-span continuous girder bridges.Secondly,we established the finite-element modeling of a typical existing small-and-medium-span continuous girder bridges in strong earthquake area of Yunnan,and evaluated the lateral seismic performance of the impact of TADASD on it by endurance time analysis.The feasibility and effectiveness of the design method was demonstrated through parameter analysis,and the recommended values of key design parameters are given.The results show that the TADASD has satisfactory energy dissipation capacity,which can ensure that the pier does not have excessive damage under strong earthquakes and effectively control the lateral horizontal displacement of the laminated rubber bearings.When the design parameters are reasonable,the proposed design method of TADASD is effective.Finally,the optimal design parameters are given by comprehensively considering safety and economy.
existing continuous girder bridgelaminated rubber bearingssteel retainersdesign methodendurance time analysis
万方数据
维普
