Research Of Tenon Seismic Isolation System And Its Application To Long-span Continuous Girder Bridges

Research in this paper was carried out based on the improvement of Shock Absorber Theory proposed before. Pseudo-static test of the damping tenon, which is designed according to the requirement of real project, was done to analyze the Hysteretic curves, Skeleton-frame curves and other coefficients. Test results proved that damping tenon is able to absorb earthquake energy even if it is severely deformed. This excellent materials' property makes the tenons able to resist huge displacement between the bridge girder and pier during big earthquake.After regular Pseudo-static testing, numerical simulation was utilized to calculate Hysteretic curve and Capacity curve, which validated the accuracy of the experiment and helped figuring out the material's elastic and plastic developing status and the materials' random intensifying characteristic. With the help of Hysteretic Model, energy dissipation ability of carbon steel tenon was further analyzed and proved proper to be made essential component of the Seismic Isolating System.With the tenon's proved excellent in consuming earthquake energy, manufacture of Seismic Isolating System was also proposed in this paper. This system was made of damping tenon, speed locker and sliding support.Furthermore, the Tenon Seismic Isolating System was practiced on two real projects:a six-span steel box girder continuous bridge and a four-span concrete box girder continuous bridge. Through nonlinear time history analysis, dynamic response of the bridges that was equipped and not equipped with Isolating System are compared. Research result testified the Tenon Seismic Isolating System was able to enhance earthquake resistant capacity of long-span continuous bridges.