Abstract：Abstract：Research purposes： High-speed smooth driving safety, comfort, huge live load on the high-speed railway bridge bearing performance have strict requirements, the general isolation device is difficult to meet the requirements. Therefore, in this paper a functional separation design concept is proposed, function separation isolation system is developed for the high-speed railway bridge, and the control effect of function separation isolation system on seismic response of high speed railway bridge is verified by shaking table test. Research conclusions： (1) After the function separation isolation system works, the peak acceleration of the bridge floor is reduced to 30%~51% under different intensities, which proves the effectiveness of the separated seismic isolation system. The degree of shaking table acceleration is only dependent on the magnitude of seismic input, and is independent of the input seismic wave characteristics. (2) The principle of seismic isolation design is proposed in this paper for the high-speed railway bridge based on the function separation seismic isolation system. The working mechanism of the function separation isolation system follows the principle of seismic isolation design. (3) The earthquake intensity has a great influence on the maximum horizontal slip displacement of the separated seismic isolation system, and the maximum horizontal slip displacement increases with the increase of seismic intensity. The performance of the function separation seismic isolation system is good, and the hysteretic energy dissipation and sufficient restoring force are provided to prevent the transmission of energy to the superstructure of the bridge. (4) To adjust the horizontal stiffness of the lead rubber bearing in the function separated seismic isolation system, it can effectively reduce the horizontal displacement of the beam under earthquake. Improving the applicability of unction separated seismic isolation system is the further research content. (5) The research results can provide a new way of thinking and means for the design and application of the seismic isolation technology for the simple supported bridges of high-speed railways.
2017, Vol. 34 
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