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研究目的:高速平稳行车的安全性、舒适性、巨大的列车活荷载对高速铁路桥梁支座的性能有着严格要求,一般的减隔震装置难以满足要求。因此,本文提出功能分离的设计理念,研发适用于高速铁路桥梁的功能分离型减隔震系统,并采用振动台试验验证功能分离型减隔震系统对高速铁路简支梁桥地震响应的控制效果。研究结论:(1)功能分离型减隔震系统工作后,桥面峰值加速度在不同烈度下减少幅度达30%~51%,证实了功能分离型减隔震系统的有效性,台面加速度被削弱程度仅与地震输入烈度大小有关,与输入地震波特性无关;(2)功能分离型减隔震系统工作机制遵循了本文建议的基于功能分离型减隔震系统的高速铁路桥梁减隔震设计原则;(3)地震强度对功能分离型减隔震系统的最大水平滑动位移影响较大,最大水平滑动位移随着地震强度的增大而增加,功能分离型减隔震系统复位状况良好,发挥了良好的滞回耗能和提供了足够的恢复力的功能,阻止能量向桥梁上部结构的传递;(4)调节功能分离型减隔震系统中的铅芯橡胶支座的水平刚度,可有效减小梁体在地震作用下的水平位移,提高功能分离型减隔震系统的适用性是进一步研究内容;(5)该研究结论可为减隔震技术在高速铁路简支桥梁中的设计和应用提供全新的思路和手段。
Research purposes: The safety, comfort and huge train live load of high-speed and steady driving have strict requirements on the performance of high-speed railway bridge support. The general anti-vibration device can not meet the requirements. Therefore, this paper proposes the design concept of functional separation, and develops a functional separation type seismic isolation system suitable for high-speed railway bridges. The shaking table test is used to verify the control effect of the functional separation type seismic isolation system on the seismic response of high-speed railway simply supported girder bridges . The conclusions are as follows: (1) After working, the peak acceleration of bridge deck decreases by 30% -51% at different intensities, which confirms the effectiveness of the functionally separated damping system and the mesa acceleration is weakened The degree is only related to the magnitude of seismic input intensity and has nothing to do with the characteristics of input seismic wave; (2) The working mechanism of functionally separated seismic isolation system follows the design principle of seismic isolation and isolation of high-speed railway bridges based on the functionally separated seismic isolation system proposed in this paper; (3) Seismic intensity has a great influence on the maximum horizontal slide displacement of functionally separated seismic isolation system. The maximum horizontal displacement increases with the increase of seismic intensity. The functionally separated seismic isolation system is in a good reset state and performs well Of the hysteresis energy and provide sufficient resilience function, to prevent the energy transfer to the superstructure of the bridge; (4) adjust the function of separate damping system, the horizontal stiffness of the lead rubber bearing can be effectively reduced The horizontal displacement of the beam body under earthquake action and the further improvement of the applicability of the functionally separated seismic isolation system are the further research contents. (5) The conclusion of this study can be used in the case of the simplified seismic isolation of high-speed railway simply supported bridges In the design and application of new ideas and means.