高速铁路梁桥减隔震研究

发布时间：2018-11-08 10:57

【摘要】：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。
[Abstract]:Research purpose: the safety, comfort and huge live load of high speed and smooth driving have strict requirements on the performance of bridge support of high speed railway, and the general isolation device is difficult to meet the requirements. Therefore, the design concept of functional separation is put forward in this paper, and a functional isolation system suitable for high-speed railway bridges is developed. The vibration table test is used to verify the control effect of the functional isolation system on the seismic response of the simple supported beam bridge of high speed railway. The conclusions are as follows: (1) after the functional isolation system works, the peak acceleration of bridge deck decreases by 30% and 51% under different intensity, which proves the effectiveness of the system. The weakening degree of Mesa acceleration is only related to the magnitude of the earthquake input intensity, but not to the characteristics of the input seismic wave. (2) the working mechanism of the functional separation type isolation system follows the design principle of the high speed railway bridge isolation based on the functional separation type isolation system proposed in this paper; (3) earthquake intensity has a great influence on the maximum horizontal sliding displacement of the functional separation type isolation system. The maximum horizontal sliding displacement increases with the increase of the earthquake intensity, and the reset condition of the functional separation type of isolation system is good. It exerts good hysteretic energy dissipation function and provides enough restoring force to prevent the transfer of energy to the superstructure of the bridge. (4) adjusting the horizontal stiffness of the lead-rubber bearing in the functional isolation system can effectively reduce the horizontal displacement of the beam under earthquake, and improve the applicability of the functional isolation system is the content of further research; (5) this conclusion can provide a new idea and means for the design and application of seismic isolation technology in the high speed railway simply supported bridge.
【作者单位】：广州大学工程抗震研究中心;新疆铁路局库尔勒电务段阿图什火车站;
【基金】：国家自科学联合基金重点项目:强震作用下高速铁路桥梁损伤破坏及全寿命性能设计与控制(U1334209)
【分类号】：U442.55

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