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研究目的:近年来,为满足人们对交通运输的需求,高速铁路工程事业正蓬勃发展,相应的高速铁路抗震问题也引起越来越多的学者们的关注。但是,一般的减隔震装置难以满足高速铁路地震时行车安全性的严格要求。基于此,本文针对罕遇地震作用下的高速铁路简支梁桥提出一种新型减隔震系统,并对新型减隔震系统的动力设计参数进行优化设计,使其更好地服务于高速铁路桥梁。研究结论:(1)在LRB性能参数的可行域内能够获得满足本文分析模型约束条件的最优解,因此优化设计提高了新型减隔震系统的控制效果,可降低生产成本;(2)新型减隔震系统对强震下高速铁路简支梁桥地震响应具有良好的控制效果,新型减隔震系统可在减少梁端纵向位移、保证桥墩不屈服的基础上,使桥墩底部的弯矩最小化;(3)在高速铁路简支梁桥的减隔震设计中,梁端纵向位移和桥墩剪力是主要约束条件,对新型减隔震系统性能参数最优解的选取起着重要作用;(4)利用SQP算法求解本文建立的优化设计模型,最优解收敛迅速且稳定;(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与手段。
Research purposes: In recent years, to meet people’s demand for transportation, high-speed railway projects are booming, and the corresponding high-speed railway aseismic problems also attracted more and more scholars attention. However, the general anti-vibration device can hardly meet the strict requirements of traffic safety during high-speed railway earthquakes. Based on this, this paper presents a new type of seismic isolation system for the high-speed railway simply supported girder bridge under rare earthquakes, and optimizes the dynamic design parameters of the new type of seismic isolation system to better serve the high-speed railway bridge. Research conclusions: (1) The optimal solution that satisfies the constraints of the analysis model in the feasible region of LRB performance parameters can be obtained. Therefore, the optimal design improves the control effect of the new seismic isolation system and reduces the production cost. (2) The isolation system has a good control effect on the seismic response of the high-speed railway simply supported girder bridge under the strong earthquake. The new anti-seismic isolation system can minimize the bending moment at the bottom of the pier on the basis of reducing the longitudinal displacement of the beam end, ; (3) In the seismic isolation design of simple supported high-speed railway bridges, the longitudinal displacement of the beam ends and the pier shear force are the main constraints, which play an important role in the selection of the optimal solution of the performance parameters of the new seismic isolation system. 4) Using the SQP algorithm to solve the optimal design model established in this paper, the optimal solution converges rapidly and steadily. (5) The conclusion of this study can provide new ideas and methods for the design and application of seismic isolation technology in simply supported high-speed railway bridges .