高速铁路简支梁桥减隔震研究

发布时间：2018-02-02 14:39

本文关键词： 减隔震系统高速铁路简支梁桥优化设计性能参数　出处：《铁道工程学报》2017年09期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Research objectives: in recent years, in order to meet the needs of transportation, high-speed railway engineering is booming, the corresponding high-speed railway seismic problems have attracted more and more attention of scholars. The general isolation device is difficult to meet the strict requirements of high speed railway seismic safety. Based on this, this paper proposes a new isolation system for the simple beam bridge of high speed railway under the action of rare earthquake. The dynamic design parameters of the new isolation system are optimized. Conclusion: 1) in the feasible range of LRB performance parameters, the optimal solution satisfying the constraint conditions of the analysis model can be obtained. Therefore, the optimal design can improve the control effect of the new isolation system and reduce the production cost. 2) the new isolation system has good control effect on the seismic response of the simple supported beam bridge of high-speed railway under strong earthquake. The new isolation system can reduce the longitudinal displacement of the beam end and ensure that the pier does not yield. Minimizing the bending moment at the bottom of the pier; 3) the longitudinal displacement of beam end and the shear force of pier are the main constraints in the seismic isolation design of the simple supported beam bridge of high-speed railway, which plays an important role in the selection of the optimal solution of the performance parameters of the new type of isolation system. 4) using SQP algorithm to solve the optimal design model, the optimal solution converges rapidly and stably. 5) this conclusion can provide a new idea and means for the design and application of seismic isolation technology in high speed railway simply supported bridges.
【作者单位】：广州大学工程抗震研究中心;
【基金】：国家自然科学联合基金重点项目(U1334209)
【分类号】：U442.55
【正文快照】： 1研究背景高速铁路以其运输能力大、速度快、安全性高、受气候影响小等优势,在全球范围内得到迅速发展[1]。根据2004年国务院批准的《中国铁路中长期发展规划》,到2020年我国铁路总里程达到5万公里左右[2]。为了充分贯彻节约土地的基本国策,加快铁路建设速度以适应国民经济发

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