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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

47

期数:

2024年01期

页码:

27-36

栏目:

出版日期:

2024-01-01

文章信息/Info

Title:

Geometrical Irregularity of High-speed Railway Bridge Tracks Considering Seismic Spectrum Characteristics

作者:

甘 霖¹; 2; 郭恩栋¹; 2; 吴厚礼¹; 2; 李长宏¹; 2; 刘 聪¹; 2

(1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080; 2.地震灾害防治应急管理部重点实验室,黑龙江 哈尔滨 150080)

Author(s):

GAN Lin¹; 2; GUO Endong¹; 2; WU Houli¹; 2; LI Changhong¹; 2; LIU Cong¹; 2

(1.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China)(2.Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,Heilongjiang,China)

关键词:

高速铁路桥梁-轨道;  残余变形;  频谱特性;  非线性时程分析

Keywords:

high-speed railway bridge tracks;  residual deformation;  spectral characteristics;  nonlinear time history analysis

分类号:

U212.35

DOI:

10.20015/j.cnki.ISSN1000-0666.2024.0027

摘要:

以一座典型高速铁路五跨简支梁桥为例,建立了精细化高速铁路桥梁-轨道系统有限元模型。针对不同类型频谱特性选取了近场脉冲型、近场无脉冲型、远场长周期型和普通型地震动。输入不同频谱特性的地震动,对结构进行非线性时程响应分析,探究不同频谱特性地震动对轨道残余变形的影响规律及变形特点。结果表明:不同类型地震动对轨道残余变形的影响程度不同,轨道结构对近场脉冲型地震动的作用最为敏感; 不同类型地震动作用下,轨道横向残余变形规律相似,均表现为全桥中间部分变形最大; 每跨桥梁跨中竖向残余变形远大于桥墩(桥台)位置竖向残余变形; 梁缝位置为轨道薄弱部分,轨距残余变形在每跨桥梁梁体连接处有明显尖刺状的突变。当PGA>0.2 g时,不同类型地震动作用下的轨道变形均随着PGA的增大而增大; 当PGA=0.38 g时,桥梁已经进入塑性状态,地震动类型对于轨道残余变形的影响程度降低。

Abstract:

Taking a typical five-span simply supported beam bridge of the high-speed railway as an example,a refined finite element model of high-speed railway bridge-track is established.According to the spectral characteristics of different types of ground motions,near-field-pulse type,near-field non-pulse type,far-field long-period type and ordinary type are selected.The ground motions with different spectral characteristics are input,and the nonlinear time-history analysis of the structure is carried out to explore the influence of different types of ground motions on the residual deformation of the track.The results show that the ground motions with different spectral characteristics have different effects on the residual deformation of the track,and the structure is most sensitive to the near-fald pulsetype ground motion.Under the action of various types of ground motion,the transverse residual deformation law of the rail is similar,and the residual deformation is the largest in the middle part of the whole bridge.The vertical residual deformation in the mid-span of each span bridge is much larger than that of the pier(abutment)position.The position of the beam joint is the weak part of the track,and the residual deformation of the gauge has an obvious sharp mutation at the connection of the beam body of each span.When PGA>0.2 g,the track deformation under the action of various types of ground motion increases with the increase of PGA.When PGA=0.38 g,the bridge has entered the plastic state,and the influence of ground motion type on track residual deformation is reduced.

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备注/Memo

备注/Memo:

收稿日期:2023-04-26
基金项目:中国地震局地震工程与工程振动重点实验室重点专项(2021EEEVL0204).

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更新日期/Last Update: 2023-12-20