[1]李雪红,孙磊,徐秀丽,等.地震动多点激励对高铁桥梁地震响应的影响研究[J].自然灾害学报,2018,(03):012-20.[doi:10.13577/j.jnd.2018.0302]
 LI Xuehong,SUN Lei,XU Xiuli,et al.Study on the influence of multi-support excitation of earthquake on seismic response of high-speed railway bridge[J].,2018,(03):012-20.[doi:10.13577/j.jnd.2018.0302]
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地震动多点激励对高铁桥梁地震响应的影响研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
期数:
2018年03期
页码:
012-20
栏目:
出版日期:
2018-06-28

文章信息/Info

Title:
Study on the influence of multi-support excitation of earthquake on seismic response of high-speed railway bridge
作者:
李雪红 孙磊 徐秀丽 林珊 杜杨开物
南京工业大学 土木工程学院, 江苏 南京 211816
Author(s):
LI Xuehong SUN Lei XU Xiuli LIN Shan DU Yang Kaiwu
School of Civil Engineering, Nanjing Tech University, Nanjing 211816, China
关键词:
高铁桥梁多点激励有限元分析行车安全轨道变形
Keywords:
high-speed railway bridgemulti-support excitationfinite element analysistraffic safetytrack deformation
分类号:
U442.5+5;X9
DOI:
10.13577/j.jnd.2018.0302
摘要:
长大高铁桥梁墩柱基础所处地质条件可能存在较大差异,地震动的特性会发生较大变化,若不考虑这种变化,计算结果不能反映桥梁实际地震响应,甚至可能偏不安全。以24跨跨径为32 m的高铁简支梁桥为研究对象,采用绝对位移法考虑地震动的多点激励,分析主梁和轨道的位移和变形、支座剪力和位移以及桥墩的变形及内力等地震响应特性,并与一致激励进行对比。结果表明:考虑多点激励后,场地转换处轨道和主梁的横向和竖向相对位移均明显增大,轨道整体变形呈蛇形波动,在伸缩缝处出现局部突变,轨道的这些变形特性会严重威胁高速运行的列车的行车安全;在场地转换处主梁纵向相对位移亦显著增大,可能造成落梁;支座和墩柱的位移和内力主要受场地类型的影响,场地越不利,地震响应越大。
Abstract:
The geological conditions where the pier base of high-speed railway bridge locates may have great differences, and the characteristics of ground vibration will change greatly, if not considering this change, the results can not reflect the actual seismic response of the bridge, thus may even lead the unsafe conditions. By taking the high speed simply supported girder bridge of 24 spans with 32m in span as the research object, and considering the multi-support excitations of ground vibration through using the absolute displacement method, the displacement and deformation of the girder and rail, the shear force and displacement of bearing and the deformation and inner stress of pier deformation and other seismic response characteristics are analyzed and compared with the uniform excitation. The results show that after considering the multi-support excitations, the horizontal and vertical relative displacement of railroad track and girder at the site conversion area will increase significantly, the global deformation of the track is S-shaped, the local sudden changes occur at the expansion joint and these deformation characteristics of track will be a serious threat to the safety of high-speed operation of the train; the longitudinal displacement of girder at the site conversion is also increased significantly, and this case may cause the falling of girder; the internal stress and displacement of bearings and piers are mainly affected by the type of site, and as more unfavorable of the site, the lager the seismic response is.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2017-08-22;改回日期:2017-09-30。
基金项目:江苏省"六大人才高峰"资助项目(2014-JZ-006)
作者简介:李雪红(1974-),女,教授,博士,从事桥梁结构的抗震和安全评估研究.E-mail:lixuehongnj@163.com
更新日期/Last Update: 1900-01-01