全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
工程力学  2012 

考虑桩-土相互作用的多年冻土区多跨简支梁桥地震响应分析

DOI: 10.6052/j.issn.1000-4750.2011.03.0185, PP. 183-190

Keywords: 多年冻土,多跨简支梁桥,地震响应,桩-土相互作用,行波效应,碰撞

Full-Text   Cite this paper   Add to My Lib

Abstract:

为分析青藏铁路多年冻土区多跨简支梁桥地震响应情况,建立了一座10×32m箱形多跨简支梁桥三维全桥模型,以等效基础弹簧考虑桩-土相互作用;以具有初始间隙的并联弹簧-阻尼单元模拟伸缩缝两端结构的碰撞,研究了冻土融化深度、行波效应及碰撞效应对多跨简支桥梁结构地震响应的影响。结果表明:随着融土下限加深,等效基础弹簧刚度明显减小,在强地震动作用下,桥梁结构易发生落梁、桥墩倾覆等震害;当相邻碰撞体的相向位移超过伸缩缝宽度时两者发生碰撞,碰撞次数及碰撞力随地震动视波速及行进距离不同而不同,在行波波速较低且行进距离较小时碰撞效果明显,对桥梁地震响应影响较大,极易导致落梁;此外桥台对结构地震响应亦有显著影响。在对多年冻土区多跨简支梁桥抗震性能进行评估时,应特别重视夏季地震动低速行波时可能发生的震害。

References

[1]  Gao Yunxue, Yang Yucheng, Tan Yingkai. Earthquake damage to brick buildings and its mitigation in cold region [C]. International symposium on Cold Region Development, Harbin China, 1988, 2: 1―8.
[2]  刘鸿绪, 孙彦福, 陈亚明, 等. 季节冻土层对房屋地震破坏的影响[J]. 冰川冻土, 1998, 20(1): 46―50.
[3]  Liu Hongxu, Sun Yanfu, Chen Yaming, et al. Influence of seasonally frozen ground on the seismic damages of buildings [J]. Journal of Glaciology and Geocryology, 1998, 20(1): 46―50. (in Chinese)
[4]  徐学燕, 徐春华, 李晓稚. 冻土场地地震加速度反应谱研究[J]. 岩土工程学报, 2003, 25(6): 680―683.
[5]  Xu Xueyan, Xu Chunhua, Li Xiaozhi. Research on earthquake acceleration response spectrum of frozen soil ground [J]. Chinese Journal of Geotechnical Engineering, 2003, 25(6): 680―683. (in Chinese)
[6]  Vaziri H, Han Y C. Full-scale field studies of the dynamic response of piles embedded in partially frozen soils [J]. Canadian Geotechnical Journal, 1991, 28(5): 708―718.
[7]  Suleiman M T, Sritharan S, White D J. Cyclic lateral load response of bridge column-foundation-soil systems in freezing conditions [J]. Journal of Structural Engineering, 2006, 132(11): 1745―1754.
[8]  吴志坚, 王平, 霍元坤, 等. 多年冻土区桥梁桩基础地震响应的模型振动试验研究[J]. 西北地震学报, 2009, 31(4): 319―326.
[9]  Wu Zhijian, Wang Ping, Huo Yuankun, et al. Study on shaking table test for seismic response of pile foundation of bridges at the permafrost regions [J]. Northwest Seismological Journal, 2009, 31(4): 319―326. (in Chinese)
[10]  Feng Xiong, Yang Zhaohui. Effects of seasonally frozen soil on the seismic behavior of bridges [J]. Cold Regions Science and Technology, 2008, 54(1): 44―53.
[11]  陈兴冲, 高峰, 吴少海. 冻土层对桥梁地震反应的影响[J]. 工程力学, 2007, 24(3): 120―125.
[12]  Chen Xingchong, Gao Feng, Wu Shaohai. Effect of frozen soil layer on seismic response of bridges [J]. Engineering Mechanics, 2007, 24(3): 120―125. (in Chinese)
[13]  陆鸣, 李小军. 青藏铁路四座主要桥梁工程场地地震安全性评价报告[R]. 哈尔滨: 中国地震局工程地震研究中心, 2001.
[14]  Lu Ming, Li Xiaojun. Report of seismic security estimation on engineering site of four bridges in Qinghai-Tibet Railway [R]. Harbin: Research Center of Seismic Engineering, China Earthquake Administration. 2001. (in Chinese)
[15]  杜修力, 赵密, 王进廷. 近场波动模拟的人工应力边界条件[J]. 力学学报, 2006, 38(1): 49―56.
[16]  Du Xiuli, Zhao Mi, Wang Jinting. A stress artificial boundary in FEA for near-field wave problem [J]. Chinese Journal of Theoretical and Applied Mechanics, 2006, 38(1): 49―56. (in Chinese)
[17]  Lysmer J, Udaka T, Tsai C F. FLUSH a computer program for approximate 3-D analysis of soil-structure systems [R]. Report No. EERC75-30, Earthquake Engineering Research Center, University of California, Berkeley, 1975.
[18]  Baltay P, Gjelsvik A. Coefficient of friction for steel on concrete at high normal stress [J]. Journal of Materials in Civil Engineering, 1990, 2(1): 46―49.
[19]  Kim S H, Mha H S, Lee S W. Effects of bearing damage upon seismic behaviors of a multi-span girder bridge [J]. Engineering Structures, 2006, 28(7): 1071―1080.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133