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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2009, Vol. 28 ›› Issue (2): 161-167.DOI: 10.3969/j.issn.1674-0696.2009.02.01

• •    下一篇

独柱双层高架桥墩柱振动台试验研究??I: 结构动力特性

彭凯1,2,李建中1,朱宇3,彭天波1   

  1. 1.同济大学桥梁工程系,上海200092;2.重庆交通大学土木建筑学院,重庆400074; 3.安徽省交通规划设计研究院,安徽合肥230031
  • 收稿日期:2009-12-29 出版日期:2009-04-15 发布日期:2015-04-15
  • 作者简介:彭凯(1974—),男,重庆市人,副教授,博士研究生,主要研究方向是:桥梁与结构抗震、结构防灾减灾与加固等。
  • 基金资助:
    国家自然科学基金资助项目(50578118,50578168)

Shaking Table Tests on a Single-Column-Bent Double-Deck Viaduct-I Pier Model： Structural Dynamic Properties

PENG Kai1, 2, LI Jian-zhong1, ZHU Yu3, PENG Tian-bo1   

  1. 1. Department of Bridge Engineering, Tongji University, Shanghai 200092, China; 2. School of Civil Engineering ＆ Arehiteeture, Chongqing Jiaotong University, Chongqing 400074, China; 3. Anhui Communications Consulting ＆ Design Institute, Anhui Hefei 230031, China
  • Received:2009-12-29 Online:2009-04-15 Published:2015-04-15

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摘要： 对独柱双层高架桥墩模型进行了振动台试验,测试和分析了结构水平向动力特性,结果表明:独柱双层高架 桥在纵向和横向的对应阶振型形状相似、振型顺序相同;仅取基本振型不足以表征结构主要动力特性;结构高阶振 型频率对墩身中上部集中质量的变化较为敏感;墩柱截面开裂会明显降低结构自振频率、增大振型阻尼比,但对结 构振型形状和振型顺序影响不大;在偏低的激励强度和振型幅值条件下进行动力特性测试,结构经历强震后的真 实损伤状况无法得到准确反映。

关键词: 独柱双层高架桥, 振动台试验, 动力特性, 高阶振型

Abstract: Shaking?table?tests?were?done?on?a?single-column-bent?double-deck?viaduct?pier?model?with?horizontal?structural?dynamic?properties?acquired?and?analyzed,?which?indicated?that：the?structure?has?similar?mode?shapes?and?identical?mode?sequence?between?corresponding?vibration?modes?in?longitudinal?and?transverse?directions;?the?basic?vibration?mode?alone?is?insufficient?to?account?for?the?main?horizontal?structural?dynamic?properties;?the?higher-order?modal?frequencies?are?sensitive?to?the?change?of?lumped?mass?change?at?the?single?column＇s?upper?part?;?cracking?of?the?single?column?markedly?lowers?down?horizontal?structural?modal?frequencies?and?increases?modal?damping,?but?little?influences?mode?shapes?and?mode?sequences;?in?the?cases?of?relatively?low-intensity?stimulation?and?small-amplitude?vibration,?modal?tests?could?hardly?reflect?the?structural?damage?condition?after?serious?seismic?attack.

Key words: single-column-bent double-deck viaduct , shaking table test , dynamic properties , higher-order vibration modes ;

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