独柱双层高架桥墩柱振动台试验研究-Ⅰ:结构动力特性  

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

作　　者：彭凯[1,2] 李建中[1] 朱宇[3] 彭天波[1] 

机构地区：[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

出　　处：《重庆交通大学学报（自然科学版）》2009年第2期161-167,263,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金资助项目(50578118,50578168)

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。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.

关 键 词：独柱双层高架桥 振动台试验 动力特性 高阶振型 

分 类 号：TU352[建筑科学—结构工程]