独柱双层高架桥墩柱振动台试验研究-Ⅰ:结构动力特性
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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。
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.
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.
引文
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[2]Zayati F,Mahin S A.Experimental and analytical evalua-tion of a retrofit double-deck viaduct structure[R].Berkeley:Department of Civil Engineering of Universityof California,1996.
[3]彭天波,李建中,胡世德,等.双层高架桥的抗震性能[J].同济大学学报,2004,32(10):1355-1359.
[4]彭天波,李建中,胡世德,等.上海市共和新路双层高架桥的抗震试验研究[J].结构工程师,2004,32(10):39-43.
[5]彭凯,李建中,范立础.高墩梁桥考虑墩身高阶振动的水平向主导振型[J].振动与冲击,2008,27(7):62-67.
[6]JTJ 004—89,公路工程抗震设计规范[S].
[7]GB 50111—2006,铁路工程抗震设计规范[S].
[8]朱伯龙.结构抗震试验[M].北京:地震出版社,1989.
[9]Clough R W,Penzien J.Dynamics of Structures(3rdEdi-tion)[M].Berkley,California:Computers and Struc-tures,Inc.,2003.
[10]傅志方,华宏星.模态分析理论与应用[M].上海:上海交通大学出版社,2000.
[11]胡聿贤.地震工程学(2版)[M].北京:地震出版社,2006.
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