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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第7期    总第251期    2015年7月

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文章编号:1672-7207(2015)07-2549-09
高墩自复位隔震机理
夏修身1,陈兴冲1,李建中2

(1. 兰州交通大学 土木工程学院,甘肃 兰州,730070;
2. 同济大学 土木工程学院,上海,200092
)

摘 要: 为了探讨桩基础高墩自复位隔震机理,用2个弹簧模拟桥墩的提离摇摆,考虑限位钢筋的影响,基于某铁路高墩桥梁,采用非线性时程分析方法,输入3条强震记录,讨论高墩摇摆反应随提离弹簧刚度、基础宽度及参数λ变化的规律。研究结果表明:提离弹簧刚度越小桥墩的摇摆振动越剧烈、摇摆反应越大,墩顶位移随λ的增大而减小、有明显的线性关系,墩底弯矩随λ的变化相对复杂。通过基础宽度、λ及墩-承台的接触刚度调整均可以实现对桥墩摇摆反应的控制。

 

关键词: 高墩;桩基础;自复位;隔震机理;反应控制

Isolation mechanism of self-centering tall pier
XIA Xiushen1, CHEN Xingchong1, LI Jianzhong2

1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. College of Civil Engineering, Tongji University, Shanghai 200092, China

Abstract:The isolation mechanism for self-centring tall pier with pile foundations was investigated. Two springs were used to simulate the uplift and rocking of the pier. Rocking response of a railway tall pier was investigated through nonlinear time history analysis by inputting three strong ground motions, considering effects of restrainers on the rocking response. The rocking responses of the pier were discussed such as functions of the stiffness of up-lift spring and width of spreading foot. The results show that the rocking vibration is severe and rocking response of the piers is larger when the stiffness of lift-off spring is smaller. The base moment increases along with λ. The displacement at pier top decreases while λ increases. It is also observed that displacement at pier top has a linear relation with λ, but the relation between base moment and λ is relatively complicated. Rocking response of the tall pier can be controlled by adjusting the width of foundation, λ and the contact stiffness between the pier and the pile cap.

 

Key words: tall pier; pile foundation; self-centering; isolation mechanism; response control

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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