渡槽桩-土-槽墩相互作用模型模态实验研究
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摘要
通过采用自制的传感器布设装置,把加速度传感器放入钢管桩内,采用子结构技术把结构分为两个子结构,对打入实际土层的钢管桩进行了横向位移模态的测试,同时,对槽墩也进行了模态测试实验。实验结果表明槽墩与桩有着相同的自振频率,并且组合形成了桩-槽墩系统振动模态。采用大型通用有限元软件ABAQUS进行了桩-槽墩系统的自振特性分析,有限元计算中对桩-土相互作用采用了简化模拟的方法,计算结果与试验结果基本吻合;并同刚性地基模型进行比较,其结果显示,在渡槽的设计中不能忽略桩-土相互的作用。
A new Self-made device was used.With it,acceleration sensors were put into a steel pipe pile for modal tests.Substructure technique was used and an aqueduct structure was divided into two substructures,one was the steel pipe pile knocked into soil,and the other was the pier.Modal tests were conducted for both of them.Test results showed that the pier and the pile have the same natural frequencies,they were combined to form vibration modes of the pile-soil-pier system.A finite element model for this system was established and analyzed with ABAQUS.The results were consistent with the test results.Compared with the rigid foundation model,the results indicated that the pile-soil interaction can not be ignored in design of an aqueduct.
A new Self-made device was used.With it,acceleration sensors were put into a steel pipe pile for modal tests.Substructure technique was used and an aqueduct structure was divided into two substructures,one was the steel pipe pile knocked into soil,and the other was the pier.Modal tests were conducted for both of them.Test results showed that the pier and the pile have the same natural frequencies,they were combined to form vibration modes of the pile-soil-pier system.A finite element model for this system was established and analyzed with ABAQUS.The results were consistent with the test results.Compared with the rigid foundation model,the results indicated that the pile-soil interaction can not be ignored in design of an aqueduct.
引文
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[2]李正农,孟吉复.多槽体渡槽的自振特性分析[J].武汉大学学报(工学版),2001,34(4):11-16.
[3]赵伟封.桩-土动力体系的模型试验及动力特性计算[J].西安公路学院学报,1993,13(2):23-30.
[4]周云,易伟建.考虑土-结构动力相互作用的框架结构的参数识别研究[J].土木工程学报,2007,40(6):14-19.
[5]王博,徐建国.大型渡槽考虑土-结构相互作用的动力分析[J].世界地震工程,2000,16(3):110-115.
[6]杨世浩,李正农,郑明艳.南水北调工程洺河渡槽耦合动力分析[J].湖南大学学报(自然科学版),2007,34(12):15-19.
[7]李德葆,陆秋海.实验模态分析及应用[M].北京:科学出版社,2001.
[8]戴恩彬,任伟新.湛江海湾大桥环境振动实验与模态分析[J].中国水运,2009,9(11):167-169.
[9]张爱林,王冬梅,刘学春,等.2008奥运会羽毛球馆弦支穹顶结构模型动力特性试验及理论分析[J].建筑结构学报,2007,28(6):68-75.
[10]Bouhaddi N,Lombard J P.Improved free-interfacesubstructures representation method[J].Computers andStructures,2000,77:269-283.
[11]Kim D K,Lee M S,Han J H.Substructure synthesis methodfor a nonlinear structure with a sliding mode condition[J].Journal of Sound and Vibration,2009,321:704-720.
[12]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.
[13]李正农,张盼盼,朱旭鹏,等.考虑桩-土动力相互作用的渡槽结构水平地震响应分析[J].土木工程学报,2010,43(12):137-143.
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