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浙江大学学报(工学版)
交通工程、土木工程     
传感器黏结剂对低应变测试曲线的影响
庾焱秋,王奎华,吕述晖,徐礼阁
浙江大学 软弱土与环境土工教育部重点实验室,浙江大学滨海和城市岩土工程研究中心,浙江 杭州 310058
Impact of accelerometer adhesive on low strain testing curves
YU Yan qiu, WANG Kui hua, LV Shu hui, XU Li ge
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Research Center of Coastal and Urban
Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
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摘要:

为了分析黏结剂对桩顶测试曲线的影响,考虑黏结剂自身的刚度和阻尼,建立黏结剂与传感器组成的双自由度系统振动模型.利用拉普拉斯变换,求得传感器振子和底座位移差的导纳函数.利用已知的桩顶速度响应函数、卷积定理以及傅里叶逆变换,求得正半弦脉冲激励作用下传感器电荷输出的半解析解.利用所得解,根据传感器电荷输出与桩顶速度响应的关系,分析黏结剂材料的刚度及阻尼对传感器输出电荷曲线及实测桩顶速度曲线的影响.结合完整桩和缩颈桩2个算例进一步分析黏结剂对桩顶测试曲线的影响,并将理论曲线与实测曲线进行对比.结果表明:所得理论解与实测速度的响应曲线一致,传感器黏结剂自身刚度和阻尼的减小均会大大增加桩身反射信号的判别难度.

Abstract:

A vibration model of the two degree  freedom system consisting of  accelerometer and adhesive was established to analyze the influence of the adhesive on the test curve at the top of pile, considering the stiffness and damping of the adhesive. An admittance function of the difference between the displacements of the accelerometer oscillator and base was analytically derived in Laplace transform space. A semi analytical solution was derived for the electric charge output of the accelerometer subjected to a semi sine wave exciting force, with the use of the already known velocity response function at the top of pile, the convolution theorem and the inverse Fourier transform. The obtained solutions  were used to analyze the influences of stiffness and damping of accelerometer adhesive on the relationship between the charge output of the accelerometer and the velocity response at the top of pile. Two examples were selected to further analyze the influences of accelerometer adhesive on velocity response curve at the top of pile: one was a intact pile, and the other was a defective pile. The theoretical results were also verified experimentally with  good agreement between the theoretical and the experimental velocity response curves. Both the decrease of coefficient of stiffness and damping of the adhesive would lead to great difficulty in distinguishing the reflection signal of pile.

出版日期: 2015-10-15
:  TU 473.1  
基金资助:

国家自然科学基金资助项目(51378464).

通讯作者: 王奎华,男,教授,博导. ORCID:0000 0002 9362 0326.     E-mail: zdwkh0618@zju.edu.cn
作者简介: 庾焱秋(1990-),女,硕士生,从事桩基动力学研究. ORCID:0000 0001 5804 3458. E-mail:laoyu0827@163.com
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引用本文:

庾焱秋,王奎华,吕述晖,徐礼阁. 传感器黏结剂对低应变测试曲线的影响[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008 973X.2015.09.015.

YU Yan qiu, WANG Kui hua, LV Shu hui, XU Li ge. Impact of accelerometer adhesive on low strain testing curves. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008 973X.2015.09.015.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008 973X.2015.09.015        http://www.zjujournals.com/eng/CN/Y2015/V49/I9/1725

[1] MAMOON S M, BANERJEE P K. Time domain analysis of dynamically loaded single piles [J]. Journal of  Engineering Mechanics, 2014,118 (1): 140-160.
[2] MILITANO G, RAJAPAKSE K N D. Dynamic response of a pile in a multi layered soil to transient torsionaland axial loading [J].Geotechnique, 1999, 49(1): 91-109.
[3] CHANG D W, YEH S. Time domain wave equationanalyses of single piles utilizing tansformed radiationdamping [J].Soils and Foundations, JGS, 1999, 39(2): 31-44.
[4] TALLAVO F, CASCANTE G, PANDEY M D. New methodology for source characterization in pulse velocity testing [J]. Geotechnical Testing Journal, 2009, 32(6): 537-552.
[5] YESILCE Y, CATAL H H. Free vibration of piles embedded in soil having different modulus of subgrade reaction [J]. Applied Mathematical, 2008,32(5):889-900.
[6] CHOW Y K, PHOON K K, CHOW W F, et al. Low strain integrity testing of piles: three dimensional effects[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2003,129(11):1057-1062.
[7] WANG T, WANG K H, XIE K H. An analytical solution to longitudinal vibration of a pile of arbitrary segments with vabiable modudlus [J]. Acta Mechanica Solida Sinica, 2001, 14(1):67-73.
[8] WANG K H, ZHANG Z Q, Chen J L, et al. Dynamic torsional response of an end bearing pile in saturated poroelastic medium[J]. Computers and Geotechnics,2008, 35:450-458.
[9] 胡学科,马少俊,王奎华.传感器安装位置对高应变打桩监测结果影响的研究[J].振动与冲击,2011,30(4):259-264.
HU Xue ke, MA Shao jun, WANG Kui hua. Influence of positions of sensor on results measured on a high strain pile [J]. Journal of Vibration and Shock, 2011,30(4):259-264.
[10] WANG K H, ZHANG Z Q, CHEN J L. Dynamic torsional response of an end bearing pile in transversely isotropic saturated soil [J]. Journal of Sound and Vibration, 2009, 327:440-453.
[11] YANG D Y, WANG K H. Study on vertical vibration of pile in radial inhomogeneous soil[C]∥ Structural Condition Assessment, Monitoring and Improvement.Changsha:[s.n.], 2007: 241-249.
[12] YANG D Y, WANG K H, ZHANG Z Q, et al. Vertical dynamic response of pile in a radially heterogeneous soil layer[J]. International Journal for Numerical and Analytical Method on Geomechanics, 2009,33(8):1039-1054.
[13] 王腾,王奎华,谢康和.成层土中桩的纵向振动理论研究及应用[J].土木工程学报,2002,35(1):83-87.
WANG Teng, WANG Kui hua, XIE Kang he.Study of theory of pile with variable sections and its application in layered soil[J].China Civil Engineering Journal, 2002,35(1):83-87.
[14] 杨冬英,王奎华,丁海平.三维非均质土中黏弹性桩 土纵向耦合振动响应[J].土木建筑与环境工程,2011,33(3):80-87.
YANG Dong ying, WANG Kui hua, DING Hai ping. Axial response of viscoelastic pile soil coupling interaction in three dimensional inhomogeneous soil [J]. Chinese Journal of Civil, Architecturaland Environmental Engineering, 2011,33(3):80-87.
[15] 周铁桥,王奎华,谢康和,等.轴对称径向非均质土中桩的纵向振动特性分析[J].岩土工程学报,2005,27(6):720-725.
ZHOU Tie qiao, WANG Kui hua, XIE Kang he, et al. Vertical vibration analysis of piles in radial heterogeneous soil [J]. Chinese Journal of Geotechnical Engineering, 2005,27(6):720-725.
[16] 王钻开,陆德仁. 传感器固有频率和阻尼对冲击加速度检测的影响[J]. 功能材料与器件学报,2003,9(2):161-164.
WANG Zuan kai, LU De ren, Effect of eigenfrequency and damping of the accelerometer on high g shock meadurement [J]. Chinese Journal of Functional Materials and Devices, 2003, 9(2):161-164.
[17] 陈晓东,李志远,陈世荣. 基桩动测系统中耦合剂的缩频作用分析[J].合肥工业大学学报:自然科学版.2000,23(4):522-524.
CHEN Xiao dong, LI Zhi yuan, CHEN Shi rong. Study on shorten frequency effect of couplers in dynamic testing system of piles [J]. Journal of Hefei University of Technology:Natural Science, 2000, 23(4):522-524.
[18] 刘习军,贾启芬. 工程振动理论与测试技术[ M ] . 北京: 高等教育出版社, 2006:25-39.

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