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浙江大学学报(工学版)
J4  2012, Vol. 46 Issue (9): 1625-1632    DOI: 10.3785/j.issn.1008-973X.2012.09.012
土木工程     
预应力管桩焊接缝对桩基完整性检测的影响
王奎华,王宁,吴文兵
浙江大学 软弱土与环境土工教育部重点实验室,浙江 杭州 310058
Influence of weld on integrity testing of prestressed pipe piles
WANG Kui-hua, WANG Ning, WU Wen-bing
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University, Hangzhou 310058, China
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摘要：

焊接混凝土管桩做无损检测时,桩体连接处普遍存在较强的反射信号,而传统的刚度传递模型不能很好地反映这一现象.为此,提出一种模拟管桩焊接缝的简化模型.该模型将焊接缝看作无延时的弹簧系统,弹簧系统刚度是焊接深度和焊缝高度的函数.应用该模型对非均质土中多级预应力混凝土管桩的纵向振动特性进行研究,并得到了半正弦简谐激振力作用下的桩顶刚度、速度等动力响应的半解析解.分析了焊接深度和焊缝高度等因素对桩顶动力响应的影响,发现焊接深度对桩体连接处的反射信号影响明显.两组典型缺陷桩的实测拟合结果表明：该焊缝模型能很好地反映焊接缝处的反射信号,弥补了现有理论的不足.
Abstract:

Nondestructive testing to welded concrete tubular pile demonstrates that more distinct reflected signals exist at the junctions. The traditional stiffness transfer model cannot give a rational explain for this phenomenon. So a simplified model of weld joint for pipe pile was presented. The weld joint in this model is viewed as a spring without time-delay, the stiffness of which is a function of the depth and height of weld. The longitudinal vibration performance of the spliced prestressed concrete pipe pile in inhomogeneous soil was studied and a semi-analytical solution of stiffness and admittance on the pile head under half sine harmonic excitation was obtained using the presented model. The influence of the depth and height of weld on the dynamic response of the pile head was also given. It is found that the reflection at the weld joint will be affected significantly by the depth of the weld. In addition, the fitting results of the field measurement for two typically defective piles show that the presented model can simulate well the reflection signals at the joint and overcome the limitation of the existing theories．
出版日期: 2012-09-01
:  TU 473.1  
基金资助:

国家自然科学基金资助项目（50879077）.
作者简介: 王奎华(1965-)，男，教授，博导，从事桩基动力学理论究.E-mail:zdwkh0618@zju.edu.cn
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引用本文:

王奎华,王宁,吴文兵. 预应力管桩焊接缝对桩基完整性检测的影响[J]. J4, 2012, 46(9): 1625-1632.

WANG Kui-hua, WANG Ning, WU Wen-bing. Influence of weld on integrity testing of prestressed pipe piles. J4, 2012, 46(9): 1625-1632.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2012.09.012    或    http://www.zjujournals.com/eng/CN/Y2012/V46/I9/1625

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