Condition assessment of PC tendon duct filling by elastic wave velocity mapping.

Condition assessment of PC tendon duct filling by elastic wave velocity mapping.
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DOI:
10.1155/2014/194295
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发表时间:
2014
影响因子:
--
通讯作者:
Shiotani T
Shiotani T
中科院分区:
其他
文献类型:
--
作者:
Liu KF;Chai HK;Mehrabi N;Yoshikazu K;Shiotani T

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现代大型混凝土结构的无损检测对成像技术提出了更高的要求。走时层析成像(TTT)技术,这是基于映射的原理,瞬态弹性波的传播速度在被测对象的变化,已发现越来越多的应用评估在现场混凝土结构。该技术的主要目的是检测结构中存在的缺陷。TTT技术可以为预应力混凝土构件的筋道填充评价提供一种有效的手段。本研究的目的是澄清一些有关的问题,该技术的可靠性,为此目的,如传感器的安排,模型,网格,类型的腱鞘,鞘的厚度,材料类型以及规模的不均匀性。工作涉及二维模拟的波动,信号处理,以提取波的旅行时间,和断层重建计算的速度映射的缺陷在肌腱管道。
Imaging techniques are high in demand for modern nondestructive evaluation of large-scale concrete structures. The travel-time tomography (TTT) technique, which is based on the principle of mapping the change of propagation velocity of transient elastic waves in a measured object, has found increasing application for assessing in situ concrete structures. The primary aim of this technique is to detect defects that exist in a structure. The TTT technique can offer an effective means for assessing tendon duct filling of prestressed concrete (PC) elements. This study is aimed at clarifying some of the issues pertaining to the reliability of the technique for this purpose, such as sensor arrangement, model, meshing, type of tendon sheath, thickness of sheath, and material type as well as the scale of inhomogeneity. The work involved 2D simulations of wave motions, signal processing to extract travel time of waves, and tomography reconstruction computation for velocity mapping of defect in tendon duct.
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