Wave field features of shallow vertical discontinuity and their application in non-destructive detection

Liu, Jiangping; Xia, Jianghai; Luo, Yinhe; Chen, Chao; Li, Xiuzhong; Huang, Yongqin

doi:10.1016/j.jappgeo.2006.12.001

Cited by 1 publication

(1 citation statement)

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“…The main features of the methodology were static excitation of the dam, displacement monitoring by radar device and identification of the unknown Young's modulus in pre-defined homogeneous zones through a batch of the least-squares method. Other researchers investigated wave field features of a shallow, vertical discontinuity and their application in non-destructive detection (Liu et al, 2007). The objective was to address the kinematical analysis of a vertical discontinuity, determine the resulting wave field characteristics, and provide the basis for determining the existence of vertical discontinuities based on the recorded signals.…”

Section: Introductionmentioning

confidence: 99%

Crack detection in concrete gravity dams using a genetic algorithm

Rezaiee‐Pajand¹,

Tavakoli²

2015

Proceedings of the Institution of Civil Engineers - Structures

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The main aim of this paper is to introduce an efficient procedure for crack detection in concrete gravity dams. A genetic algorithm and finite-element modelling are employed to perform the optimisation tasks. A two-dimensional cracked element is formulated for non-linear analysis. In this investigation, the kinematics of the discontinuous displacement field in a body with an internal discontinuity is utilised. Based on the suggested interpolation functions for the discrete segments, and also the element displacement field, the element stiffness matrix is calculated.Moreover, a genetic algorithm approach for crack identification is proposed, which can identify the location and magnitude of cracks in concrete gravity dams. By minimising the difference between the analytical responses given by the authors' element and the measured ones, the genetic algorithm identifies the crack. Finally, several numerical examples are analysed for the accuracy test and a few of them are presented here.

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Section: Introductionmentioning

confidence: 99%