Volume 16, Issue 10 (1-2017)                   Modares Mechanical Engineering 2017, 16(10): 207-217 | Back to browse issues page

XML Persian Abstract Print

Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Pirboudaghi S, Tarinejad R, Alami M T. 2D Seismic Cracking Identification of Weighted Concrete Dams Based on Extended Finite Element Method and Wavelet Transform. Modares Mechanical Engineering 2017; 16 (10) :207-217
URL: http://mme.modares.ac.ir/article-15-1430-en.html
1- University of Tabriz
2- University of Tabriz/ Vice chancellor
Abstract:   (4500 Views)
In the current study, seismic cracking identification of concrete dams is conducted based on extended finite element method (XFEM) and Wavelet (WT) transform. First, the dam is numerically modeled and analyzed using the finite element method (FEM). Then cracking capability to the dam structure is added by applying the XFEM without introducing the initial crack, and the dam is analyzed under the seismic excitation. In fact, the whole dam structure is potentially under damage risk, and any zone reaching the fracture limit, begins to crack, which grows in the structure. This crack is usually unpredictable and is not easy to detect, therefore the structural modal parameters and their variation should be investigated based on structure response by using time-frequency transform. Results show that, investigating time-frequency window of the structure response and model parameters obtained from the numerical model, the history of physical changes occurred in the structure, cracking initiation time and damage localization is performed from comparing the intact and damaged vibration modes. Moreover, investigating the first natural modal indices of the intact and damaged structure, damage initiation and its location on Koyna dam height is easily detected, while for the second indices it is not performable.
Full-Text [PDF 8909 kb]   (6022 Downloads)    
Article Type: Research Article | Subject: Finite Elements Method
Received: 2016/05/31 | Accepted: 2016/09/3 | Published: 2016/10/15

Add your comments about this article : Your username or Email:

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.