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Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   JANUARY 2017 , Volume 16 , Number 10 ; Page(s) 207 To 217.
 
Paper: 

2D SEISMIC CRACKING IDENTIFICATION OF CONCRETE GRAVITY DAMS BASED ON EXTENDED FINITE ELEMENT METHOD AND WAVELET TRANSFORM

 
 
Author(s):  PIRBOUDAGHI SAJJAD, TARINEJAD REZA*, AALAMI MOHAMMAD TAGHI
 
* FACULTY OF CIVIL ENGINEERING, UNIVERSITY OF TABRIZ, TABRIZ, IRAN
 
Abstract: 

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 timefrequency 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 done 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 natural frequency it is not true.

 
Keyword(s): CONCRETE DAM, STRUCTURAL HEALTH MONITORING, DAMAGE DETECTION, EXTENDED FINITE ELEMENT METHOD, TIME-FREQUENCY TRANSFORM
 
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