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Earthquakes and Structures
  Volume 5, Number 4, October 2013, pages 417-438
DOI: http://dx.doi.org/10.12989/eas.2013.5.4.417
 


Seismic strain analysis of buried pipelines in a fault zone using hybrid FEM-ANN approach
Seyed Kazem Sadat Shokouhi, Azam Dolatshah and Ehsan Ghobakhloo

 
Abstract
    This study was concerned on the application of a hybrid approach for analyzing the buried pipelines deformations subjected to earthquakes. Nonlinear time-history analysis of Finite Element (FE) model of buried pipelines, which was modeled using laboratory data, has been performed via selected earthquakes. In order to verify the FE model with experiments, a statistical test was done which demonstrated a good conformity. Then, the FE model was developed and the optimum intersection angle of pipeline and fault was obtained via genetic algorithm. Transient seismic strain of buried pipeline in the optimum intersection angle of pipeline and fault was investigated considering the pipes diameter, the distance of pipes from fault, the soil friction angles and seismic response duration of buried pipelines. Also, a two-layer perceptron Artificial Neural Network (ANN) was trained using results of FE model, and a nonlinear relationship was obtained to predict the bending strain of buried pipelines based on the pipes diameter, intersection angles of the pipelines and fault, the soil friction angles, distance of pipes from the fault, and seismic response duration; whereas it contains a wide range of initial input data without any requirement to laboratory measurements.
 
Key Words
    seismic strain analysis; buried pipelines; finite element method (FEM); genetic algorithm (GA); artificial neural network (ANN)
 
Address
Seyed Kazem Sadat Shokouhi: Department of Civil Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran
Azam Dolatshah:Department of Civil Engineering, Islamic Azad University, Dezful Branch, Dezful, Iran
Ehsan Ghobakhloo: Department of Civil Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran
 

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