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Structural Engineering and Mechanics
  Volume 29, Number 1, May10 2008 , pages 77-89

Shear lag prediction in symmetrical laminated composite box beams using artificial neural network
Rajeev Chandak, Akhil Upadhyay and Pradeep Bhargava

    Presence of high degree of orthotropy enhances shear lag phenomenon in laminated composite box-beams and it persists till failure. In this paper three key parameters governing shear lag behavior of laminated composite box beams are identified and defined by simple expressions. Uniqueness of the identified key parameters is proved with the help of finite element method (FEM) based studies. In addition to this, for the sake of generalization of prediction of shear lag effect in symmetrical laminated composite box beams a feed forward back propagation neural network (BPNN) model is developed. The network is trained and tested using the data base generated by extensive FEM studies carried out for various b/D, b/tF, tF/tW and laminate configurations. An optimum network architecture has been established which can effectively learn the pattern. Computational efficiency of the developed ANN makes it suitable for use in optimum design of laminated composite box-beams.
Key Words
    laminated composites; shear lag; effective width ratio; finite element method; artificial neural networks.
Rajeev Chandak, Akhil Upadhyay and Pradeep Bhargava:
Dept. of Civil Engineering, Indian Institute of Technology, Roorkee, 247667, India

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