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Steel and Composite Structures
  Volume 43, Number 2, April25 2022 , pages 229-240
DOI: https://doi.org/10.12989/scs.2022.43.2.229
 


Dynamic analysis by impact load in viscoelastic sandwich plates with FRP layer utilizing numerical method
Mohammad Reza Bayati, Hamid Mazaheri and Mahmood Rabani Bidgoli

 
Abstract
    The main objective of this work is presenting a mathematical model for the concrete slab with fiber reinforced polymer (FRP) layer under the impact load. Impacts are assumed to occur normally over the top slab and the interaction between the impactor and the structure is simulated using a new equivalent three-degree-of-freedom (TDOF) spring–mass–damper (SMD) model. The structure is assumed viscoelastic based on Kelvin-Voigt model. Based on the sinusoidal shear deformation theory (SSDT), energy method and Hamilton's principle, the motion equations are derived. Applying DQM, the dynamic deflection and contact force of the structure is calculated numerically so that the effects of mass, velocity and height of impactor, boundary conditions, FRP layer, structural damping and geometrical parameters of structure are shown on the dynamic deflection and contact force of system. Results show that considering structural damping leads to lower dynamic deflection and contact force. In addition, increasing the impact velocity of impactor yields to increases in the maximum contact force and deflection while the contact duration is decreased. The result shows that the contact force and the central deflection of the structure decreases and the contact time decreases with assuming FRP layer.
 
Key Words
    concrete slab with FRP layer; low velocity impact; numerical method; SSDT; viscoelastic
 
Address
Mohammad Reza Bayati:Department of Civil Engineering, Khomein Branch, Islamic Azad University, Khomein, Iran

Hamid Mazaheri:Department of Civil Engineering, Khomein Branch, Islamic Azad University, Khomein, Iran

Mahmood Rabani Bidgoli:1)Department of Civil Engineering, Khomein Branch, Islamic Azad University, Khomein, Iran
2)Department of Civil Engineering, Jasb Branch, Islamic Azad University, Jasb, Iran
 

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