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Structural Engineering and Mechanics Volume 55, Number 2, July25 2015 , pages 435-459 DOI: https://doi.org/10.12989/sem.2015.55.2.435 |
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Parametric resonance of composite skew plate under non-uniform in-plane loading |
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Rajesh Kumar, Abhinav Kumar and Sarat Kumar Panda
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| Abstract | ||
| Parametric resonance of shear deformable composite skew plates subjected to non-uniform (parabolic) and linearly varying periodic edge loading is studied for different boundary conditions. The skew plate structural model is based on higher order shear deformation theory (HSDT), which accurately predicts the numerical results for thick skew plate. The total energy functional is derived for the skew plates from total potential energy and kinetic energy of the plate. The strain energy which is the part of total potential energy contains membrane energy, bending energy, additional bending energy due to additional change in curvature and shear energy due to shear deformation, respectively. The total energy functional is solved using Rayleigh-Ritz method in conjunction with boundary characteristics orthonormal polynomials (BCOPs) functions. The orthonormal polynomials are generated for unit square domain using Gram-Schmidt orthogonalization process. Bolotin method is followed to obtain the boundaries of parametric resonance region with higher order approximation. These boundaries are traced by the periodic solution of Mathieu-Hill equations with period T and 2T. Effect of various parameters like skew angle, span-tothickness ratio, aspect ratio, boundary conditions, static load factor on parametric resonance of skew plate have been investigated. The investigation also includes influence of different types of linearly varying loading and parabolically varying bi-axial loading. | ||
| Key Words | ||
| skew plate; BCOPs, parametric resonance; non-uniform in-plane loading; dynamic instability | ||
| Address | ||
| Rajesh Kumar: Department of Civil Engineering, Indian Institute of Technology Kharagpur, India Abhinav Kumar and Sarat Kumar Panda: Department of Civil Engineering, Indian School of Mines Dhanbad, India | ||