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Frequencies of Lock Gate Structure Coupled with Reservoir Fluid

Sound & Vibration 2020年第3期54卷 179-200页

作者： priyaranjan pal Motilal Nehru National Institute of Technology Allahabad Prayagraj211004India

This study determines the natural frequencies of the lock gate structure,considering the coupled effect of reservoir fluid on one side using the finite element method(FEM).The gate is assumed to be a uniformly thick plate,and its material is isotropic,homogeneous,and *** reservoir fluid is assumed to be inviscid and incompressible in an irrotational flow *** length of the reservoir domain is truncated using the far boundary condition by adopting the Fourier series expansion *** different assumptions on the free surface,i.e.,undisturbed and linearized,are considered in the fluid domain *** computer code is written based on the developed finite element *** natural frequencies of the lock gate are computed when interacting with and without reservoir *** numerical problems are studied considering the effects of boundary conditions,aspect ratios,and varying dimensions of the gate and the fluid *** frequencies of gate reduce significantly due to the presence of *** frequencies increase when the fluid extends to either side of the *** frequencies reduce when the depth of the fluid domain above the top edge of the gate *** frequencies drop considerably when the free surface condition is taken into *** results of frequencies of lock gate structure may be useful to the designer if it is experienced in natural catastrophes.

关键词： Lock gate reservoir fluid fluid-structure interaction frequency HSDT FEM

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Free Vibration Analysis of RC Box-Girder Bridges Using FEM

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Sound & Vibration 2022年第2期56卷 105-125页

作者： Preeti Agarwal priyaranjan pal Pradeep Kumar Mehta Motilal Nehru National Institute of Technology Allahabad Prayagraj211004India

The free vibration analysis of simply supported box-girder bridges is carried out using the finite element *** fundamental frequency is determined in straight,skew,curved and skew-curved box-girder *** is important to analyse the combined effect of skewness and curvature because skew-curved box-girder bridge behaviour cannot be predicted by simply adding the individual effects of skewness and *** first,an existing model is considered to validate the present approach.A convergence study is carried out to decide the mesh size in the finite element *** exhaustive parametric study is conducted to determine the fundamental frequency of box-girder bridges with varying skew angle,curve angle,span,span-depth ratio and cell *** skew angle is varied from 0°to 60°,curve angle is varied from 0°to 60°,span is changed from 25 to 50 m,span-depth ratio is varied from 10 to 16,and single cell&double cell are used in the present study.A total of 420 bridge models are used for parametric study in the *** shapes of the skew-curved bridge are also *** fundamental frequency of the skew-curved box-girder bridge is found to be more than the straight bridge,so,the skew-curved box-girder bridge is *** present study may be useful in the design of box-girder bridges.

关键词： Fundamental frequency skew-curved box-girder bridge single-cell double-cell curve angle skew angle FEM

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