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International Journal of Structural Engineering (4 papers in press)
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In-Plane Vibration Characteristics of Isotropic Plate with Elastic Edge Restraints by Kavikant Mahapatra, S.K. Panigrahi Abstract: It has been well established that in-plane vibration modes in structures occur at high frequencies. Hence, it is important from the perspective of design consideration to analyze the dynamic behaviour of built up structures subjected to high frequency excitation. Also, in-plane vibration becomes important along with transverse vibration, when there is a dynamic interaction of transmission of both low and high frequency frequencies at connected junctions in a structure.
In light of the above, the present analysis has been undertaken for analysis of in-plane free vibration characteristics of isotropic rectangular plates with boundary conditions elastically restrained against expansion, compression and in-plane shear. The analysis has been carried out using single Fourier series solution for the in-plane plate displacements along with four auxiliary function (presented in form of the product of a single Fourier series expansion and one trigonometric function). The auxiliary function has been so chosen as to remove any potential discontinuities existing in the Fourier series displacement function defined over the entire x-y plane. Rayleigh-Ritz procedure has been applied to determine the in-plane natural frequencies of the plate and the unknown expansion coefficients. The use of expansion coefficients has been made to establish the in-plane mode shapes. The demonstrated numerical examples provide an excellent accuracy and convergence of resulting solutions and bring out the effects of variation of boundary conditions on the in-plane vibration characteristics. Keywords: In-plane Vibration; Elastic Edge Restraints; Fourier Series expansion; Rayleigh-Ritz Procedure; Trigonometric Function; Natural Frequency.
Evaluation of ultimate capacity of corrosion damaged reinforced concrete beam-columns using nonlinear sectional analysis by Amina Mohammed, Husham Almansour, Beatriz Martín-Pérez Abstract: A simplified nonlinear sectional analysis approach (NLSA) of aged reinforced concrete beam-columns based on numerical integration, enhanced inspection, material testing and/or empirical estimation of materials deterioration due to reinforcement corrosion is proposed. The proposed procedure is an iterative nonlinear technique that uses numerical integration of the sectional stresses and satisfies force equilibrium in every load increment step. The NLSA model incorporates corrosion-induced damage by reducing the steel cross section and ductility, removing the loss of concrete cover, and accounting for the loss of local bond in corrosion-damaged zones. Two case
studies are presented to estimate the effects of corrosion on the structural behaviour of reinforced concrete beam-columns by taking into account critical damage states. The model results show good agreement with test results, high numerical stability and consistent convergence for all examined loading cases. Keywords: nonlinear sectional analysis; NLSA; RC beam-column; reinforcement corrosion; assessment framework; aged bridge structure. DOI: 10.1504/IJSTRUCTE.2019.10022988
Numerical Study of the Behavior of Geosynthetic-Reinforced Soil Retaining Walls Under a Uniform Surcharge by Wafa Djebablah, Mohamed Salah Nouaouria, Souhila Adjabi Abstract: The geosynthetic technique of reinforcing retaining walls is one of the technics that is currently being developed in the field of geotechnics. This article focuses on a numerical study, using two-dimensional finite difference Fast Lagrangian Analysis of Continua FLAC2D software, to investigate the influence of a uniform surcharge application on the behavior of a geosynthetic-reinforced soil retaining wall, especially on the maximum tensile force and wall displacement at the end of construction. A parametric study was undertaken taking into account the surcharge load, the width and its distance from the continuous facing panel. The results show that the tensile forces in the reinforcement and the horizontal displacements of the facing panel increase with increasing the uniform surcharge. Furthermore, a small effect was noted on the maximum tensile force in the geosynthetic layers with varying the surcharge distance from the back of the facing panel. Keywords: Geosynthetic; retaining wall; surcharge; facing panel; Itasca; FLAC2D.
Numerical Study on the Behaviour of End-Plate Beam-to-Column Connections Under Lateral Impact Loading by Ali Al-Rifaie, Alaa Al-Husainy, Hayder Shanbara Abstract: An extended study on the lateral impact response of end-plate beam-column connections is presented in this paper. A parametric study is presented based on validated finite element models that were built in the companion paper that investigates the behaviour of two types of connections named flush plate connection (FPC) and partial depth end-plate connection (PDEPC) under quasi-static and lateral impact loadings. It was demonstrated that the specimens subjected to quasi-static and lateral impact loading exhibited similar modes of failure. Maximum Dynamic Increase Factor (DIF)s of 1.38 and 1.45 were also proposed based on the results of experimental tests and numerical analysis, respectively. In the current study, the FE models were validated against additional two specimens tested with thick plates under lateral impact loading to raise the accuracy of the models. Using the validated models, different parameters were investigated such as the effect of mass and velocity, number of bolts, projectile shape and boundary conditions. Moreover, the study was extended to predict the lateral impact response of another type of connections named extended end-plate connection. The numerical results manifested that using thick end-plate is unfavourable to resist the lateral impact loading. Also, it was found that the impact capacity of connection is enhanced with a higher velocity and a lighter mass. Moreover, the deformation mode is not influenced by changing the projectile configuration or the boundary conditions. Keywords: Lateral impact loading, End-plate, Beam column connections and Finite Element
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