Emmanuel T. Olodo - Academia.edu (original) (raw)

Papers by Emmanuel T. Olodo

Modern Applied Science, Mar 30, 2020

In this work a numerical model is developed for vibration analysis of low folded shells under dyn... more In this work a numerical model is developed for vibration analysis of low folded shells under dynamic actions. At first it is done to describe the used finite element discrete model based on Lagrange variational principles. To solve the eigen value problem of these structures a numerical algorithm is proposed using Householder's QR-iteration transformations. This method provides a tridiagonal matrix whose eigen values coincide with those of the initial matrix and significantly reduces the iteration number compared to the Lanczos method. Implementation of the method is carried out on seven folded shell mathematical models. Obtained results show that accuracy can be improved and computational time can be significantly reduced compared to the methods available in the technical literature for this class of problems.

Modern Applied Science, Mar 13, 2019

This work is devoted to forced vibration numerical analysis of reticulate bar systems. The dynami... more This work is devoted to forced vibration numerical analysis of reticulate bar systems. The dynamic finite element method was used for determination of frequencies, displacement amplitudes, rotation angles and the dynamic effort factors. By this method the components of the dynamic rigidity matrix and inertia matrix depend on applied external excitation frequency. Obtained results are compared with those calculated by the classical finite element method as well as by analytical method. It is shown that the dynamic finite element allows for exact solutions to the problems in forced vibration of structures. Accuracy of dynamic finite element solution is verified through obtaining analytical solutions on simple systems. In case of complex systems where analytical calculations are complicated the dynamic finite element can become a universal tool for dynamic analysis.

Iranian Journal of Science and Technology-Transactions of Civil Engineering, Apr 24, 2023

Iranian Journal of Science and Technology-Transactions of Civil Engineering, Feb 25, 2023

Current Journal of Applied Science and Technology, May 13, 2020

Aims: This work is devoted to the development of a finite element algorithm for solving problem i... more Aims: This work is devoted to the development of a finite element algorithm for solving problem in forced vibrations of folded low shells. Methodology: The differential equations for harmonic analysis are obtained from the Lagrange variational principle. Description of the dynamic behavior is made by the structure discretization into a system of curvilinear iso-parametric finite elements used in modal analysis. The method is implemented by a calculation code on a square-plane folded shell model withnumber of crease edges in both directions k=l=3. Results: Displacement amplitudesare obtained by decomposition into vibration eigenforms. The maximum values of dynamic stresses are determined taking into account the shell's support conditions.The results of the harmonic analysis show thatimprovement in frequency characteristics and reduction of stresses in the folded shell depend on the constructive and internal damping of the structureand the increase in the number of fold edges k and l in both directions for examplebecause this contributes to decrease in the forced vibration amplitudes.

Modern Applied Science, Dec 27, 2017

One of the major concerns in designing of prestressed beams in ultra-high performance fiber-reinf... more One of the major concerns in designing of prestressed beams in ultra-high performance fiber-reinforced concrete (UHPFRC) is improvement of their ductility fracture due to the nature of the materials used in their manufacture. This can induce plastic behaviours which it is necessary to take into account by designing of such structures, especially when they are of large spans. In the present work, it is proposed an analytical model in large deformation of a rigid plastic prestressed UHPFRC beam embedded at one end and having at other end rolled support. She is approached by a local uniform load and external moments to supports. The proposed non-linear model can find exact analytical solutions for the determination of the local arrows and the associated charge by the technique of Lagrange multiplier which allows finding the stationary points of differentiable function of one or several variables under constraints. The results of this work can be useful in designing and calculation of long span prestressed structures with plastic rigid behavior.

Structural Engineering and Mechanics, Nov 10, 2014

For analysis of the plates and membranes by numerical or analytical methods, the question of choi... more For analysis of the plates and membranes by numerical or analytical methods, the question of choice of the system of functions satisfying the different boundary conditions remains a major challenge to address. It is to this issue that is dedicated this work based on an approach of choice of combinations of trigonometric functions, which are shape functions of a bended beam with the boundary conditions corresponding to the plate support mode. To do this, the shape functions of beam vibrations for strength analysis of the rectangular plates by Kantorovich-Vlasov`s method is considered. Using the properties of quasi-orthogonality of those functions allowed assessing to differential equation for every member of the series. Therefore it`s proposed some new forms of integration of the beam functions, in order to simplify the problem.

International journal of advanced research, Mar 31, 2021

The aim of thisscientificworkis to investigate the effect of moisture content on the behaviour of... more The aim of thisscientificworkis to investigate the effect of moisture content on the behaviour of borassus in concrete. At the beginning of thisstudy, characterisation tests are carried out on the materials used. These materials include Nokoue lagoonsand, rolledgravelfrom the Mono, concrete and cut-to-length rÃƒÂ´nier. Afterformulating the concrete using the DREUX - GORISSE method, the Borassus plant reinforcementsweretreated with a hydraulicwaterproofing binder (cement glue, bitumen and Flintkote Be3) and nine (09) beamswere made, three (03) per category of waterproofingtreatment. In addition, three (03) control beams are used as comparison materials. The analysis of all the results of the four-point bending tests led us to the conclusion that Flintkote Be3 and bitumen are very effective waterproofingproducts for the treatment of the surfaces of rÃƒÂ´nier wood beforethey are introducedinto the concrete, because the smaller the variation in the moisture content of the beams (example of PARB beam: 2.36%), the greater the resistancetheydevelop to the appliedload (example of PARB beam: 19.36 Ã‚Â± 1.84 kN) and consequently the lower the deformability of the beams. It thenappearsthatbitumen and Flintkote Be3 canthereforeact as a productthateliminates the dimensional variations of borassus reinforcements in concrete and provides good resistance of borassus-reinforced structures.

Construction and Building Materials, Apr 1, 2018

h i g h l i g h t s A process for recycling waste wood, polystyrene and plastics is proposed. The... more h i g h l i g h t s A process for recycling waste wood, polystyrene and plastics is proposed. The process is based on optimal formulations of polymers and composites. The values of the properties studied show that the polymers are compatible with sawdust. Composites can be used to produce panels and wood boards. Wood boards and panels can be used for building wood structures.

World Journal of Advanced Research and Reviews

Lateritic gravels are the most abundant road materials used in pavement foundations. With the sca... more Lateritic gravels are the most abundant road materials used in pavement foundations. With the scarcity of good quality materials, the recourse to lateritic gravels having weak technical characteristics, like the lateritic quarry of Avlamè Benin, is felt with the high price of stabilizers like cement, other methods must be explored in cooperation in order to reduce the cost of stabilization and, consequently, the cost of road construction and the risks related to the environmental pollution In this respect, it is imperative to determine the technical characteristics of the lateritic gravel of Avlamè improved with granitic crushed stone 0/31.5 for its use in the base course of flexible pavements. Thus, an experimental study on Avlamè lateritic gravel with different percentages of granitic crushed stone was carried out following the normative recommendations in road construction. This characterization allowed to highlight the technical properties of the lateritic gravel improved with g...

International Journal of Approximate Reasoning, 2021

International Journal of Structural Engineering, 2015

The aim of this work is relative to identification of modal characteristics of beam vibrations of... more The aim of this work is relative to identification of modal characteristics of beam vibrations of mono span bridge beams on seismic damping supports. This has necessitated the development of a method of calculation of span bridge beams on damping supports and solicited by loads seismic origin. To do this, firstly, the solution of governing differential equation of the movement is presented in form of Fourier, thus reducing it to two ordinary differential equations. Using Krylov's functions, one able to obtain on the one hand, analytical expressions for determining vibration modes depending on the rigidities of beam damping supports. On the other hand, it is the analytical relationship between frequencies of beam vibrations and the reports of damping support rigidities and those of beams. Obtained results could be useful to engineers and researchers involved in the study of girder bridge structures under stresses of seismic origin.

Current Journal of Applied Science and Technology

Aims: To determine the technical parameters sought in road engineering of the lateritic aggregate... more Aims: To determine the technical parameters sought in road engineering of the lateritic aggregate of Atchia village in the Arrondissement of Cana, Commune of Zogbodomey. Study Design: To valorize the lateritic aggregate of Cana-Atchia in the construction of roads in Benin. Place and Duration of Study: Colas Benin Entreprise Laboratory and Laboratory of Energetic and Applied Mechanic, Polytechnic School of Abomey-Calavi, University of Abomey-Calavi, Abomey-Calavi, between January 2021 and March 2022. Methodology: Thus, with the help of classical road material characterization tests, the values of technical road engineering parameters are determined on prepared specimens. Results: The different results obtained are the percentage of passings at the 80 µm sieve (13%), the liquidity limit (32.67%), the plasticity index (13.67%), the dry density obtained at the Proctor optimum (2.28t/m3), the CBR index (106%) and the swelling index (0.04%). In the Proctor test, the water content at the O...

Iranian Journal of Science and Technology, Transactions of Civil Engineering

Current Journal of Applied Science and Technology, 2020

Mathematical Models and Methods in Applied Sciences, 2020

Modern Applied Science