Research Papers/Topics in Structural Engineering

Non linear analysis using ADINA software

Linear analysis mostly applies to the problems that satisfy linear assumptions, materially linear problems that will have less displacements, less deformations, and boundary conditions which is constant. If any one of the above assumptions is not satisfied, a nonlinear analysis will have to be performed. ADINA Structures will provide powerful solving capacity and formulations which allows the solution of extremely complicated models with small CPU time and other memory requirements.

Models For Predicting the Structural Characteristics of Sand-Quarry Dust Blocks

ABSTRACT In this work, models for predicting six structural characteristics and cost of sand-quarry dust blocks were developed. Three model equations namely Scheffe’s simplex lattice design (pseudo component), Scheffe’s simplex lattice design (component proportion) and Osadebe’s model were developed for each property. The properties investigated were Compressive strength, Water absorption and Split tensile strength. The others are Static modulus of elasticity, Flexural strength and She...

Application of UBC and IBC Seismic Codes For R.C. Buildings Design in Sudan

ABSTRACT  This research dealt with the investigation of possibility of the use of the two representative seismic codes, UBC 1997, and IBC 2006, for seismic force analysis of R.C. buildings in Sudan. The theory of the seismic forces analysis was studied and presented. A R.C. building of eight storeys constructed in two sites, a very low seismic active site and a moderate seismic active site in Sudan which was analyzed by using ETABSv9.7.4 computer program. Utilizing data of the two sites, app...

Determination of Optimum Design Parameters of Non-linear Damped Outrigger System for High-rise Buildings

In addition to the inherent advantages of an outrigger system over conventional framed structural system, damped-outrigger systems (DOS) enhance it further with its agility to resist lateral loads in high-rise buildings. Dynamic response of slender and flexible buildings with DOS induces vibration control in which twisting of core structure is restricted by shear deformation of the damper present at the end of outrigger connected by perimeter columns. In this paper, a 300 m tall core-tube typ...

Analysis of Short Cylindrical Shell Under Internal Liquid Pressure Using Improved Finite Difference Method

ABSTRACT This research work presents the static analysis of short cylindrical shell under internal liquid pressure with various boundary conditions and aspect ratios. Improved fourth order finite difference method was employed for the analysis and a MATLAB computer program was developed based on the matrix equations and models generated from the analysis. The following boundary conditions were covered in this research; short circular cylindrical shell simply supported at both edges(s-s), sho...

Nanoparticle Delivery via Stocky SWCNTs, A Nonlinear-Nonlocal Continuum-based Scrutiny

Excellent mechanical properties plus to the good biocompatibility of single-walled carbon nanotubes (SWCNTs) are offering them as efficient nanodevices for delivering of nanoparticles. Due to the friction between the outer surface of the nanoparticle and the inner surface of the SWCNTs, mass weight of the nanoparticle, and the interactional van der Waals (vdW) forces between the constitutive atoms of the nanoparticle and those of the SWCNT, both longitudinal and transverse waves propagate wit...

On the Interaction of a Single-walled Carbon Nanotube with a Moving Nanoparticle Using Nonlocal Rayleigh, Timoshenko, and Higher-order Beam Theories

Interaction of a moving nanoparticle with a single-walled carbon nanotube (SWCNT) is of concern. The SWCNT is simulated by an equivalent continuum structure (ECS) under simply supported boundary conditions. The moving nanoparticle is modeled by a moving point load by considering its full inertial effects and Coulomb friction with the inner surface of the ECS. The ECS under the moving nanoparticle is modeled based on the Rayleigh, Timoshenko, and higher-order beam theories in the context of th...

Nonlocal Continuum-based Modeling of a Nanoplate Subjected to a Moving Nanoparticle. Part I, Theoretical Formulations

The potential applications of nano plates in energy storage, chemical and biological sensors, solar cells, field emission, and transporting of nano cars have been attracted the attentions of the nanotechnology community to them during recent years. Herein, the later application of nano plates from non local elastodynamic point of view is of interest. To this end, dynamic response of a nano plate subjected to a moving nano particle is examined with in the context of non local continuum theory ...

An Analysis Of Beams On Nonhomogeneous Elastic Foundation Using Initial Value Approach

ABSTRACT The paper presents an analysis of beams on non-homogeneous elastic foundation, where the deformation is partly localized and partly continuous. The soil was modeled to be in layers, in which two layers within the soil strata were considered. The different layers of the soil have their respective sub-grade modulus k, and the entire foundation is resting on a rigid base. The formulation was achieved by imbedding a beam of known bending rigidity within the layers of the foundation. The...

Structural Characteristics Of Soilcrete Blocks

ABSTRACT    This work investigates the structural characteristics of soilcrete blocks (lateritecement blocks and laterite-sand-cement blocks) produced with locally available and affordable laterite. Scheffe’s simplex method and Osadebe’s regression theory were used to formulate mathematical models for optimisation of properties of soilcrete blocks which include compressive strength, split tensile strength, shear strength, flexural strength, Poisson’s ratio, modulus of elasticity, shea...

Artificial Neural Network Model For The Prediction Of Elastic Modulus Of Concrete

ABSTRACT This research presents Artificial Neural Network Model for the prediction of the Modulus of Elasticity of Concrete. Egbulonu (2011) equation derived from Scheffe’s (4, 2) simplex equation for predicting the Modulus of Elasticity (MOE) was used to generate 800 values. These data represent different values of Modulus of Elasticity (MOE) out of which, 571 values were selected randomly by the artificial neural network. From the selected values, 400 were used for training the network,...

Application of a Direct Variational Principle in Elastic Stability Analysis of Thin Rectangular Flat Plates

ABSTRACT The purpose of this work is to use the energy approach in the form of direct variational principle (Rayleigh-Ritz method) for buckling analysis of thin rectangular plates with various boundary conditions using Taylor series shape functions. To do this, thin rectangular flat plate of various boundary conditions with three dimensions Ly, Lx and t was analyzed in this research. Ly and Lx are secondary and primary in-plane dimensions respectively and t is the plate thickness. The bou...