Engineering and Technology Journal

Elzaki Transform Method for Natural Frequency Analysis of Euler-Bernoulli Beams

Charles C. Ike; Tarig M. Elzaki

Volume 41, Issue 11 , November 2023, , Page 1274-1285

https://doi.org/10.30684/etj.2023.140211.1456

Abstract

Free vibration analysis of thin beams under dynamic excitation is important in design to prevent resonance failures that occur when the excitation frequency coincides with the natural ... Read More ...

ANSYS-Based Structural Analysis Study of Elevated Spherical Tank Exposed to Earthquake

Mahmoud Saleh Al-Khafaji; Ahlam S. Mohammed; Muna A. Salman

Volume 39, Issue 6 , June 2021, , Page 870-883

https://doi.org/10.30684/etj.v39i6.460

Abstract

Damage of elevated tanks during earthquakes can jeopardize the supply of drinking water and causes significant economic losses. Therefore, seismic analysis of tanks containing liquids ... Read More ...

Behavior of High-Rise Steel Building With The Inclusion of Warping

Najlaa H. Shareef; Haitham H.Muteb; Hisham M. AL-Hassani

Volume 28, Issue 22 , November 2010, , Page 6580-6601

https://doi.org/10.30684/etj.28.22.10

Abstract

The mathematical procedure in this study covers the calculation of sectorialproperties of the equivalent cross-sectional storey for high-rise building frames. Theformulation is efficiently ... Read More ... The mathematical procedure in this study covers the calculation of sectorialproperties of the equivalent cross-sectional storey for high-rise building frames. Theformulation is efficiently used to obtain the free vibration analysis of high-risebuildings which are constructed from several columns, beams, shear walls andbracing etc. the analysis is based on transformation the complex system to a simpletall column to represent a cantilevered tall building structure. This is partitioned tonodes one of which indicates a storey with equivalent cross-sectional properties forall storeys' elements after calculation of these properties with respect to the shearcenter of high-rise building. A thin walled bar finite element with seven degrees offreedom at each node is assumed. A new formulation of the stiffness and consistentmass matrices of the thin- walled element is presented in this study. The effect ofcross sectional warping and its properties on the flexural, torsional and axialproperties was investigated, using discrete element approach in idealizing thestructure in high rise building. For the purpose of the present study, it is assumedthat the cross-sectional types under condition are only of thin-walled sections.Algorithm method was developed which covers the calculation of sectorialproperties of the cross section for floor plan in high-rise building, to study the shareof columns for lateral shear force resistance, and investigate the behavior of differenttypes of high-rise building with inclusion of warping restraint. The effect of naturalfrequency with height of tall buildings, and the mode shape for different crosssectionalplans of high-rise building was studied. To check the efficiency andaccuracy, the mathematical procedure is demonstrated for static and dynamicexamples by comparing the results with those obtained by using software ANSYSprogram. A difference of 15% is shown. An eigen value problem is analyzed andnumerical examples are discussed.

Theoretical Analyses of the Dynamic Behaviour of Composite Cantilever Beam Manufactured From E-glass Polyester

Hayder Moasa Al-Shukri; Muhannad Z. Khelifa; Saad A. Khether

Volume 27, Issue 9 , June 2009, , Page 1833-1846

https://doi.org/10.30684/etj.27.9.14

Abstract

In order to have the right combination of manufactured E-glass polyestercomposite properties and in service performance, the dynamic behaviour is one of the important properties to ... Read More ...

Keywords = Natural frequencies

Elzaki Transform Method for Natural Frequency Analysis of Euler-Bernoulli Beams

Abstract

ANSYS-Based Structural Analysis Study of Elevated Spherical Tank Exposed to Earthquake

Abstract

Behavior of High-Rise Steel Building With The Inclusion of Warping

Abstract

Theoretical Analyses of the Dynamic Behaviour of Composite Cantilever Beam Manufactured From E-glass Polyester

Abstract