Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : beam

Proposed Design Against High-Cycle Fatigue Failure of Metallic Beams Using Lamination

Engineering and Technology Journal, 2018, Volume 36, Issue 5A, Pages 574-581
DOI: 10.30684/etj.36.5A.13

Fatigue analysis helps in predicting life of the component and seeks improvements of the whole process in design phase. Efforts are continually made to combat the fatigue phenomenon, yet certain mechanical components are still failing due to fatigue. The present work proposes a laminated design of beams, which undergo fatigue. The well-known Paris-Erdogan formula was used to theoretically predict fatigue life of the proposed design. The design was shown to enhance fatigue properties through laminating the cross section of the component; Barriers in front of a propagating crack is deliberately included by lamination. Spectacular levels of improvement in the fatigue life of up to 102% were achieved by replacing the monolithic type by only seven laminates. The present analysis was proved efficient in verifying the anticipated improvement acquired by the proposed design of laminated beams.

A Neural Network Model to Predict Ultimate Strength of Rectangular Concrete Filled Steel Tube Beam – Columns

Ahmed Sagban Saadoon; Kadhim Zuboon Nasser; Ihsan Qasim Mohamed

Engineering and Technology Journal, 2012, Volume 30, Issue 19, Pages 3328-3340

In this study, a model for predicting the ultimate strength of rectangular
concrete filled steel tube (RCFST) beam-columns under eccentric axial loads has
been developed using artificial neural networks (ANN). The available experimental
results for (111) specimens obtained from open literature were used to build the
proposed model. The predicted strengths obtained from the proposed ANN model
were compared with the experimental values and with unfactored design strengths
predicted using the design procedure specified in the AISC and Eurocode 4 for
RCFST beam-columns. Results showed that the predicted values by the proposed
ANN model were very close to the experimental values and were more accurate
than the AISC and Eurocode 4 values. As a result, ANN provided an efficient
alternative method in predicting the ultimate strength of RCFST beam-columns.

Upgrading Two Dimensional Search Radar to Three Dimensional Search Radar Based on SDR

H.T. Ziboon

Engineering and Technology Journal, 2010, Volume 28, Issue 18, Pages 5757-5770

This paper presents an exploitation of the existing two dimensional radars
(2D) which have two identical antennas for reception to be upgraded to a three
dimensional radar (3D) in order to measure the height as well as the slant range
and azimuth direction. The height measurement is important for preliminary
information for reducing the time required for acquisition. Software Defined
Radio (SDR) is chosen for the implementation of height finder processor is given
in this paper. Design parameters are selected for the proposed height finder
processor in order to accommodate SDR requirement. This work is also concerned
with the analysis of the parameters which affect the accuracy of height finding.
These parameters include the refraction index, smooth surface reflection,
divergence and rough surface reflection. The results of the analysis show the
feasibility of this proposal to upgrade the 2D to 3D radars

Shear Capacity of High-Strength Fiber Reinforced Concrete Beam-Column Joints

Kaiss Sarsam; Zaid Muhammad Kani Al-Azzawi

Engineering and Technology Journal, 2010, Volume 28, Issue 6, Pages 1253-1266

This work examines the work of 13 high-strength concrete (HSC) beamcolumn
joints (BCJ)-with and without steel fibers. Several shear design methods
(with modification for fiber content, where applicable) were found to be
conservative within a range of the following variables: 1) concrete compressive
strength, 2) type and volume fraction of steel fibers, 3) content of hoops in the
joint, and 4) column axial load. The coefficient of variation (COV) of the ratio
of test strength to design strength (VTEST / VrDES) was found to be appreciably low
for two of the five existing safe design methods. A conservative design method,
which lowers the COV even further to a value of 7.8 percent, is proposed for HSC
joints, with and without steel fiber reinforcement