DERIVATION AND OPTIMIZATION OF DEFLECTION EQUATIONS FOR TAPERED CANTILEVER BEAMS USING THE FINITE ELEMENT METHOD

Authors

  • MM Ufe DEPARTMENT OF CIVIL ENGINEERING, UNIVERSITY OF AGRICULTURE, MAKURDI, BENUE STATE, NIGERIA
  • SN Apebo DEPARTMENT OF CIVIL ENGINEERING, UNIVERSITY OF AGRICULTURE, MAKURDI, BENUE STATE, NIGERIA
  • AY Iorliam DEPARTMENT OF CIVIL ENGINEERING, UNIVERSITY OF AGRICULTURE, MAKURDI, BENUE STATE, NIGERIA

Keywords:

Deflection, Finite element method, deterministic optimisation, numerical error, cantilever beam.

Abstract

This study derived analytical solutions for the deflection of a rectangular cross sectional uniformly tapered cantilever beam with varying configurations of width and breadth acting under an end point load. The deflection equations were derived using a numerical analysis method known as the finite element method. The verification of these analytical solutions was done by deterministic optimisation of the equations using the ModelCenter reliability analysis software and the Abaqus finite element modelling and optimisation software. The results obtained show that the best element type for the finite element analysis of a tapered cantilever beam acting under an end point load is the C3D20RH (A 20-node quadratic brick, hybrid element with linear pressure and reduced integration) beam element; it predicted an end displacement of 0.05035 m for the tapered width, constant height cantilever beam which was the closest value to the analytical optimum of 0.05352 m.  The little difference in the deflection value accounted for the numerical error which is inevitably present in the analyses of structural systems. It is recommended that detailed and accurate numerical analysis be adopted in the design of complex structural systems in order to ascertain the degree of uncertainty in design.

 

http://dx.doi.org/10.4314/njt.v39i2.5

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Published

2020-04-03

Issue

Vol. 39 No. 2 (2020): NIGERIAN JOURNAL OF TECHNOLOGY, VOL. 39, NO. 2, APRIL 2020

Section

Building, Civil & Geotechnical Engineering

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How to Cite

DERIVATION AND OPTIMIZATION OF DEFLECTION EQUATIONS FOR TAPERED CANTILEVER BEAMS USING THE FINITE ELEMENT METHOD. (2020). Nigerian Journal of Technology, 39(2), 351-362. https://nijotech.com/index.php/nijotech/article/view/2283