First Principles Variational Formulation and Analytical Solutions for Third Order Shear Deformable Beams with Simple Supports using Fourier Series Method.

Ike, Charles Chinwuba; Mama, Benjamin Okwudili; Oguaghamba, Onyedikachi Aloysius

The Fourier series method for solving bending problems of third order shear deformable beams (TSBD) is presented in this paper. The theory accounts for transverse shear deformation and is suitable for moderately thick beams. Transverse shear stress free conditions are valid at the beam surfaces for TSDB. The field equations are two coupled ordinary differential equations in terms of two unknown displacement functions - transverse deflection w(x) and warping function φ(x). For simply supported ends considered, the loading and unknown functions w(x) and φ(x) are represented in Fourier series that satisfies the boundary conditions. The problem is reduced to a system of algebraic equations in terms of the Fourier coefficients wn and φn, which is solved to obtain wn and φn. Axial and transverse displacements fields, axial bending stress σxx and transverse shear stress τxz are then determined for the cases of point load at midspan, uniformly and linearly distributed loads over the span. The results are identical with previous results obtained by other scholars who used Ritz variational methods and other mathematical tools. For moderately thick beams under uniform load with l/h = 4, results obtained for σxx is 0.516% greater than the exact result by Timoshenko and Goodier while for thick beams under uniform load with l/h = 2, the result for σxx is 1.96% greater than the exact result by Timoshenko and Goodier. Similar acceptable variation was obtained for σxx for beams under linearly distributed load with the variations being less than 2% for l/h = 2. However, unacceptable variations of 68.37% were found for σxx in thick beams under point load, for l/h = 2.0. The variation for σxx however reduced to 12.513% for moderately thick beams under point load for l/h =4.

ORDINARY differential equations; SHEAR (Mechanics); FOURIER series; SEPARATION of variables; AXIAL stresses

Journal of Civil Engineering Frontiers (JoCEF), 2024, Vol 5, Issue 2, p55

2709-6904

Academic Journal

10.38094/jocef50286