Buckling of a Timoshenko beam bonded to an elastic half-plane: Effects of sharp and smooth beam edges

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:185

Article

Falope, F. O.^1,3  Lanzoni, L.^1,3,4  Radi, E.^2,3,4 

[1] Univ Modena & Reggio Emilia, DIEF, Via P Vivarelli 10, I-41125 Modena, Italy

[2] Univ Modena & Reggio Emilia, Dipartimento Sci & Metodi Ingn, DISMI, Via G Amendola 2, I-42122 Reggio Emilia, Italy

[3] CRICT Ctr Interdipartimentale Ric & & Serv Settor, Via P Vivarelli 10, I-41125 Modena, Italy

[4] Ctr Interdipartimentale En&Tech, Via G Amendola 2, I-42122 Reggio Emilia, Italy

关键词: Buckling load;    Elastic half-plane;    Edge effects;    Timoshenko beam;    Frictionless contact;    Chebyshev polynomials;   

DOI  :  10.1016/j.ijsolstr.2019.08.034

来源: Elsevier

【 摘 要 】

The problem of a compressed Timoshenko beam of finite length in frictionless and bilateral contact with an elastic half-plane is investigated here. The problem formulation leads to an integro-differential equation which can be transformed into an algebraic system by expanding the rotation of the beam cross sections in series of Chebyshev polynomials. An eigenvalue problem is then obtained, whose solution provides the buckling loads of the beam and, in turn, the corresponding buckling mode shapes. Beams with sharp or smooth edges are considered in detail, founding relevant differences. In particular, it is shown that beams with smooth edges cannot exhibit a rigid-body buckling mode. A limit value of the soil compliance is found for beam with sharp edges, below which an analytic buckling load formula is provided without loss of reliability. Finally, in agreement with the Galin solution for the rigid flat punch on a half-plane, a simple relation between the half-plane elastic modulus and the Winkler soil constant is found. Thus, a straightforward formula predicting the buckling loads of stiff beams resting on compliant substrates is proposed. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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