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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 106
PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by:
Paper 197

Composite Bars subject to Uniform Torsion with Deformable Shear Connection using the Boundary Element Method

V.G. Mokos and E.J. Sapountzakis

Institute of Structural Analysis and Antiseismic Research, School of Civil Engineering, National Technical University of Athens, Greece

Full Bibliographic Reference for this paper
V.G. Mokos, E.J. Sapountzakis, "Composite Bars subject to Uniform Torsion with Deformable Shear Connection using the Boundary Element Method", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 197, 2014. doi:10.4203/ccp.106.197
Keywords: warping function, torsion constant, center of twist, deformable connection, slip, imperfect interfaces, boundary element method..

Summary
In engineering practice we often come across the analysis of rectilinear members of composite structures subjected to twisting moments. Curved bridges or beams subjected to eccentric loading with respect to their cross section's shear center are the most common examples. In composite structural members, where no distortion of the cross-section occurs, the connection is often flexible in shear permitting only the longitudinal relative slip but preserving the contact. In this paper, a boundary element method (BEM) is developed for the uniform torsion of composite bars with deformable shear connection of arbitrary constant cross section. The composite bar (thin or thick walled) consists of materials in contact, each of which can surround a finite number of inclusions. The materials have different elasticity and shear moduli and can slip in the longitudinal direction of the bar. The problem is analysed by assuming a "spring-type" imperfect bonding along the interfaces of the materials in contact. A boundary value problem is formulated with respect to corresponding torsional warping function and solved employing a pure BEM approach, that is only boundary discretization is used. Numerical examples are worked out to illustrate the efficiency, the accuracy and the range of applications of the method developed. The considerable influence of the longitudinal relative slip in both the torsional rigidity and the warping of the composite cross section of the bar are pointed out.

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