DOI: https://doi.org/10.9744/ced.20.2.70-77

Displacement and Stress Function-based Linear and Quadratic Triangular Elements for Saint-Venant Torsional Problems

Joko Purnomo, Wong Foek Tjong, Wijaya W.C., Putra J.S.

Abstract


Torsional problems commonly arise in frame structural members subjected to unsym­metrical loading. Saint-Venant proposed a semi inverse method to develop the exact theory of torsional bars of general cross sections. However, the solution to the problem using an analytical method for a complicated cross section is cumbersome. This paper presents the adoption of the Saint-Venant theory to develop a simple finite element program based on the displacement and stress function approaches using the standard linear and quadratic triangular elements. The displacement based approach is capable of evaluating torsional rigidity and shear stress distribution of homogeneous and nonhomogeneous; isotropic, orthotropic, and anisotropic materials; in singly and multiply-connected sections.  On the other hand, applications of the stress function approach are limited to the case of singly-connected isotropic sections only, due to the complexity on the boundary conditions. The results show that both approaches converge to exact solutions with high degree of accuracy.

Keywords


Saint-Venant torsion; multiply-connected section; torsional rigidity; homogeneous section; nonhomogeneous section

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References


  1. Schodek, D. and Bechthold, M., Structures, Pearson Higher Ed., 2013.
  2. Timoshenko, S. and Goodier, J. N., Theory of Elasticity, McGraw-Hill, 1951.
  3. Beer, F. P., Johnston, Jr., E. R., DeWolf, J. T., and Mazurek, D.F., Mechanics of Materials, Seventh edition, McGraw-Hill Education, New York, NY, 2015.
  4. Bathe, K. J., Finite Element Procedures, Prentice Hall, Upper Saddle River, N. J, 2006.
  5. Cook, R. D., Malkus, D. S., Plesha, M. E., and Witt, R. J., Concepts and Applications of Finite Element Analysis, Wiley New York, 1974.
  6. Desai, C. S. and Kundu, T., Introductory Finite Element Method, Taylor & Francis, 2001.
  7. Jog, C. S. and Mokashi, I. S., A Finite Element Method for the Saint-Venant Torsion and Bending Problems for Prismatic Beams, Computers & Structures, 135(12), 2014, pp. 62–72.
  8. Krahula, J. L. and Lauterbach, G. F., A Finite Element Solution for Saint-Venant Torsion, AIAA Journal, 7(12), 1969, pp. 2200–2203.
  9. Li, Z., Ko, J. M., and Ni, Y. Q., Torsional Rigidity of Reinforced Concrete Bars with Arbitrary Sectional Shape, Finite Elements in Analysis and Design, 35(4), 2000, pp. 349–361.
  10. Ely, J. F. and Zienkiewicz, O. C., Torsion of Compound Bars - A Relaxation Solution, International Journal of Mechanical Sciences, 1(1), 1960, pp. 356–365.
  11. Seaburg, P. A. and Carter, C. J., Torsional Analysis of Structural Steel Members, American Institute of Steel Construction (AISC), 1997.




DOI: https://doi.org/10.9744/ced.20.2.70-77



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