Dismountable steel tensegrity grids as alternate roof structures

  • Panigrahi, Ramakanta (Civil Engineering Department, IIT Delhi) ;
  • Gupta, Ashok (Civil Engineering Department, IIT Delhi) ;
  • Bhalla, Suresh (Civil Engineering Department, IIT Delhi)
  • Received : 2007.11.30
  • Accepted : 2008.12.24
  • Published : 2009.05.25


This paper reviews the concept of tensegrity structures and proposes a new type of dismountable steel tensegrity grids for possible deployment as light-weight roof structures. It covers the fabrication of the prototype structures followed by their instrumentation, destructive testing and numerical analysis. First, a single module, measuring $1m{\times}1m$ in size, is fabricated based on half-cuboctahedron configuration using galvanised iron (GI) pipes as struts and high tensile stranded cables as tensile elements. Detailed instrumentation of the structure is carried out right at the fabrication stage. The structure is thereafter subjected to destructive test during which the strain and the displacement responses are carefully monitored. The structure is modelled and analyzed using finite element method (FEM) and the model generated is updated with the experimental results. The investigations are then extended to a $2{\times}2$ grid, measuring $2m{\times}2m$ in size, fabricated uniquely by the cohesive integration of four single tensegrity modules. After updating and validating on the $2{\times}2$ grid, the finite element model is extended to a $8{\times}8$ grid (consisting of 64 units and measuring $8m{\times}8m$) whose behaviour is studied in detail for various load combinations expected to act on the structure. The results demonstrate that the proposed tensegrity grid structures are not only dismountable but also exhibit satisfactory behaviour from strength and serviceability point of view.


tensegrity;dismountable;finite element method (FEM);strain;monitoring


  1. ANSYS version 9 (2004).
  2. Argyris, J.H. and Scharpf, D.W. (1972), "Large deflection analysis of prestressed networks", Journal of the Structural Division, ASCE, 98, 633-54.
  3. Batten, M., Boorman, R. and Leiper, Q. (1999), "Use of vibrating wire strain gauges to measure loads in tubular steel props supporting deep retaining walls", Proc. of Institution of Civil Engineers, Geotechnical Engineering, 137, 3-12.
  4. Fest, E., Shea, K. and Smith, I.F.C. (2004), "Active tensegrity structure", J. Struct. Eng., ASCE, 130,1454-65.
  5. Fu, F. (2005), "Structural behavior and design methods of tensegrity domes", J. Constr. Steel Res., 61, 23-35.
  6. Fuller, R.B. (1962), Tensile integrity structures, United States Patent No. 3, 063, 521.
  7. Gantes, C. (1997), "An improved analytical model for the prediction of the nonlinear behavior of flat and curved deployable space frames", J. Constr. Steel Res., 44, 129-158.
  8. Hanaor, A. (1993), "Double layer tensegrity grids as deployable structures", Int. J. Space Struct., 8,135-43.
  9. IS: 800 (1984), Code of practice for general construction in steel, Bureau of Indian Standards.
  10. IS: 875 II (1987), Code of practice for design loads (other than earthquake) for buildings and structures: Part II Imposed loads, Bureau of Indian Standards.
  11. IS: 875 III (1987), Code of practice for design loads (other than earthquake) for buildings and structures: Part III Wind loads, Bureau of Indian Standards.
  12. IS: 1239 I (1990), Mild Steel Tubes, Tubulars and Other Wrought Steel Fittings - Specification - Part 1: Mild Steel Tubes, Bureau of Indian Standards.
  13. IS: 1835 (1976), Specification for Round Steel Wire for Ropes, Bureau of Indian Standards.
  14. IS: 3459 (1977), Specification for Small Wire Ropes. , Bureau of Indian Standards.
  15. Kebiche, K., Kazi-Aoual, M.N. and Motro, R. (1999), "Geometric non-linear analysis of tensegrity systems", Eng. Struct., 21, 864-76.
  16. Panigrahi, R. (2007), "Development, analysis and monitoring of dismountable tensegrity structure", Ph. D. thesis, Department of Civil Engineering, Indian Institute of Technology Delhi.
  17. Quirant, J., Kazi-Aoual, M.N. and Motro, R. (2003), "Designing tensegrity systems: the case of a double layer grid", Eng. Struct., 25, 1121-30.
  18. Snelson, K. (2004), accessed January 2005-December 2005.
  19. Stern, I.P. (1999), "Development of design equations for self deployable N- strut tensegrity systems", M.S. Thesis, University of Florida.
  20. Sultan, C. and Skelton, R.E. (2003), "Deployment of tensegrity structures", Int. J. Solids Struct., 40, 4637-57.
  21. Tokyo Sokki Kenkyujo Company Limited (TML). (2006),
  22. Tibert, A.G. and Pellegrino, S. (2002), "Deployable tensegrity reflectors for small satellites", J. Spacecraft Rockets, 39, 701-09.
  23. Tibert, A.G. and Pellegrino, S. (2003), "Deployable tensegrity masts", Proc. of 44th" AIAA/ASME/ASC/ASCE/AHS/ASC Structures Structural Dynamics and Materials Conf. and Exhibit, Norfolk 1-11.
  24. Vu, K.K., Liew, J.Y.R. and Krishnapillai, A. (2005), "Deployable tension strut structure: conceptualization to implementation", J. Constr. Steel Res., 62, 195-206.
  25. Vu, K.K., Liew, J.Y.R. and Krishnapillai, A. (2006), "Rapidly deployed tension-strut structures", Proc. of 8th Int. Conf. on Steel, Space and Composite structures, 15-17 May, Kuala Lumpur, 145-52.
  26. Wang, B.B. and Li, Y.Y. (2003), "Novel cable strut grids made of prisms: part1 Basic theory and design", Int. J. Space Struct., 44, 93-125.
  27. You, Z. and Pellegrino, S. (1997), "Cable-stiffened pantographic deployable structures 2. mesh reflector", AIAA J., 35, 1348-55.
  28. Zhang, J.Y. and Ohsaki, M. (2006), "Adaptive force density method for form-finding problem of tensegrity structure", Int. J. Solids Struct., 43, 5658-73.

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