Structural Engineering and Mechanics

  • 제62권5호
  • /
  • Pages.567-576
  • /
  • 2017
  • /
  • 1225-4568(pISSN)
  • /
  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Rehabilitation of a distressed steel roof truss - A study

  • Dar, M.A. (Department of Civil Engineering, MSRIT) ;
  • Subramanian, N. (Consuting Engineer) ;
  • Dar, A.R. (Department of Civil Engineering, NIT Srinagar) ;
  • Raju, J. (Department of Civil Engineering, MSRIT)
  • 투고 : 2016.12.28
  • 심사 : 2017.03.29
  • 발행 : 2017.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

Structural failures are undesirable events that devastate the construction industry resulting in loss of life, injury, huge property loss, and also affect the economy of the region. Roof truss failures occur mainly due to excessive loading, improper fabrication, deterioration, inadequate repair, etc. Although very rare, a roof truss may even fail due to inappropriate location of supports. One such case was reported from the recent failure of a steel roof truss used in an indoor stadium at Kargil in India. Kargil region, being mountainous in nature, receives heavy snowfall and hence the steel roof trusses are designed for heavy snow loads. Due to inappropriate support location, the indoor stadium's steel roof truss had failed under heavy snow load for which it was designed and became an interesting structural engineering problem. The failure observed was primarily in terms of yielding of the bottom chord under the supports, leading to partial collapse of the roof truss. This paper summarizes the results of laboratory tests and analytical studies that focused on the validation of the proposed remedial measure for rehabilitating this distressed steel roof truss. The study presents the evaluation of (i) significant reduction in strength and stiffness of the distressed truss resulting in its failure, (ii) desired recovery in both strength and stiffness of the rectified truss contributed by the proposed remedial measure. Three types of models i.e., ideal truss model, as build truss model and rectified truss model were fabricated and tested under monotonic loading. The structural configuration and support condition varied in all the three models to represent the ideal truss, distressed truss and the rectified truss. To verify the accuracy of the experimental results, an analytical study was carried out and the results of this analytical study are compared with the experimental ones.

키워드

참고문헌

  1. Abramyana, S.G. and Ishmametova, R.K. (2016), "Strengthening timber roof trusses during building construction and reconstruction", International Conference on Industrial Engineering, ICIE 2016, Procedia Engineering, doi: 10.1016/j.proeng.2016.07.253.
  2. Anbarasu, M. (2016), "Local-distortional buckling interaction on cold formed steel lipped channel beams", Thin Wall. Struct., 98, 351-359. https://doi.org/10.1016/j.tws.2015.10.003
  3. Barbari, M., Cavalli, A., Fiorineschi, L., Monti, M. and Togni, M. (2014), "Innovative connection in wooden trusses", Constr. Build. Mater., 66, 654-663. https://doi.org/10.1016/j.conbuildmat.2014.06.022
  4. Branco, J.M., Piazza, M. and Cruz, P.J.S. (2010), "Structural analysis of two King-post timber trusses: Non-destructive evaluation and load-carrying tests", Constr. Build. Mater., 24(3), 371-383. https://doi.org/10.1016/j.conbuildmat.2009.08.025
  5. Burdzik, W.M.G. and Skorpen, S.A. (2014), "Metal-strip bracing versus diagonal timber bracing in timber trussed tiled roofs", Eng. Struct., 75, 1-10. https://doi.org/10.1016/j.engstruct.2014.05.038
  6. Dar, M.A., Subramanian, N., Dar, A.R. and Raju, J. (2015), "Experimental investigations on the structural behaviour of a distressed bridge", Struct. Eng. Mech., 56(4), 695-705. https://doi.org/10.12989/sem.2015.56.4.695
  7. Dawe, J.L., Liu, Y. and Li, J.Y. (2010), "Strength and behaviour of cold-formed steel offset trusses", J. Constr. Steel Res., 66(4), 556-565. https://doi.org/10.1016/j.jcsr.2009.10.015
  8. Foo, H.C. (1993), "Experimental study on timber trusses and joints", J. Struct. Eng., 119(4), 1283-1296. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:4(1283)
  9. Ganesan, T.P. (2000), Model Analysis of Structures, University Press, Hyderabad.
  10. Hibbler, R.C. (2008), Structural Analysis, 6th Edition, Pearson Education, (pp. 79-111). Upper Saddle River, New Jersey.
  11. I.S.1608 (2005), Indian Standard- Metallic Materials - Tensile Testing at Ambient Temperature, Bureau of Indian Standards, New Delhi, India.
  12. I.S.800 (2007), Indian Standard- General Construction in Steel, Code of Practice, Bureau of Indian Standards, New Delhi, India.
  13. Jagadish, R. (1995), Structural Failures, Case Histories, Oxford & IBH Publishing, Delhi.
  14. Munafo, P., Stazi, F., Tassi, C. and Davi, F. (2015), "Experimentation on historic timber trusses to identify repair techniques compliant with the original structural-constructive conception", Constr. Build. Mater., 87, 54-66. https://doi.org/10.1016/j.conbuildmat.2015.03.086
  15. Piroglu, F. and Ozakgul, K. (2016), "Partial collapses experienced for a steel space truss roof structure induced by ice ponds", Eng. Fail. Anal., 60, 155-165. https://doi.org/10.1016/j.engfailanal.2015.11.039
  16. Piroglu, F., Ozakgul, K., Iskender, H., Trabzon, L. and Kahya, C. (2014), "Site Investigations of damages occurred in a steel space truss roof structure due to ponding", Eng. Fail. Anal., 36, 301-313. https://doi.org/10.1016/j.engfailanal.2013.10.018
  17. Schodek, D.L. (2000), Structures, 4th Edition (pp.15, and pp.132-57). Prentice Hall, Upper Saddle River, New Jersey.
  18. Shiyekar, M.R. (2015), Limit State Design in Structural Steel, 2nd Edition, Prentice Hall India, New Delhi.
  19. SP 6(1) (1964), Handbook for Structural Engineers, Structural Steel Sections. Bureau of Indian Standards, New Delhi, India.
  20. Subramanian, N. (1998), "Rehabilitation of steel structures- some case studies", Advanced Course on Design of Steel Skeletal Structures, SERC, Madras.
  21. Subramanian, N. (2010), Steel Structures, Design and Practice (pp. 113-31, 193-227, 266-97, and pp.570-72), Oxford University Press, New Delhi.
  22. Subramanian, N. (2014), "Codification and methods to improve the Process", Bridge Struct. Engineer, 44(2), 1-12.
  23. Subramanian, N. (2014), "The failures that changed the perception of our designs", Bridge Struct. Engineer, 45(4), 24-44.
  24. STAAD.ProV8i, Technical Reference Manual, Bentley Systems; 2012.

피인용 문헌

  1. Behaviour of partly stiffened cold-formed steel built-up beams: Experimental investigation and numerical validation vol.22, pp.1, 2017, https://doi.org/10.1177/1369433218782767
  2. Flexural Strength of cold-formed steel built-up composite beams with rectangular compression flanges vol.34, pp.2, 2017, https://doi.org/10.12989/scs.2020.34.2.171
  3. Efficient cross-sectional profiling of built up CFS beams for improved flexural performance vol.34, pp.3, 2017, https://doi.org/10.12989/scs.2020.34.3.333
  4. Performance evaluation of different strengthening measures for exterior RC beam-column joints under opening moments vol.74, pp.2, 2020, https://doi.org/10.12989/sem.2020.74.2.243