Blast Load Analysis of Pre-twisted Steel Columns

  • Nivin PhilipEmail author
  • Theresa Paul
Original Contribution


A pre-twisted column has its strong flexural weakened plane, and if the weakened plane is strengthened, it leads to a favourable effect on the buckling effect of the pre-twisted column. A linear buckling analysis was conducted for the boxed and unboxed sections of columns with varying twisted angles using ANSYS workbench. It was found that pre-twisting was effective in increasing the buckling capacity of a column up to 51% for unboxed columns having an optimal twist angle of 135° and 15% increase for boxed columns showing an optimal angle of 155°. Blast load analyses on pre-twisted columns were conducted for loaded and unloaded conditions using ANSYS AUTODYN for 10 kg of TNT (trinitrotoluene). A column subjected to a 10-kg blast load could withstand the blast without any failure. The kinetic energy absorbed by the columns diminished for 10 kg of TNT, and loaded columns yielded without initiation of any cracks, whereas unloaded sections did not yield.


Pre-twisted Buckling Blast Slenderness ratio Wedge Johnson–Cook Thin walls 



The authors are thankful to Mar Athanasius College of Engineering, Kothamangalam (Structural Engineering Design Studio), for conducting this research.


  1. 1.
    N. Madhusudhana, B. Gautham, N. Ganesan, Buckling behavior of uniformly and non-uniformly pretwisted beams. Comput. Struct. 54(3), 551–556 (1995)CrossRefzbMATHGoogle Scholar
  2. 2.
    S.A. Barakat, Experimental investigation of the axial capacity of inelastically pretwisted steel bars. J. Eng. Mech. 136(8), 1028–1035 (2010)CrossRefGoogle Scholar
  3. 3.
    M. Serra, Flexural buckling of pretwisted columns. J. Eng. Mech. 119(6), 1286–1292 (1993)CrossRefGoogle Scholar
  4. 4.
    B. Tabarrok, Y. Xiong, On the buckling equations for spatial rods. Int. J. Mech. Sci. 31(3), 179–192 (1989)CrossRefzbMATHGoogle Scholar
  5. 5.
    B. Tabarrok, X. Yuexi, D. Steinman, W.L. Cleghorn, On buckling of pretwisted columns. Int. J. Solid Struct. 26(5), 59–72 (1990)CrossRefzbMATHGoogle Scholar
  6. 6.
    L. Mazurkiewicz, J. Malachowski, P. Baranowski, Blast loading influence on load carrying capacity of I-column. Eng. Struct. 104(10), 107–115 (2015)CrossRefGoogle Scholar
  7. 7.
    N.K. Bairagi, D.S. Kanvinde, Torsion of concrete beams using pretwisting technique. Constr. Build. Mater. 7(1), 45–51 (1993)CrossRefGoogle Scholar
  8. 8.
    F.H. Abed, M.H. AlHamaydeh, S.A. Barakat, Nonlinear finite-element analysis of buckling capacity of pretwisted steel bars. J. Eng. Mech. 139(7), 791–801 (2013)CrossRefGoogle Scholar
  9. 9.
    F.H. Abed, M. Megahed, A. Al-Rahmani, On the improvement of buckling of pretwisted universal steel columns. Structures 5, 152–160 (2015)CrossRefGoogle Scholar
  10. 10.
    S.-P. Chiew, S.-L. Lee, N.E. Shanmugam, Experimental study of thin-walled steel box columns. J. Struct. Eng. 113(10), 2208–2220 (1987)CrossRefGoogle Scholar
  11. 11.
    A.K. Tiwary, A.K. Tiwary, A. Kumar, Blast loading effects on steel columns. IOSR J. Mech. Civ. Eng. 6(3), 17–22 (2015)Google Scholar
  12. 12.
    A.A. Nassr, A.G. Razaqpur, M.J. Tait, M. Campidelli, S. Foo, Experimental performance of steel beams under blast loading. J. Perform. Construct. Facil. 26(5), 600–619 (2012)CrossRefGoogle Scholar
  13. 13.
    S. Yao, D. Zhang, X. Chen, F. Lu, W. Wang, Experimental and numerical study on the dynamic response of RC slabs under blast loading. Eng. Fail. Anal. 66, 120–129 (2015)CrossRefGoogle Scholar
  14. 14.
    M.A. Yusof, R.N. Rosdi, N.M. Nor, A. Ismail, M.A. Yahya, N.C. Peng, Simulation of reinforced concrete blast wall subjected to air blast loading. J. Asian Sci. Res. 4(9), 522–533 (2014)Google Scholar
  15. 15.
    F. Zhang, W. Chengqing, H. Wang, Y. Zhou, Numerical simulation of concrete filled steel tube columns against BLAST loads. Thin Walled Struct. 92, 82–92 (2015)CrossRefGoogle Scholar
  16. 16.
    V. Karlos, G. Solomos, Calculation of Blast Loads for Application to Structural Components. JRC technical reports (2013)Google Scholar
  17. 17.
    N. Jha, B.S. Kiran Kumar, Air blast validation using ANSYS/AUTODYN. Int. J. Eng. Res. Tehnol. 3(1), 1794–1797 (2014)Google Scholar

Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  1. 1.Mar Baselious Christian College of Engineering and TechnologyPeermadeIndia
  2. 2.Mar Athanasius College of EngineeringKothamangalamIndia

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