Dr. Balasubramaniam Janarthanan


Senior Lecturer Grade II

Department of Civil Engineering


PhD(QUT, Australia), B.Sc.Eng.(Hons)(Moratuwa), AMIE(SL)


Research interests : Structural behaviour and design of cold-formed steel floor systems


  jana151188@eng.jfn.ac.lk
 +94-21-206-0160


Dr.B.Janarthanan has obtained his B.Sc.Eng.(Hons) degree with First Class Honors from the University of Moratuwa in 2014. Then he worked as an instructor for five months and contract basis lecturer for five months at the University of Moratuwa. Later he has completed his PhD at the Queensland University of Technology, Australia. His thesis title is Structural behavior and design of cold-formed steel floor systems, in which different failure modes (web crippling, bending and torsion) of cold-formed steel unlipped channel sections were investigated.

He is a chairman of the Faculty Board appointed studentship/ scholarship committee and coordinator for B.Ed. in Engineering Technology at faculty, offered by National Institute of Education (NIE), Sri Lanka to technology teachers from North and East of Sri Lanka. His research areas are self-compacting concrete and failures of cold-formed steel.

He is an associate member of Institute of Engineers Sri Lanka (IESL)

Overall: Structural behaviour of cold-formed steel floor systems

Summary of Research:
Cold-formed steel is increasing popular over hot-rolled steel due to its lightweight. However, these sections are vulnerable to web crippling/ bearing failure due to its higher width to thickness ratio. Short span members fail due to web crippling whereas long span specimens fail due to combined actions of web crippling, bending and torsion. No design equations are available to predict ultimate capacities of unlipped channel sections with their flanges fastened to supports subject to the actions of web crippling, combined web crippling and bending and combined bending and torsion. The effects of varying connection stiffness on the structural behaviour of unlipped channel sections is also not known. His PhD research addressed these important structural behavioural issues related to unlipped channel section bearers used in floor systems.

His research interests are:

  • Cold-formed floor systems
  • Web crippling, Bending and torsion failures
  • Finite element analysis
  • Self-compacting concrete


  • He was awarded Mahapola scholarship during his undergraduate study
  • QUT Postgraduate Research Award (QUTPRA)
  • Supervisors Top-up Scholarship and QUT Higher Degree Tuition Fee Award during his PhD career
  • Best Civil Engineering student award based on the performance in the Comprehensive Design Project (CDP) for the academic year 2011/ 2012


  • Associate Member of the Institution of Engineers Sri Lanka (IESL)
  • Member of Sri Lanka Association for the Advancement of Science



International Journals
5 results
2020
[5]Numerical study of cold-formed steel channel sections under combined web crippling and bending action ( and ), In In Thin-Walled Structures, volume 152, .
[4]Effect of web holes on the web crippling capacity of cold-formed LiteSteel beams under End-Two-Flange load case ( and ), In In Structures, volume 25, .
2019
[3]Numerical modelling of web crippling failures in cold-formed steel unlipped channel sections ( and ), In Journal of Constructional Steel and Research, volume 158, .
[2]Web crippling behavior and design of cold-formed steel scetions ( and ), In Thin-walled Structures, volume 140, .
2015
[1]Bearing Capacity of Cold-Formed Unlipped Channels with Restrained Flanges- EOF and IOF Load Cases ( and ), In Steel Construction Design and Research, volume 8, .
International Conference and Workshop Papers
1 result
2015
[1]Bearing Capacity of Cold-Formed Unlipped Channels with Restrained Flanges- EOF and IOF Load Cases (, and ), In Proceedings of 13th Nordic Steel Construction Conference(NSCC 2015), .
National Conference and Workshop Papers
2 results
2020
[2]Finite element analyses of cold-formed steel unlipped channel beam with web openings in web crippling ( and ), In In 113th Annual Technical Session, .
2013
[1]Effects of Fines on critical Hydraulic Gradient of Soils at Optimum Moisture Content (), In Young Members’ Technical Conference, Institution of Engineers Sri Lanka, .