Methods to Determine Ductility of Structural Members: A Review

  • Jen Hua Ling Centre for Research of Innovation and Sustainable Development, School of Engineering and Technology, University of Technology Sarawak
  • Yong Tat Lim Centre for Research of Innovation and Sustainable Development, School of Engineering and Technology, University of Technology Sarawak
  • Euniza Jusli Faculty of Engineering & Quantity Surveying, INTI International University
Keywords: Ductility Ratio, Structural Element, Reinforced Concrete, Elastic, Plastic


Ductility plays a crucial role in ensuring the safety of a structure, as its inadequacy can lead to sudden and brittle failure. Despite its significance, there is no explicit method for determining, leading to inconsistency and confusion in selecting appropriate techniques. Misjudging a structure’s ductile behaviour can have catastrophic consequences. Therefore, this study examined several preliminary studies and identified twenty-one methods for computing ductility indices. These indices were categorized into three types, namely conventional, displacement-based, and energy-based. The conventional ductility indices are commonly applied to steel-reinforced members, deformation-based ductility indices to FRP-reinforced members, and energy-based ductility indices to earthquake-resistant and static-load structures. Conventional ductility indices are specific to ductile reinforcements, while displacement-based and energy-based ductility indices apply to both ductile and non-ductile reinforcements. However, different calculation methods can lead to significant variations in the computed ductility, particularly for those involving the first crack, and load factor, thereby leading to different ductility requirements for ensuring structural safety. Additionally, not all methods are explicit, and it is crucial to avoid indiscriminately applying requirements from one method to another.

Author Biography

Yong Tat Lim, Centre for Research of Innovation and Sustainable Development, School of Engineering and Technology, University of Technology Sarawak

Centre for Research of Innovation and Sustainable Development, School of Engineering and Technology


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How to Cite
Ling, J. H., Lim, Y. T., & Jusli, E. (2023). Methods to Determine Ductility of Structural Members: A Review. Journal of the Civil Engineering Forum, 9(2), 181-194.