Damaged Identification In Framed Structure Using Natural Frequencies In Etabs

• Author(s):

  Shrenika Sheshgiri Pai | Prof. Abhijeet Undre | Dr. Atul Pujari

• Keywords:

  Structural Health Monitoring; Damage Identification; ETABS; Natural Frequency; Modal Analysis; Stiffness Reduction; Framed Structure; Storey Displacement; Base Shear.

• Abstract:

  Structural Damage Identification Is An Important Part Of Structural Health Monitoring Because Damage In Beams, Columns, Joints And Lateral-load-resisting Members Reduces Stiffness And Changes The Dynamic Behaviour Of Framed Structures. In Reinforced Concrete High-rise Buildings, Damage May Occur Due To Cracking, Corrosion, Overloading, Seismic Action, Material Deterioration Or Loss Of Member Stiffness. Such Damage May Not Always Be Visible During Routine Inspection, But It Can Be Identified Through Changes In Modal Parameters Such As Natural Time Period And Natural Frequency. The Present Study Deals With Damage Identification In A Framed Structure Using Natural Frequencies Obtained From ETABS Analysis. A G+15 Reinforced Concrete High-rise Building With Moment-resisting Frame And Shear Wall System Was Modelled In ETABS. The Plan Dimension Of The Structure Is 40 M × 20 M, With A Ground Storey Height Of 4.0 M, Typical Storey Height Of 3.0 M And Total Height Of 49 M. M25 Concrete And Fe500 Steel Were Used For Modelling. The Structure Was Analysed For Three Conditions: Undamaged Model, 25% Damaged Model And 50% Damaged Model. Damage Was Simulated By Reducing Selected Property Modifiers Of Beams And Columns While Keeping Mass And Weight Modifiers Constant. Modal Analysis Was Performed To Obtain The First Twelve Mode Shapes, Natural Time Periods And Frequencies, While Response Spectrum Analysis Was Used To Evaluate Displacement, Storey Drift And Base Shear Under EQX Loading. The Results Show That The Fundamental Time Period Increased From 2.1299 S In The Undamaged Model To 2.4381 S And 2.9458 S In The 25% And 50% Damaged Models Respectively. Correspondingly, The Natural Frequency Reduced From 0.4695 Hz To 0.4102 Hz And 0.3395 Hz. This Confirms That Reduction In Stiffness Increases Flexibility And Reduces Natural Frequency. Therefore, Natural Frequency Variation Can Be Effectively Used As A Simple And Practical Indicator For Identifying Damage In Framed Structures.

---

Other Details

• Paper id:

  IJSARTV12I6105733

• Published in:

  Volume: 12 Issue: 6 June 2026

• Publication Date:

  2026-06-26

Download Article