Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Developing a damage index based on plastic strain energy and fragility curves based on this index in reinforced concrete bending frames.

Document Type : Original Article

Authors
Ebrahim Mirzadeh 1
Alireza Mortezaei 2
Alireza Bitaraf 3
Ali Hemmati 3
1 Civil Engineering Department, SemnanBranch, Islamic Azad University, Semnan, Iran
2 Professor, Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
3 Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
10.22065/jsce.2024.469836.3488
Abstract
The aim of this research is to provide a simple method for calculating the damage index and also the development of fragility based on this index in 3, 6 and 9 story reinforced concrete structures with a special bending frame system. After the initial design, the structures have been modeled non-linearly in PERFORM-3D software and analyzed by IDA by 20 near-field records. The proposed damage index is defined as the amount of strain energy lost in the structure in each record to the amount of energy at the instability point of the structure in the same record. In order to reach these two important parameters, incremental dynamic analysis should be performed considering the wasted strain energy as the engineering demand parameter (EDP). In order to evaluate the efficiency and accuracy of this method, the damage index and fragility curves were also calculated based on the Park-Ang method and the results were compared with the presented method. Also, low, medium, high and complete damage levels have been calculated by calibrating the presented method with the Park-Eng method. The results show that the fragility obtained by the Park-Eng method is very similar to the simple method presented in this research. For example, 50% fragility in a three-story structure, with the method presented in this research in four levels of low, medium, high, and complete damage, respectively, at the maximum accelerations of 0.45, 0.7, 1, and 1.15g, and with the Park-Eng method in Maximum accelerations of 0.6, 0.75, 0.95 and 1.2 g occur.
Keywords
Damage index
Energy method
RC structures
IDA analysis
Plastic strain energy

Subjects

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Journal of Structural and Construction Engineering
Volume 12, Issue 06 - Serial Number 95
September 2025
Pages 282-304

  • Receive Date 31 August 2024
  • Revise Date 16 November 2024
  • Accept Date 24 December 2024