The estimation of incremental dynamic analysis diagram based on the N2 method according to the Park-Ang damage model

Articles in Press

Document Type : Original Article

Authors

1 PhD. Candidate, Department of civil engineering, Babol Noshirvani University of Technology, Babol, Iran

2 Professor, Department of civil engineering, Babol Noshirvani University of Technology, Babol, Iran

3 Associate Professor, Faculty of Civil Engineering, Noshirvani University of ‎Technology, Babol, Iran

10.22065/jsce.2024.414678.3213

Abstract

This paper aims to estimate the maximum target displacement and structural performance at different damage levels under Incremental Dynamic Analysis (IDA) based on the Park-Ang damage index model. The mentioned method is based on the intersection of the pushover capacity curve with the seismic risk demand curve, known as the N2 method, and the development of the energy-based Incremental Dynamic Analysis (IDA) until the collapse condition. Therefore, the nonlinear response acceleration ratio based on the Park-Ang damage model at different damage levels and periods of vibration was determined to develop the nonlinear response spectra from the elastic ones. Then, a relationship between the strength reduction factor (R), damage model, and period of vibration (R-DI-T) was extended to predict the target displacement at the desired seismic hazard level, known as the performance point. Also, the mathematical equations based on least-square nonlinear regression analysis were obtained to estimate the maximum nonlinear acceleration ratio and R-DI-T relation. Three 1-, 7-, and 10-story steel moment resisting frames and two empirical reinforced concrete (RC) pier were used to evaluate the accuracy of the proposed method. Statistical results show that the difference between estimated and mean displacements obtained from nonlinear time history analysis is not higher than 20%. Also, the mentioned difference is valid for IN2 diagrams achieved from the estimated and direct values.

Keywords

Main Subjects

Journal of Structural and Construction Engineering

Articles in Press, Accepted Manuscript
Available Online from 25 January 2024

Files

History

  • Receive Date: 03 September 2023
  • Revise Date: 17 December 2023
  • Accept Date: 25 January 2024

Share

How to cite

Statistics