Ductility damage indices based on seismic performance of RC frames

• Published in: Soil dynamics and earthquake engineering (1984) Vol. 77; pp. 226 - 237
• Main Authors: Alhaddad, Mohammad S., Wazira, Khalid M., Al-Salloum, Yousef A., Abbas, Husain
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2015
• Subjects: Assessments; Damage; Damage index; Drift limit; Ductility; Ductility tests; Frames; Mathematical analysis; Reinforced concrete; Seismic performance; Seismic response; RC; Drift limit; Ductility; Damage index; Seismic performance
• ISSN: 0267-7261; 1879-341X
• DOI: 10.1016/j.soildyn.2015.05.014

This paper presents an analytical procedure for determining ductility damage indices using static collapse mechanism analysis for ductile reinforced concrete (RC) frames subjected to prescribed drift limits corresponding to different seismic performance levels. This assessment benefits from performance-based seismic design (PBSD) concept that employs rotation ductility factors, pre-defined target damage indices and beam sidesway mechanism as key performance objectives to estimate curvature ductility demands at pre-designated plastic hinges of beam sidesway mechanism. The proposed ductility-based damage indices (DBDI) assessment procedure considers regular frames with secondary effects such as P-Delta and soil–structure interaction (SSI) within a simple non-iterative process suitable for practical applications. A 12-story RC moment frame was chosen to implement the proposed procedure considering P-Delta effect. Pushover analysis using SAP 2000 was carried out for the frame to verify the results of the DBDI method. The results show that the DBDI seismic assessment procedure can be used to quantify the damage potential at different performance levels and relate that to local flexural ductility of critical frame members. The research presented in this paper provides a simple yet conservative damage assessment tool for use by practicing engineers. •A procedure for determining ductility damage indices for RC frames is presented.•Method employs static collapse mechanism analysis with prescribed drift limits.•Performance-based seismic design concept employs rotation ductility factors.•Secondary effects such as P-Delta and soil–structure interaction are considered.•Pushover analysis of SAP 2000 was used to verify the results for a 12 storey RC frame.