- Assessment of the effect of in-cycle degradation in behavior of mid-rise steel moment frames
- P.N. Lahiji ; G.H. Ghodrati Amiri ; E. Darvishan
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: In-cycle strength degradation ; incremental dynamic analysis ; Steel moment frame
- For many years, providing sufficient strength of buildings to avoid collapse prevention was the most important purpose in seismic codes. Nowadays, in-cycle strength degradation attracts the attention of many researchers as a real phenomenon. Recent investigations have shown that the effects of in-cycle strength degradation can be critical in determining the possibility of lateral dynamic instability in SDOF systems. In this research these
effects in multi-degree-of-freedom (MDOF) structures have been evaluated by modeling 3, 5 and 7 story steel moment frame buildings with three types of connections (Pre-Northridge, Post-Northridge and Elastic-Perfectly-Plastic). By performing incremental dynamic analysis (IDA), effects of in-cycle strength degradation in instability of structures have been studied. Results of this study have shown that in-cycle strength degradation can highly increase the dynamic global instability of the steel moment frame structures.