Effect of Hysteresis Type on Drift Limit for Global Collapse of Moment Frame Structures Under Seismic Loads

Seismic analyses of 3-, 9-, and 20-story moment resisting frame (MRF) buildings with 5 hysteresis models were conducted. The objectives of the study were to study the effect of the hysteresis type on the global collapse drift limit, seismic demand, and capacity/demand ratio for MRF structures under seismic loads. The results show that strength degradation significantly decreases the global drift limit and the safety of the structure, whereas, the existence of stiffness degradation or pinching has small effect. The results suggest that the global drift limit for a building is not likely to be the collapse limit state (CLS) which will most likely be governed by local collapse.