APPLICATION OF PUSHOVER ANALYSIS TO THE DESIGN OFSTRUCTURES CONTAINING DISSIPATIVE ELEMENTS

摘要

Five and ten-storey steel frames incorporating dissipative knee elements are analysed using a variety ofnon-linear static pushover analysis procedures, in accordance with Eurocode 8, FEMA356 and ATC40.The non-linear analyses make use of a novel knee element model capable of accurately simulating thebending and shear behaviour observed in full-scale tests. The performance of the structures and of thepushover analysis methods is assessed using non-linear time-history analysis. It is shown that the kneeelements can be designed to yield under small earthquakes or early in a strong one (maximising theirenergy dissipation) while still being able to withstand a large event without collapse. Knee elements thushave the potential to give excellent seismic performance in steel framed structures. Comparison with thetime history analysis results suggests that the FEMA356 procedure, which includes a more accuraterepresentation of the structure's significant post-yield stiffness, gives the closest approximation to thedynamic response.