UNIVERSITY OF SOUTHERN CALIFORNIA
Department of Civil Engineering
NON-LINEAR EARTHQUAKE WAVES IN SEVEN-STOREY REINFORCED
Vlado Gicev and Mihailo D. Trifunac
Report CE 06-03
Los Angeles, California
The seven-story reinforced concrete building studied in this work was damaged during the 1994 Northridge, California earthquake. The damage was widespread but was mostly concentrated in the columns on the fourth floor, below the spandrel beam and the floor slab on the fifth floor. We show that such a concentration of damage can be explained by interference of non-linear waves in the building resulting from incident, upward-propagating earthquake pulses and downward propagation of pulses reflected from the roof of the building. We conclude that the analysis and prediction of where the localized damage may occur and the proper design to minimize and control such damage can be carried out best by non-linear wave propagation methods.