A CENTRIFUGE INVESTIGATION OF TWO DIFFERENT SOIL-STRUCTURE SYSTEMS WITH ROCKING AND SLIDING ON DENSE SAND

摘要: © 2017 National Technical University of Athens. All rights reserved. Seismic protection structures by means rocking isolation is becoming increasingly popular, because allowing uplift an inexpensive way to reduce structural demand. However, understanding the role soil-structure interaction in response systems important define what type system might be most effective. To address this challenge, a campaign based on centrifuge modelling and testing currently ongoing. The primary objective assess force demand that experience during their motion. Flexible rock while stepping discrete footings (structural rocking) flexible with soil (foundation are both considered. Following distinction, two building models were designed only difference being connectivity columns footings. For rocking, detach step footings, for foundation footing-column connection was rigid. tested side-by-side centrifuge. A second test also conducted, where thin steel "fuses" installed interface further study allocation energy dissipation between elements fuses, medium. placed surface dense sand then using sinusoidal ground motions which caused combination sliding rocking. global terms overturning moment storey shear investigated back validated obtaining directly internal loads, found capped regardless extent rotation. Moreover, base effect evident large amplitude resonant excitations, whereas low frequency excitation there no clear benefit Finally, significant observed limiting fuses.