Seismic performance of diagrid steel structures using single and double friction mass dampers Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nc580r17r

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  • The steel diagrid structural system is a recent load bearing and lateral resisting structural system for tall building structures that is relatively unexplored in the western United States. One possible reason for the little use of diagrid systems in earthquake prone regions is the lack of guidelines and application examples illustrating the design and analysis of these structures. In this work, a prototype building with 72 stories is used as an example for which the design and analysis of the diagrid system is performed. To mitigate the possible large displacement and base shear demands that these structures may undergo under seismic events, two new design solutions consisting of one or two friction tuned mass damper (TMD) units are explored. In the first solution, a TMD is placed on the top four stories of the building and is tuned to reduce the contribution of the fundamental mode of vibration of the structure. The second solution uses a double TMD system, in which a second TMD unit - tuned to the second period of the structure – is added at mid-height of the building. Using a nonlinear finite element model of the tuned mass damper, the effectiveness of the friction mass damper design is studied. The mass damper system consists of a concrete tank containing sand or water. The tank is placed in between the building reinforce concrete structural core and the exterior steel diagrid system. This mass damper is connected to the structure using friction pendulum isolators which are chosen due to their ability to undergo large deformations. The models are then subjected to earthquake ground motions from historical shallow crustal and subduction-zone events. Parametric studies are carried out to optimize the mass damper design in improving the seismic performance of the building. Optimization of the seismic performance is assessed in terms of minimization of inter-story drift ratios, base and story forces, as well as floor absolute accelerations. The results show that the single TMD system can reduce significantly the peak base reaction and inter-story drift envelopes. Addition of the second TMD provides further improvements in terms of reducing the peak base reactions, while also producing notable reductions in peak absolute floor accelerations, which are not observed when only one TMD unit is used.
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