Thesis
Investigation of the frictional effects of a deformable floor system for use in mid-rise structures
Washington State University
Master of Science (MS), Washington State University
2019
Handle:
https://hdl.handle.net/2376/104300
Abstract
Recent seismic events have caused concern surrounding the serviceability related damage to a structure post-event. Although the serviceability damages are to non-structural components of a building, they can be the most costly damage caused from a seismic event. This concern has led to efforts to mitigate the damages to structures and has increased the need for new methods to improve the structural resiliency of a building in seismic regions. To achieve this, a new inter-story isolation system is presented. The system is located in between stories in the floor system, rather than in the foundation of the structure, and the isolation system can utilized a series of springs, hysteretic dampers, and friction damping. The effects that varying the friction coefficient in the slip plane of the isolation layer can have on the dynamic response of the building are investigated in this study. By neglecting friction in the analysis, the results can yield drift ratios that are significantly lower than those of friction inclusive models. Isolating one story of the building has the most influence on reducing the building drifts of the structure. Isolating additional stories may be used to reduce the demands on the springs and dampers on the isolating layers at the stories above and below the isolating layer of interest, which can be a mitigation technique to avoid the use of flexible utility connections and a flexible anchor connection. The magnitude of the seismic event has a significant impact on the applicability of a deformable floor system with high coefficients of friction. A building must overcome the normal force in order to activate the isolation system. By reducing the coefficient of friction, the deformable floor system can achieve a wider range of applicability within a seismic region, but may require flexible utility connections.
Metrics
Details
- Title
- Investigation of the frictional effects of a deformable floor system for use in mid-rise structures
- Creators
- Sara Kathleen Loftus
- Contributors
- J. Daniel Dolan (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525110701842
- Language
- English
- Resource Type
- Thesis