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Design, Fabrication, and Testing of a Variable Stiffness Device for Seismic Isolation of Acceleration-Sensitive Equipment

Haftman, John T
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1566387343935537

Abstract Details

2019, Master of Science (MS), Ohio University, Individual Interdisciplinary Program.
Control over the response of structures and their contents to seismic excitation has been a goal of engineers for hundreds of years. By implementing isolation strategies, base acceleration and inter-story drift can be reduced with subsequent prevention of plastic deformation and possible structure collapse. Recently, a greater focus has been placed upon protecting acceleration-sensitive equipment from input motions. This shift in methodology is due to the proliferation of delicate equipment, coupled with an ever expanding knowledge of the effects of seismic responses. The purpose of this thesis is to introduce a variable stiffness device (VSD) specifically designed to protect equipment through seismic isolation. The system is capable of producing a positive, variable stiffness passively in order to shift the natural frequency of the isolated components from the dominant frequency of the seismic inputs. Additionally, the system is capable of producing a variable negative stiffness passively in order to produce desirable apparent weakening characteristics. Mathematical models were generated to determine the geometry of components and response of the overall system. A working prototype was fabricated and tested to validate the theoretical force-displacement profiles of the device.
Kenneth Walsh (Advisor)
170 p.
Civil Engineering; Industrial Engineering
Equipment isolation; seismic protection; variable stiffness device

Recommended Citations

Citations

  • Haftman, J. T. (2019). Design, Fabrication, and Testing of a Variable Stiffness Device for Seismic Isolation of Acceleration-Sensitive Equipment [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1566387343935537

    APA Style (7th edition)

  • Haftman, John. Design, Fabrication, and Testing of a Variable Stiffness Device for Seismic Isolation of Acceleration-Sensitive Equipment . 2019. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1566387343935537.

    MLA Style (8th edition)

  • Haftman, John. "Design, Fabrication, and Testing of a Variable Stiffness Device for Seismic Isolation of Acceleration-Sensitive Equipment ." Master's thesis, Ohio University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1566387343935537

    Chicago Manual of Style (17th edition)

ohiou1566387343935537
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This open access ETD is published by Ohio University and OhioLINK.