Assessment of Plastic Deformation and Hysteresis in Steel Moment Frames Subjected to Controlled Harmonic Motion
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| izdano v: | ProQuest Dissertations and Theses (2025) |
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ProQuest Dissertations & Theses
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| Online dostop: | Citation/Abstract Full Text - PDF |
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| 100 | 1 | |a Madrigal, David | |
| 245 | 1 | |a Assessment of Plastic Deformation and Hysteresis in Steel Moment Frames Subjected to Controlled Harmonic Motion | |
| 260 | |b ProQuest Dissertations & Theses |c 2025 | ||
| 513 | |a Dissertation/Thesis | ||
| 520 | 3 | |a Structural steel moment frames are a common lateral force resisting system used in earthquake-prone regions around the world. Steel moment frames are important for seismic design, not just for their ductility but for their ability to dip into the nonlinear capacity of steel through the use of a plastic hinge collapse mechanism, informally referred to as “strong-column, weak beam”. The theory behind this mechanism and its intended failure mode is explored in this thesis, along with how it is currently applied in the American Institute of Steel Construction (AISC) 341 Seismic Design Provisions. Moment frames tend to be difficult to model without considering the full scale, which can require a large testing setup to examine the full dynamic behavior of the structure. To circumvent this issue, an experimental procedure is developed to allow engineers to test the effects of a steel moment frame using a scale model. This scale model is fabricated using a fused deposition modeling (FDM) 3D printer, commonly found in universities and selected for their accessibility to students. The scale model is made out of polyethylene terephthalate glycol (PETG), selected for its similar ductility to steel relative to its elastic modulus. The PETG model is constructed and tested on a shake-table through uniaxial harmonic motion to determine modal frequencies and associated mode shapes. The shake table testing produced a harmonic base excitation force and response plots for the modes of the structure. In tandem, two analytical models are created for verification of the test properties: the PETG structure is modeled in Ansys Mechanical, and the steel structure is modeled at true scale in ETABS. These analytical models are loaded with the same input harmonic function used on the shake table testing. Hysteresis in each model is explored as a means of comparing the nonlinear response between the PETG model and the steel model. Applications of this approach to modeling are explored and further refinements for more accurate modeling are proposed. | |
| 653 | |a Civil engineering | ||
| 653 | |a Engineering | ||
| 653 | |a Plastics | ||
| 773 | 0 | |t ProQuest Dissertations and Theses |g (2025) | |
| 786 | 0 | |d ProQuest |t Publicly Available Content Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/3216805618/abstract/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/3216805618/fulltextPDF/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |