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Steel Moment-Resisting Frames with Mixed Ductile Moment-Shear Fuse

Alavi, Amir Ali | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52313 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. This thesis presents the seismic performance evaluation of steel MRFs with nonlinear replaceable links. Although existing MRFs can provide life safety during a design level earthquake, they are expected to sustain significant damage at the locations of flexural yielding fuses in the beams .These drawbacks can be mitigated by introducing replaceable links at the locations of expected inelastic action. Codes require that the span-to-depth ratio of the beams in moment resisting frames (MRF) should be limited to guarantee the development of plastic hinges with a sufficient length at beam ends. To overcome the abovementioned limits, in this paper a new replaceable shear structural fuse is introduced for MRFs. The link is a shear link designed as a sacrificial component by weakening the shear strength of a segment at the middle of the beam to dissipate the seismic energy by shear yielding with stable hysteretic behavior. The performance of the proposed system is compared with the conventional MRFs with flexural plastic hinges at reduced beam sections. In general, the shear yielding of the link is shown to be a great replacement for flexural hinges in MRFs. The behavior of six moment resisting frames with various story height is investigaited through dynamic analysis of the finite element model in ABAQUS. The results indicate that the moment resisting frame with reaplacale link provides a stiff and ductile system and also stable hysteretic loops, which makes it a suitable option for new buildings and retrofit of existing buildings as well
  9. Keywords:
  10. Plastic Hinges ; Ductile Fuse ; Time History Analysis ; Stable Energy Loop ; Steel Moment Resistant Frame ; Shear Fuse

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