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Experimental Study on the Influence of Connections Rigidity in Steel Moment-Resisting Frames Under Fire Loading

Nejati, Shahin | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58119 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khonsari, Vahid
  7. Abstract:
  8. The present study evaluates the effect of connection rigidity on the behaviour of partially restrained frames under fire condition. Since the interaction of members with each other at elevated temperatures, controlled by the connections, has a significant effect on the behavior of the structure, a half-scaled three dimensional one-bay, one-story frame was used as the test specimen. In fact, this study is part of a broader research programme in which identical specimens equipped with similar connections (flush endplate connections) with various thicknesses hence various rigidities are studied. In order to record the deformations of structural members and the rotation of connections, Digital Image Processing (DIP) Method was used. The temperature was recorded in different locations of the structure and also the atmosphere of the furnace. The fire-resistance rate was evaluated to be 22 minutes, based on the beam deflection criterion, specified in the standard. Finally, the structure in the 29th minute of the test collapsed prematurely due to tearing of the weld joining the web of one of the beams to the endplate connection. The main failure patterns in this test included the buckling of the bottom flange of the beams near the joints, the lateral-torsional buckling of the beams, the failure of the top and middle row bolts due to combination of shear and tensile forces, and eventually thread stripping
  9. Keywords:
  10. Steel Moment Resistant Frame ; Rigidity ; Flush End-plate Connection ; Fire ; Elevated Temperature ; Steel Structures ; Semirigid Connection

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