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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 51460 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Maleki, Shervin
- Abstract:
- Fillet welds are widely used in steel construction due to their high strength and economy. In the joints used in construction, eccentricity loads in complex weld stress. The current research involves 72 bending specimens and 16 torsion specimens being modeled to study different design code relationships regarding the plastic properties of welds. In line with an even comprehensive study, the previous experimental programs in this field have been added to the modeling results.Reliability analysis has been applied to examine code relationships more precisely. The analysis involved examination of various uncertainties which showed that applying elastic methods proves more conservative than other methods concerning bending specimens. Considering plastic state, the safety index also declines standing above that of instantaneous center of rotation method. In a general view, all of the three methods are conservative. The results pertaining to the torsion specimens also proved that the relationship of elastic state is a conservative one and considering the polar moment of inertia at 1.5 times above that of elastic state, the reliability index stands at 4.1.The previous models for prediction of the capacity of the joints subjected to bending loading were also studied. The results showed that the recently proposed models which consider the effects of the transfer of compressive stresses through plates are more appropriate.In parametric study, the current research also average stress in proportion to displacement variations and stress distribution in height in bending specimens at tension leg, shear leg and common surface of plates. Subsequently, different results such as determining maximum normal and shear stress points and location of the neutral axis in the bending connections were obtained
- Keywords:
- Finite Element Method ; Reliability Analysis ; Welded Joint ; Elastic Modulus ; Rotation Instantaneous Center ; Welds Subjeced to Bending ; Welds Subjeced to Torsion ; Weld Plastic Section Modulus
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