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Inelastic Modeling of Mixed Hinge in Deformation Space and its Application in the Analysis of Frames

Hoeinzadeh Asl, Masoud | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42211 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. Inelastic analysis of frames is considered in many researches to obtain the capacity of strength and deformation and also to predict of their realistic behavior. The yielded inelastic zones in the frames, usually occur in the limited length of the beams or columns. One of the inelastic analysis methods is the inelastic hinge method, where the inelastic behavior of elements is concentrated at the hinges, while the other regions are assumed to be elastic. Existing in the inelastic zones, the internal forces are not independent from the each other, and against the elastic zones, the interaction among them are important, too. In the present research, by using of the inelastic hinge concept, a new element is introduced for considering the interaction among the internal forces, the post yield softening, strength degredation, stiffness degredation, and large deformations. The inelastic deformations are modeled by using the multi-surfaces approach with dissimilar yield surfaces, and appose to commonly used force space, the deformation space is utilized for the definition of yield surfaces.The PVM element is introduced for considering the interaction between the axial, shear, and flexural deformations. A computer program has been developed based on the presented theories and some examples of steel structures are investigated. The investigation consists of reduced web section beams, and reduced flange section beams moment frames. The comparison between analytical and experimental results shows good agreement. An step by step design method is proposed for reduced web section beam to column connection. The effect of damage on the seismic behavior of frames is also investigated.

  9. Keywords:
  10. Reduced Web Beam ; Sheer and Moment Interaction ; Strength and Stiffness Degredation ; Mixed Hinge ; Deformation Space

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