Investigation on Nonlinear Behavior of base Plates with Triangular Hardener under Axial Load and Bending Moment

Sheibani, Mehran | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51426 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moghaddam, Hassan
  7. Abstract:
  8. The paper presents the results of nonlinear analysis of steel base plates subjected to different combinations of axial and bending forces. The bending forces range from small moments representing small eccentricities to large moments from seismic actions. The results of nonlinear analysis are done on three samples of the column base plate with large moment, small moment and compression axial force are compared to the results of the code. The parameters investigated in this study are as follows: distribution of strain and stresses in the concrete foundation and the steel plate, the strains and stresses in the tensile anchorage bolts, the location of neutral curve under the base plate, the centre of compressional reaction forces in concrete, the flextural rigidity of the base plate connection, and flextural strength as a function of the thickness and the tensile strength of the steel base plate. The results are compared with the provisions of some existing codes such as AISC 2006. It is concluded that, in general, the code provisions underestimate the strength of base plates. This in turn results in using thicker base plates. It is also shown that there is a noticeable discrepancy between the pattern assumed in current practice for the distribution of compressive stresses in concrete and the results of the nonlinear FE analysis as presented in this paper.Among the existing design methods, The triangular distribution method, in comparison to the uniform distribution, obtains a lower thickness for column base plate, But it gives you more tensile strength for Anchor bolts. In general, the closest answer to the finite element analysis is the uniform distribution method of the code
  9. Keywords:
  10. Base Plate ; Finite Element Analysis ; Bending Strength ; Stress Distribution ; Eccentric Loading ; Axial Load ; Performance Evaluation

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