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- Title
SHEAR BAND CONDITIONS REQUIRED TO DEVELOP THE EQUATION FOR THE ULTIMATE BEARING CAPACITY OF A STRIP FOUNDATION.
- Authors
Tse-Shan Hsu; Zong-Lin Wu; Yu-Chien Wu; Da-Jie Lin; Tsai-Fu Chuang; Yi-Min Huang
- Abstract
Evaluation of the ultimate bearing capacity of a strip foundation requires the incorporation of the shear bands. However, when the applied force reaches the ultimate load, the shear bands that should be induced from localizations of deformations do not appear when expected. In view of this, in this paper, the following four conclusions are drawn based on the characteristics of the solutions of the static equilibrium equation under stable and unstable conditions. (1) Using the plastic strain hardening model or the perfectly plastic model, the elastic-plastic solution is obtained under stable conditions, so shear bands cannot be induced and the structural symmetry is maintained. (2) Using the plastic strain softening model, the elastic-plastic solution is obtained under unstable conditions and with the prescribed displacements, so shear bands are induced and the structural symmetry is lost. (3) In the development of the traditional equation for the ultimate bearing capacity of a strip foundation, the perfectly plastic model, which cannot induce shear bands, is adopted when the incorporation of shear bands is required, so the ultimate bearing capacity that meets the needs of the actual situation cannot be obtained by applying the developed equation. (4) In the case of using the perfectly plastic model, when the foundation load reaches the ultimate load, the plastic strain zone expands in an unduly symmetric manner, and the estimated ultimate bearing capacity of the strip foundation is therefore unduly high. Based on the above four conclusions, it is suggested that future evaluation of the ultimate bearing capacity of strip foundations must adopt the plastic strain softening model. Only in this way will the evaluated ultimate bearing capacity of the strip foundation meet the safety requirements.
- Subjects
STRAIN hardening; EQUATIONS
- Publication
International Journal of Organizational Innovation, 2022, Vol 14, Issue 4, p450
- ISSN
1943-1813
- Publication type
Article