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RISS 인기검색어
- 검색키워드
- 저자 : M. Veiskarami (검색결과 3 건)
- 무료
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- 유료
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Effect of Stress Level on the Bearing Capacity Factor, Nγ , by the ZEL Method
M. Jahanandish,M. Veiskarami,A. Ghahramani 대한토목학회 2010 KSCE Journal of Civil Engineering Vol.14 No.5
It has been known that soil shear strength parameters are stress level dependent. On the other hand, foundation size has a significant effect on the level of imposed stress on subsoil elements. In this study, the Zero Extension Lines (ZEL) method, which has wide applications in determination of bearing capacity and load-displacement behavior of foundations and retaining walls, is employed to consider the stress level dependent nature of soil shear strength parameters to predict the actual bearing capacity of foundations. The ZEL equations which are capable of considering variations in soil shear strength parameters have been employed to consider their dependency on stress level and solved numerically by a computer code developed for this study. The presented approach has been compared with experimental data showing reasonable predictions when the effect of stress level is taken into account. It is then utilized to develop some design charts showing modified values of Nγ , as a function of foundation size and soil properties based on Bolton (1986) equation for stress level effect in cases of smooth and rough base foundations. The charts represent the decreasing tendency in Nγ with an increase in foundation size and it shows the decreasing tendency in the reduction rate when the foundation size increases.
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Stress Level Based Bearing Capacity of Foundations: Verification of Results with 131 Case Studies
M. Veiskarami,M. Jahanandish,A. Ghahramani 대한토목학회 2012 KSCE Journal of Civil Engineering Vol.16 No.5
Evidence of decreasing magnitude in the bearing capacity factor, Nγ , in shallow foundations requires a different strategy rather than taking a constant soil friction angle conventionally used in computation of this factor. Because of the influence of stress level on soil friction angle, a more complex analysis may be required to compute the values of Nγ since the mobilized soil friction angle at failure differs from point to point beneath shallow foundations corresponding to the experienced level of stress. This can be performed by taking a variable field of mobilized soil maximum friction angle which can be achieved by the aid of the Zero Extension Lines (ZEL)equations. It has been realized by the authors in developing design charts in which, variations of Nγ with foundation size have been presented by the stress level based ZEL method. Following previous attempts, this research is devoted to extending these charts to circular foundations and furthermore, to provide an in depth investigation of the possibilities and advantages of using these charts. A comprehensive foundation load test database has been collected and recompiled for this research to compare the predictions made by the ZEL method in the suggested design charts with field data. The predictions by these design charts show a reasonable coverage over the entire range of selected case studies presented in this research.
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Micromechanical analysis of unidirectional polymeric composites material with triangular fibers
F. Barati,E. Torabi,H. Veiskarami,A. Khanbabaea Nava,M. M. Attar 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
The purpose of this study is to investigate the mechanism of load transfer in unidirectional polymeric composites material with triangular fibers in the presence of broken fibers. It is assumed that all fibers with triangle-cross section lie in a same direction while loaded by a load at infinity. In previous studies, the behavior of polymeric matrix is assumed elastic, while the behavior of most polymeric matrix is elastic-perfect plastic. For this purpose, equilibrium equations by use of shear-lag theory have been derived and by proper using boundary and boundness conditions, displacement field and stress distribution were computed. Finally, the results of stress concentrations and di shear stress, at neighbor of broken fibers for carbon-epoxy composite material were extracted and compared with composite materials with circular fibers. The analytical results are compared to the detailed finite element values. A close match is observed between the two methods.
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