ULTIMATE SEISMIC BEARING CAPACITY OF STRIP FOOTING USING MODIFIED KREYโS METHODS (FRICTION CIRCLE METHOD) | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 8, Volume 42, No 1, January and February 2014, Page 129-148 PDF (768.17 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2014.114294 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| AbdelAziz Ahmed Ali Senoon | ||||
| Civil Eng. Dept., Faculty of Eng., Assiut University, Assiut , Egypt | ||||
| Abstract | ||||
| In geotechnical investigation, determination oftheseismic bearing capacity of foundation soil constitutes an important task. The bearing capacity of soil under static loading has been extensively studied since the early work of Prandtl (1921).Design of foundation in seismic areas needs special considerations compared to the static case. The inadequate performance of structure during recent earthquake has motivated researches to revise existing methods and to develop new method for seismic resistant design. For foundation of structure built in seismic areas the demands to sustain load and deformation during earthquake will probably be the severe in their design life. Due to seismic loading foundation may experience decreases in bearing capacity and increases in settlement. Two source of loading must be taken into consideration inertial loading caused by lateral forces imposed on the superstructure, kinematic loading caused by the ground movement developed during earthquake. Many techniques used for studying the effect of seismic forces on the soil bearing capacity such as, limit equilibrium method, kinematic approach of yield theory, a variational approach, and unified theory of stress, which the shape of failure surface has been assumed. The seismic forces are considered as pseudostatic forces acting both on the footing and on the soil under the footing. However, finite element and stress characteristics methods shape of the failure is not required to be assumed. In the present paper, a theoretical analysis has been performed on the basis of Krey's method (friction circle method) with radius of friction circle equal to = ๐ sin (∅ − tan−1 ๐โ 1−๐๐ฃ )where r is the radius of the circle slip surface to determine the influence of the earthquake acceleration coefficients on the seismic bearing capacity of foundation with assisted by a computer program. The present study is compared with the various theoretical solutions. The comparison of that the present study predicted values of ultimate seismic bearing capacity of soil are less than others theories of ultimate seismic bearing capacity. In order facilitate the calculation of seismic bearing capacity, using the proposed equations. It is a function of (B, Rf, , tan ∅ , ๐โ and c) | ||||
| Keywords | ||||
| Seismic Ultimate bearing capacity; strip footing; mechanism of failure; Centre location of slip failure; shape of slip failure; Kreyโs method | ||||
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