Seismic Bearing Capacity of Strip Footing | |
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( Volume 3 Issue 5,May 2017 ) OPEN ACCESS | |
Author(s): | |
Srijita Dey, Bikash Chandra Chattopadhyay, Joyanta Maity | |
Abstract: | |
At present there are quite a number of available methods, to predict the bearing capacity of a strip footing under dynamic loads, but it is not evident which one of these methods predicts more accurately under a given situation. From the viewpoint of possible earthquake effects, India is divided into four zones, for computing seismic forces, either seismic coefficient method (used for pseudo static design of foundations of buildings & bridges) or response spectrum method (used for the case of earth dam) is used [5]. These forces along with the static forces make the foundation subjected to eccentric inclined load. If the resultant load on the foundation has an eccentricity ‘e’ only in one direction then the dimension of the foundation in that direction is allowed to be reduced by ‘2e’. In this condition it is proposed to study changes of allowable bearing capacity during earthquake for strip footing on sandy soil for various ranges of width of foundation (B), angle of shearing resistance (Φ) of supporting soil and intensity of earthquake from different available theories to check the relativities of such theories. The majority of available solutions in the literature are analytical. Solutions for dynamic bearing capacity for identical foundation were obtained and comparison were made to seek relative differences between the results from such different theories for varying seismic condition. |
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