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Dynamic Bearing Capacity of Shallow Foundation Under Earthquake Force
Abstract Prevailing practice for computation of bearing capacity of soil under seismic force allows for an increase in its allowable capacity by a factor of 1.25 as recommended in a number of codes around the world. However research and post reconnaissance survey of structures after earthquake shows contradicting evidence to the abovementioned assumption. A number of researchers have thus tried to develop the dynamic bearing capacity factors (Nc, Nq, N) under seismic loading to establish a realistic mathematical model for estimation of ultimate bearing capacity based on assumption that the seismic force is pseudo-static in nature. Present paper attempts to develop a mathematical model based on modal response analysis that shows that bearing capacity of soil varies with mode and actually there are nothing called dynamic bearing capacity factors. The allowable bearing capacity under service load condition is actually augmented by the vibrating soil mass and goes on to reduce the factor of safety provided to the ultimate bearing capacity and under conducive conditions can well reduce the factor of safety below 1.0 inducing failure to the foundation.
Dynamic Bearing Capacity of Shallow Foundation Under Earthquake Force
Abstract Prevailing practice for computation of bearing capacity of soil under seismic force allows for an increase in its allowable capacity by a factor of 1.25 as recommended in a number of codes around the world. However research and post reconnaissance survey of structures after earthquake shows contradicting evidence to the abovementioned assumption. A number of researchers have thus tried to develop the dynamic bearing capacity factors (Nc, Nq, N) under seismic loading to establish a realistic mathematical model for estimation of ultimate bearing capacity based on assumption that the seismic force is pseudo-static in nature. Present paper attempts to develop a mathematical model based on modal response analysis that shows that bearing capacity of soil varies with mode and actually there are nothing called dynamic bearing capacity factors. The allowable bearing capacity under service load condition is actually augmented by the vibrating soil mass and goes on to reduce the factor of safety provided to the ultimate bearing capacity and under conducive conditions can well reduce the factor of safety below 1.0 inducing failure to the foundation.
Dynamic Bearing Capacity of Shallow Foundation Under Earthquake Force
Chowdhury, Indrajit (author) / Dasgupta, Shambhu P. (author)
Indian Geotechnical Journal ; 47 ; 35-46
2016-10-11
12 pages
Article (Journal)
Electronic Resource
English
Dynamic Bearing Capacity of Shallow Foundation Under Earthquake Force
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