Behavior of Rigid Footing under Inclined and Eccentric Loading

Pritam Dhar, Soumya Roy, Bikash Chattapadhyay, Pritam Dhar, Soumya Roy, Bikash Chattopadhyay
2013 Annals of Pure and Applied Mathematics   unpublished
It is an important aspect in the design of spread footings to understand the behaviour of surrounding soil when footing are subjected to inclined and eccentric loads.The conventional method of footing design require that footing must possess sufficient safety against failure and settlement must be kept within the allowable value. To have a safe design, the bearing pressure on the underlying ground has to be kept within the allowable bearing values and eccentricity must satisfy the criterion of
more » ... ess than 1/6 of the footing width (e < B/6) so as to avoid tension between the foundation and the soil (Coduto, 2001). Similar condition applies also in case of load having certain inclination with the vertical axis of a footing, conventionally inclination angle, α <. This is the reason why footings subjected to large overturning or rotation also require large footing dimensions which sometimes become uneconomical. This paper presents the results of laboratory model tests on behavior of a model footing resting on Ganga sand under eccentric-inclined load(through load frame for application of inclined-eccentric load at a time, developed by Roy and Chattopadhyay,2011). The ultimate load carrying capacity of a square & rectangular footing resting on surface dense sand bed has been studied. Initially, the behavior of footing subjected to axial load is studied to compare with the shape factors at the for surface footings. The influence of shape of footing on ultimate load carrying capacity due to the different shape of model footings are studied using BCR a non-dimensional factor. The load settlement characteristics of footings of different shapes resting on the surface of sand of same area are also studied through the load settlement curves. To study the effect of eccentricity on ultimate load carrying capacity of footings, model footings are subjected to both one way and two eccentricities. Lastly effect of load inclination with vertical on surface footing is presented in this paper.
fatcat:czu47vuf2zakvbt5tiupkc5tau