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The effect of prestressing force and interfacial friction on the settlement characteristics of beams on reinforced granular beds



The effect of prestressing force and interfacial friction on the settlement characteristics of beams on reinforced granular beds



Indian Geotechnical Journal 35(3): 283-298



The paper presents a generalized model to idealize and predict the flexural response of a strip footings supporting a wall (imposing a concentrated load) idealized as a beam resting on a compacted granular bed overlying a reinforcing element having finite bending stiffness and frictional resistance e.g. geogrids, geomats etc below which lies a loose in situ soil deposit. The lower strata and the upper soil are replaced with Winkler springs of different stiffness values. The effect of prestressing force on the upper foundation beam as well as lower reinforcing beams and introduction of interfacial friction coefficient between the lower beam and neighboring soil is studied in this work. A general solution procedure is given for the analysis of beams on reinforced beds and the governing differential equations to find the response of the model have been derived. Closed form analytical solutions of the same are found subjected to appropriate boundary and continuity conditions. Various parametric studies show that the interfacial friction coefficient between lower reinforcing beam and the neighboring soil layers does not significantly affect the response of the model and introduction of the prestress force in the beams helps in reducing the deflection of the beams considerably.

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