An experimental investigation of ring footings resting on granular material subject to combined V-H-M loading

Document Type : Research Article


1 civil engineering dept, faculty of engineering, ferdowsi university of mashhad

2 Civil Engineering Dept. Ferdowsi University of Mashhad


In some structures, such as oil platforms and wind turbines, depending on the type of utilization, the footing is subjected to combined vertical load, horizontal load, and bending moment (V-H-M). In this study, the behavior of the ring footings resting on sand subjected to combined V-H-M loading is experimentally investigated by conducting 100 tests using six load paths. Three values for the diameter ratio of the ring footing models are assumed, including n=0.2, 0.4, and 0.6, along with a circular foundation (n=0). The failure points were determined, on the basis of load-settlement diagrams, and by using the set of these points, the failure envelope was plotted in the vertical load-horizontal load, vertical load-bending moment, and horizontal-bending moment spaces. This failure envelope follows a parabolic curve in V-H and V-M/B spaces. The results indicate a parabolic curve for the failure envelope in V-H and V-M/B spaces which is dependent upon the diameter ratio. Moreover, the most efficient of a ring footing during eccentric or inclined loading takes place when n is within a range from 0.2 to 0.4.


Main Subjects

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