Effect of interface characteristics on the influence coefficients of an embedded circular footing under horizontal and moment loading |
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Authors: | Djillali Amar Bouzid Pieter A Vermeer |
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Institution: | (1) Department of Civil Engineering, Engineering Institute, University Yahia Fares of Médéa, Quartier Ain d’Hab, Medea, 26000, Algeria;(2) Geotechnical Institute, University of Stuttgart, Pfaffenwaldring 35, Stuttgart, 70569, Germany |
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Abstract: | By means of a semi-analytical FE approach an embedded circular footing under monotonic horizontal and moment loading is studied.
In a non-homogeneous soil whose shear modulus is characterized by a power law variation with depth, horizontal, rocking and
coupled modes of displacement, expressed in terms of influence factors are thoroughly examined. The exponent α that controls
the shape of the stiffness variation with depth is termed shear modulus factor. Surface influence coefficients are considered
for the situations where the interface between the soil and the footing is either perfectly rough or perfectly smooth. First,
results of semi-analytical FE analysis in the case of rough footing are established and compared with those of another numerical
method. Results of comparison show good agreement. Then, for different values of α the surface influence coefficients are
presented for an embedded footing in perfect smooth contact with soil. The metacentre is referred to as the depth at which
there is no coupling between the sliding and the rocking modes of footing deformations. Expressions for location and horizontal
influence coefficient corresponding to this particular depth are developed and their variations with α examined. The paper
finishes by showing the effect of interface conditions on the soil normal stresses developed beneath the embedded circular
footing for the case of loading applied at the footing top. |
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Keywords: | Semi-analytical approach Interface elements Embedded circular footing Influence coefficients Non-homogeneous soil |
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