Pseudo-static uplift capacity of inclined strip anchor in cohesionless soil.

Abstract

In this paper, an analytical method is described to compute the uplift capacity of inclined strip anchors under both static and seismic conditions. The pseudo-static approach is used with the limit equilibrium method to obtain the net seismic uplift capacity factor for unit weight component (Fγd) for inclined strip anchor in cohesionless soil. Kötter's equation is used to obtain the distribution of soil reaction on the assumed simplest planer failure surface. The influence of input parameters like anchor inclination, soil friction angle, embedment ratio, horizontal and vertical seismic acceleration coefficients are discussed in estimation of Fγd.. It is observed that orientation of anchor significantly affects the seismic uplift capacity of inclined strip anchor. The seismic uplift capacity of inclined strip anchor decreases with increase in seismic acceleration coefficients whereas, increases with increase in soil friction angle and embedment ratio, as expected, even under the seismic condition. The results in terms of non-dimensional seismic uplift capacity factor are presented in graphical and tabular form for the different orientations of inclined strip anchor which can be used for design purpose. Present results are compared with the available results in literature for some specific cases and found in good agreement.