ABSTRACT
The earthquake induced inertia force of the soil mass underneath a footing has significant influence on the bearing capacity of the footing. In this paper, the seismic bearing capacity of shallow strip footings near sloping ground is derived by means of the limit equilibrium technique with composite sliding surfaces formed by linear components and log-spiral curve. The horizontal loading is defined in terms of seismic coefficient, k, and is considered as a constant within the possible sliding wedges for simplicity, although it may vary due to the geometry of the slope and the presence of the foundation. The effect of the excess pore water pressure generated by the shaking is not included in this analysis. We consider the bearing capacity factors Nq, Nc, Nγ , separately and some results are compared when the effect of q & y are included simultaneously. The result is presented in tabular form for easy use by designers. It is obvious that under some circumstances the slope may itself be under limit equilibrium condition without any disturbing load coming from a footing. This fact is taken into consideration in this analysis.
