EFFECTS OF HORIZONTAL AND VERTICAL SEISMIC LOADS ON THE BEARING CAPACITY OF A SURFACE FOOTING ADJACENT TO A SLOPE

概要

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The correction factor (η_<ie>) for the ultimate bearing capacity of a footing placed adjacent to a slope, taking into account the combined effect of horizontal and vertical seismic loads, represented by horizontal and vertical seismic coefficients, k_h, and k_v, respectively, was derived using a modified Janbu's slice method. The influence of slope angles 'α' on the values of 'η_<ie>' are studied here. It was found that the values of η_<ie> can be expressed as an exponential function of 'k_h/(1-k_v)' and 'α', with a measurable interdependency between 'α' and 'η_<ie>'. The influence of 'α' on the value of 'η_<ie>' increases as the input value of 'k_h/(1-k_v)' increases. Equations derived based on the analytical results are proposed to account for this effect. Based on the analyses of 11 near-fault seismographers obtained in the 1999 Chi-Chi earthquake in Taiwan, a ratio between the vertical and the horizontal seismic coefficients, λ, of between ±0.25 is suggested for including the combined effect of vertical and horizontal seismic forces in evaluating the seismic bearing capacity of footings located in near-fault areas.
社団法人地盤工学会の論文