Effects of horizontal and vertical seismic loads on the bearing capacity of a surface footing adjacent to a slope

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Abstract

The correction factor (ζie) 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, kh and kv, respectively, was derived using a modified Janbu's slice method. The influence of slope angles 'α' on the values of 'ζie' are studied here. It was found that the values of ζie can be expressed as an exponential function of 'kh/ (1 - kv)' and 'α' with a measurable interdependency between 'α' and 'ζie'. The influence of V on the value of 'ζie' increases as the input value of 'kh/(1 - kv)' 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.

Original languageEnglish
Pages (from-to)249-258
Number of pages10
JournalSoils and Foundations
Volume49
Issue number2
DOIs
Publication statusPublished - 2009 Apr

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

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