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Evaluation of Pseudo Static coefficient for Soil nailed walls on the basis of Seismic behavior levels

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Author Affiliations

  • 1 Department of Civil Eng., Tarbiat Modares University, Tehran- 14115-111, IRAN
  • 2 Department of Civil Engineering, Parsian University, Qazvin- 14115-111, IRAN

Res. J. Recent Sci., Volume 3, Issue (11), Pages 6-16, November,2 (2014)

Abstract

The dependency of seismic behavior of geotechnical structures specifically soil nailed walls to the primary parameters of earthquakes, geotechnical parameters, and geometrical configuration and The independency of pseudo static method from factors affecting seismic behavior of the structures are the main deficiencies of this method. In this study, in order to modify the pseudo static method on the basis of seismic behavior of soil nailed walls, it has been tried to define the pseudo static coefficient as a function of main parameters of earthquakes, soil mass, and geometry of the structure. To do so, among the important factors of earthquakes (maximum acceleration, predominant period, effective time, magnitude), the predominant period and among geotechnical and geometrical characteristics (height of structure, length of nails, horizontal and vertical distance between of nails, geotechnical properties of soil, angel of slope), the height of structure have been picked up as primarily parameters. To choose appropriate coefficient for the specific earthquake record, and geotechnical and geometrical characteristics, the behavior of soil nailed walls in two modes of dynamic and pseudo static seismic behavior have been synchronized for wall horizontal displacements. Afterwards, pseudo static coefficient is defined as a function of predominant period and height of structure. Obtained results demonstrate the great impact of height of structure and predominant earthquake period on the pseudo static seismic coefficient. They include the fact that the increase in the height will bring the decrease in the pseudo static coefficient and the highest of coefficients and its variations yields by the natural period of the structure. This highlights the importance of investigating the seismic behavior of soil nailed walls for their natural periods.

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