Earthquakes and Structures

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Slope topography effect on the seismic response of mid-rise buildings considering topography-soil-structure interaction

  • Shabani, Mohammad J. (Department of Civil Engineering, Kharazmi University) ;
  • Shamsi, Mohammad (Department of Civil Engineering, Kharazmi University) ;
  • Ghanbari, Ali (Department of Civil Engineering, Kharazmi University)
  • Received : 2019.11.07
  • Accepted : 2021.02.28
  • Published : 2021.02.25
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Abstract

The main factor for the amplification of ground motions near the crest or the toe of a slope is the reflection of the incident waves. The effects of the slope topography on the surrounding lands over the crest or at the toe can amplify the seismic responses of buildings. This study investigates the seismic performance of the slope topography and three mid-rise buildings (five, ten, and fifteen-storey) located near the crest and toe of the slope by 3D numerical analysis. The nonlinear model was used to represent the real behavior of building and ground elements. The average results of seven records were used in the investigations. Based on the analysis, the amplification factor of acceleration near the crest and toe of the slope was the most effective at distances of 2.5 and 1.3 times the slope height, respectively. Accordingly, the seismic performance of buildings was studied at a distance equal to the height of the slope from the crest and toe. The seismic response results of buildings showed that the slope topography to have little impact on up to five-storey buildings located near the crest. Taking into account a topography-soil-structure interaction system increases the storey displacement and base shear in the building. Accordingly, in topography-soil-structure interaction analyses, the maximum lateral displacement was increased by 71% and 29% in ten and fifteen-storey buildings, respectively, compare to the soil-structure interaction system. Further, the base shear force was increased by 109% and 78% in these buildings relative to soil-structure interaction analyses.

Keywords

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