Earthquakes and Structures

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Mitigation of seismic pounding between RC twin high-rise buildings with piled raft foundation considering SSI

  • Farghaly, Ahmed Abdelraheem (Department of Civil and Architectural Constructions, Faculty of Technology and Education, Sohag University) ;
  • Kontoni, Denise-Penelope N. (Department of Civil Engineering, School of Engineering, University of the Peloponnese)
  • Received : 2018.05.10
  • Accepted : 2022.06.12
  • Published : 2022.06.25
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Abstract

High-rise buildings (HRBs) are considered one of the most common structures nowadays due to the population growth, especially in crowded towns. The lack of land in crowded cities has led to the convergence of the HRBs and the absence of any gaps between them, especially in lands with weak soil (e.g., liquefaction-prone soil), but then during earthquakes, these structures may be exposed to the risk of collision between them due to the large increase in the horizontal displacements, which may be destructive in some cases to the one or both of these adjacent buildings. To evaluate methods of reducing the risk of collision between adjacent twin HRBs, this research investigates three vibration control methods to reduce the risk of collision due to five different earthquakes for the case of two adjacent reinforced concrete (RC) twin high-rise buildings of 15 floors height without gap distance between them, founded on raft foundation supported on piles inside a liquefaction-prone soil. Contact pounding elements between the two buildings (distributed at all floor levels and at the raft foundation level) are used to make the impact strength between the two buildings realistic. The mitigation methods investigated are the base isolation, the tuned mass damper (TMD) method (using traditional TMDs), and the pounding tuned mass damper (PTMD) method (using PTMDs connected between the two buildings). The results show that the PTMD method between the two adjacent RC twin high-rise buildings is more efficient than the other two methods in mitigating the earthquake-induced pounding risk.

Keywords

References

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