Investigating the effect of soil-structure interaction on the seismic performance of buildings having medium flexural frame with mass irregularity

Document Type : Original Article

Authors

1 Associate professor, Department of civil Engineering, Faculty of Technical and Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

2 Graduate student, Department of civil Engineering, Faculty of Technical and Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

10.22065/jsce.2023.404764.3162

Abstract

The present paper investigates the seismic performance of mid-range steel bending frame structures that are designed according to Iranian code and valid foreign regulations. For this purpose, 6- and 9-story structures on C-type soil have been designed for Tehran region, which has a very high earthquake risk zone. Assuming that the investigated systems were implemented on soil type C or wrongly on soil type D, the time history analyses under 22 records far from the fault in terms of soil-structure interaction and mass irregularity in height at two earthquake levels DBE and MCE is considered. These structures have been simulated in OpenSees finite element software. In the desired structural models, the nonlinear behaviour of geometry and materials is considered. The results showed that considering the effects of soil-structure interaction in the 6-story structure did not have a significant effect on the responses of the structure, while these effects are evident in the 9-story structure, and by changing the type of soil from state C to state D, more responses were created in the structure. The effects of mass irregularity can greatly increase the values of structural responses in two 6- and 9-story structures. In general, considering the type of local soil (type D instead of C), the values of relative displacements, acceleration and shear of the floors have increased by 1.5 times and sometimes with the increase in the number of floors of the structure and the creation of flexibility effects in the foundation, it increases up to 2 times.

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History

  • Receive Date: 07 July 2023
  • Revise Date: 22 August 2023
  • Accept Date: 03 September 2023

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