Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Seismic Response of Steel Frame by Considering Soil-Structure Interaction under Seismic Sequence

Document Type : Original Article

Authors
Alireza Karkabadi 1
Mohammad Iman Khodakarami 2
Mostafa Farajian 3
1 MSc Student in Earthquake Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 Assistant Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 PhD Student of Earthquake Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran
10.22065/jsce.2019.173144.1791
Abstract
Seismic sequence as a result of occurrence of strong and moderate earthquake ground motion in a short time strongly affects the seismic response of structures. This kind of excitation causes, in many cases, more deteriorated effects compared to the corresponding single ground motion. The aim of this paper is to investigate the effect of seismic sequence of earthquake ground motion on the seismic responses of steel moment frame structures considering soil-structure interaction (SSI). To this end, four steel moment frames with 8 and 16 stories are considered each of which have three and six bays. Soil-structure-interaction is considered by employing dampers and springs having specified damping and stiffness through cone method. For modelling SSI effects, three types of soil based on standard 2800 are considered.  The time history of responses show that the relative displacement of structure is increased when the structure is subjected to the seismic sequence. As a result, the damage induced to the structure. It is noteworthy to say that the effect of seismic sequence is more in soft soil. The obtained responses show that a special attention should be paid for designing of steel structures in high seismic zone when they are subjected to seismic sequence excitation. Furthermore, soil-structure-interaction is an important parameter that should be considered for such conditions.Therefore, it is recommended that the effects of seismic sequence and soil-structure-interaction should be accounted for better estimation and evaluate accurate responses of steel shear frame.
Keywords
Seismic Sequence
Soil-Structure interaction
Steel frame
frequency content

Subjects

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  • Receive Date 25 February 2019
  • Revise Date 12 May 2019
  • Accept Date 24 May 2019