Investigating the Effects of Soft Stories on the Behavior of Steel Structures during Earthquakes

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Toghani, Mohammad Saeed | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53778 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Khonsari, Vahid
Abstract:
In this dissertation, a vast number of 2D steel IMFs (Intermediate Moment Frames) with various number of stories and bays, each having one soft storey, of various intensities (ordinary soft storey & extreme soft storey), were studied. The frames were loaded according to ASCE SEI-7-16 and were designed based on AISC-360-10. In order to make a storey softer than others, its height was increased with respect to those of other ones. The dynamic ‘nonlinear spectral analysis,’ and two different static approaches, namely those of ‘ASCE/SEI-7-90’ and ‘ASCE/SEI-7-16,’ were used to study the frames. Comparison of the results obtained from the three aforementioned methods, one dynamic and two static ones, indicates that the use of spectral analysis or other complex methods can be avoided if an appropriate combination of ASCE/SEI7-90 and ASCE/SEI 7-16 formulae is adopted
Keywords:
Equivalent static Analysis ; Soft Story Failure ; Seismic Behavior ; Moment Steel Frames ; Nonlinear Spectral Analysis ; Seismic Design Codes

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