Performance Based Plastic Design of Steel Moment Frame and Comparing It with Force Based Design

Document Type : Research Article

Authors

1 Civil engineering department, faculty of engineering, University of Kashan

2 Civil engineering department, Faculty of engineering, University of Kashan, Kashan, Iran.

Abstract

In conventional seismic design methods the performance of structure has not been considered in base shear estimation and structural drift, as a measure of damage, will be checked at the end of design stages. This weakness of force-based design (FBD) methods causes special attention to performance-based design. Performance-based plastic design (PBPD) is of performance-based design (PBD) in which the desired damage level and plastic mechanism of the structure are predefined at the beginning of the design procedure, to estimate internal forces. It is expected that applying PBPD ends to a structural behavior with more compliance with the desired mechanism. In this paper, the priority of PBPD over FBD has been investigated. The PBPD and FBD methods are applied to the design of four special steel moment frames of 4, 8, 12, and 16 stories. The nonlinear behavior of designed structures has been evaluated by push-over and nonlinear time history analysis. Analysis results show that the PBPD frame has mechanism mode closer to assumed mechanism mode in the design procedure. Another conclusion is that the PBPD frame mechanism in the push-over analysis is more ductile than the FBD frame. Also, it concluded that in the PBPD frame, plastic hinges are approximately distributed uniformly all over the structure. The general reason for PBPD ductility improvement, versus FBD, is the strength of columns which prevent undesirable mechanism.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 2
May 2021
Pages 515-534

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