Advanced Steel Construction

Vol. 9, No. 4, pp. 334-349 (2013)


DESIGN MOTIVATION, MECHANICAL MODELING AND NONLINEAR ANALYSIS OF COMPOSITE PR MOMENT FRAMES WITH SMART SMA CONNECTION SYSTEMS

 

Jong Wan Hu

Assistant Professor, Department of Civil and Environmental Engineering, College of Urban Science, University of Incheon, Incheon, 406-840, Republic of Korea (Head of Center, Incheon Disaster Prevention Research Center, University of Incheon, Incheon, 406-840, Republic of Korea) E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Received: 27 March 2012; Revised: 8 July 2012; Accepted:13 July 2012

DOI:10.18057/IJASC.2013.9.4.5

 

ABSTRACT:

This paper focuses on seismic design and behavior of hybrid structures composed of partially restrained (PR) steel-concrete composite-moment frames (C-MFs). The innovative aspects of this research are to introduce new smart connections between steel beams and concrete-filled tube (CFT) columns that utilize a combination of low-carbon steel and shape memory alloy (SMA) components in the C-MF design. In these new connections, we can exploit the recentering effect provided by super-elastic SMA tension bars to reduce both building damage and residual drift after a major earthquake event, while the low-carbon steel components provide excellent energy dissipation. The results of corresponding component tests were used to develop cyclic stiffness models for individual components in the connection. The seismic behavior of the composite moment-resisting frames with new connection systems was reproduced by performing nonlinear pushover and time-history analyses. The analysis results suggest that these frames are very effective in resisting seismic events due to the structural advantages of the smart SMA PR-CFT connections.

 

Keywords:Composite moment frames, Shape memory alloys (SMAs), Partially restrained (PR) connections, Concrete-filled tube (CFT) columns, Stiffness models, Mechanical modeling, Nonlinear frame analyses

 

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