Tzimas, Angelos S., Dimopoulos, Athanasios I. and Karavasilis, Theodore L. (2015) EC8-based seismic design and assessment of self-centering post-tensioned steel frames with viscous dampers. Journal of Constructional Steel Research, Volume 105 . pp. 60-73. doi:10.1016/j.jcsr.2014.10.022 ISSN 0143-974X.

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Abstract

This paper focuses on seismic design and assessment of steel self-centering moment-resisting frames (SC-MRFs) with viscous dampers within the framework of Eurocode 8 (EC8). Performance levels are defined with respect to drifts, residual drifts and limit states in the post-tensioned (PT) connections. A preliminary pushover analysis is conducted at the early phase of the design process to estimate rotations and axial forces in post-tensioned (PT) connections instead of using approximate formulae. Different designs of an SC-MRF with viscous dampers are considered to investigate all possible scenarios, i.e. use of dampers to achieve drifts significantly lower than the EC8 drift limit; to significantly reduce steel weight without exceeding the EC8 drift limit; or to reduce steel weight and achieve drifts lower than the EC8 drift limit. Nonlinear dynamic analyses using models capable of simulating all structural limit states up to collapse confirm the minimal-damage performance of the SC-MRFs. It is shown that the use of the preliminary pushover analysis makes the design procedure very accurate in predicting structural and non-structural limit states. Supplemental damping along with strict design criteria for the post-tensioned connections are found to significantly improve the seismic performance of the SC-MRFs. Moreover, the paper shows that SC-MRFs with viscous dampers have superior collapse resistance compared to conventional steel MRFs even when the SC-MRF is significantly lighter than the conventional MRF.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Post-tensioned prestressed concrete, Earthquake resistant design
Journal or Publication Title:	Journal of Constructional Steel Research
Publisher:	Elsevier Ltd.
ISSN:	0143-974X
Official Date:	February 2015
Dates:	Date Event February 2015 Published 19 November 2014 Available 24 October 2014 Accepted 22 May 2014 Submitted
Volume:	Volume 105
Number of Pages:	14
Page Range:	pp. 60-73
DOI:	10.1016/j.jcsr.2014.10.022
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	29 December 2015
Date of first compliant Open Access:	29 December 2015
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
Grant number:	EP/K006118/1 (EPSRC)

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