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conference paper

Concepts to minimize earthquake-induced column axial shortening in steel moment-resisting frames

Inamasu, Hiroyuki  
•
Lignos, Dimitrios  
November 9, 2019
Proceedings of 12th Pacific Structural Steel Conference
12th Pacific Structural Steel Conference

Capacity-designed steel moment-resisting frames (MRFs) dissipate the seismic action through inelastic flexural yielding of protected zones located at the beam ends and the first story column bottom end. During low-probability of occurrence seismic events, flexural yielding is typically followed by local and/or member buckling that could potentially lead to steel MRF global collapse. Experiments of steel columns under cyclic loading underscore the influence of residual axial shortening on the overall column stability. Particularly, residual column axial shortening may cause slab tilting. In turn, the ability for post-earthquake structural repairs in columns may also be significantly compromised. This paper explores an alternative concept aiming to protect the steel MRF column integrity and at the same time minimize axial shortening during an earthquake event. Unlike the traditional seismic design practice, column base connections are designed to dissipate the seismic demands by tuning a stable inelastic dissipation mechanism. The concept is explored by means of nonlinear response history analyses of a case-study steel MRF frame building. Limitations and suggestions for future work are also discussed.

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Type
conference paper
Author(s)
Inamasu, Hiroyuki  
Lignos, Dimitrios  
Date Issued

2019-11-09

Published in
Proceedings of 12th Pacific Structural Steel Conference
Total of pages

8

Subjects

Steel moment-resisting frames

•

Steel columns

•

Axial shortening

•

Residual deformations

•

Column bases

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
RESSLAB  
Event nameEvent placeEvent date
12th Pacific Structural Steel Conference

Tokyo, Japan

November 9-11, 2019

Available on Infoscience
November 10, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/162832
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