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Modified capacity design rule for columns in tall steel MRFs with linear viscous dampers within the framework of Eurocode 8

Modified capacity design rule for columns in tall steel MRFs with linear viscous dampers within the framework of Eurocode 8
Modified capacity design rule for columns in tall steel MRFs with linear viscous dampers within the framework of Eurocode 8

Seismic design codes enforce a set of capacity design rules for steel moment-resisting frames (MRFs) to promote a ductile sway plastic mechanism that involves plastic hinges in beams and column bases. Previous research showed that these capacity design rules may not be effective for tall steel MRFs with viscous dampers under strong earthquakes due to high axial forces in columns. To address this issue, steel MRFs with linear viscous dampers of different stories are designed according to Eurocode 8 along with using a slightly modified conservative capacity design rule. According to this rule, the axial force for the capacity design of a column in the force path of viscous dampers is calculated as the envelope of the axial force from the peak drift state, and, the axial force from the peak velocity state times a scale factor. This envelope axial force value along with the bending moment and shear force from the peak drift state are used to carry out the capacity design of the column by using the formulae of Eurocode 8, i.e. in the same way with a column of a steel MRF without dampers. Incremental dynamic analyses for 44 earthquake ground motions show that the modified conservative capacity design rule results in steel MRFs with viscous dampers that have plastic mechanisms similar to those of steel MRFs without dampers. Moreover, the proposed capacity design rule becomes stricter for buildings with more than 10 stories to address that available analysis methods for structures with dampers underestimate the peak damper forces in the lower stories of yielding tall steel MRFs. More work is needed to extend the findings of this work to the case of steel MRFs with nonlinear viscous dampers.

Capacity design, Eurocode 8, Plastic mechanism, Steel MRFs, Viscous dampers
1570-761X
1-16
Kariniotakis, Konstantinos
64f43aa5-26c2-4951-925a-d837db701844
Karavasilis, Theodore L.
15850eb0-6af4-4b6e-bab4-d5bde281b769
Kariniotakis, Konstantinos
64f43aa5-26c2-4951-925a-d837db701844
Karavasilis, Theodore L.
15850eb0-6af4-4b6e-bab4-d5bde281b769

Kariniotakis, Konstantinos and Karavasilis, Theodore L. (2017) Modified capacity design rule for columns in tall steel MRFs with linear viscous dampers within the framework of Eurocode 8. Bulletin of Earthquake Engineering, 1-16. (doi:10.1007/s10518-017-0230-7).

Record type: Article

Abstract

Seismic design codes enforce a set of capacity design rules for steel moment-resisting frames (MRFs) to promote a ductile sway plastic mechanism that involves plastic hinges in beams and column bases. Previous research showed that these capacity design rules may not be effective for tall steel MRFs with viscous dampers under strong earthquakes due to high axial forces in columns. To address this issue, steel MRFs with linear viscous dampers of different stories are designed according to Eurocode 8 along with using a slightly modified conservative capacity design rule. According to this rule, the axial force for the capacity design of a column in the force path of viscous dampers is calculated as the envelope of the axial force from the peak drift state, and, the axial force from the peak velocity state times a scale factor. This envelope axial force value along with the bending moment and shear force from the peak drift state are used to carry out the capacity design of the column by using the formulae of Eurocode 8, i.e. in the same way with a column of a steel MRF without dampers. Incremental dynamic analyses for 44 earthquake ground motions show that the modified conservative capacity design rule results in steel MRFs with viscous dampers that have plastic mechanisms similar to those of steel MRFs without dampers. Moreover, the proposed capacity design rule becomes stricter for buildings with more than 10 stories to address that available analysis methods for structures with dampers underestimate the peak damper forces in the lower stories of yielding tall steel MRFs. More work is needed to extend the findings of this work to the case of steel MRFs with nonlinear viscous dampers.

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Paper Kariniotakis Karavasilis rev1
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Accepted/In Press date: 16 September 2017
e-pub ahead of print date: 16 September 2017
Keywords: Capacity design, Eurocode 8, Plastic mechanism, Steel MRFs, Viscous dampers

Identifiers

Local EPrints ID: 415125
URI: http://eprints.soton.ac.uk/id/eprint/415125
ISSN: 1570-761X
PURE UUID: 3f76bdda-fcbd-41d1-b31d-aef502ea65f1
ORCID for Theodore L. Karavasilis: ORCID iD orcid.org/0000-0003-2553-5389

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Date deposited: 31 Oct 2017 17:30
Last modified: 07 Oct 2020 06:34

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Author: Konstantinos Kariniotakis
Author: Theodore L. Karavasilis ORCID iD

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