A Hybrid Seismic Design Method for Steel Irregular Space Moment Resisting Frames

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A Hybrid Seismic Design Method for Steel Irregular Space Moment Resisting Frames. / Tzimas, Angelos S.; Skalomenos, Konstantinos A.; Beskos, Dimitri E.

In: Journal of Earthquake Engineering, 13.03.2020.

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@article{57c57bc6f02b4c17b93bc8c391a6ccf4,
title = "A Hybrid Seismic Design Method for Steel Irregular Space Moment Resisting Frames",
abstract = "A performance-based hybrid force/displacement (HFD) seismic design method for space steel moment resisting frames irregular in plan view and in elevation is developed. Irregularity in elevation is either due to non-uniform distribution of mass or due to the presence of setbacks along the height of the frame. More specifically, 30 different frames irregular in plan view for the first case (plan-irregularities), 40 frames with setbacks (vertical stiffness irregularities) for the second case, and 18 frames with mass discontinuities (vertical mass irregularities) at the first, intermediate and top storey for the third case are considered. All these frames are designed according to Eurocodes 3 and 8 and subjected to 42 pairs of ordinary ground motions. Through nonlinear seismic analyses, seismic response databanks for these three types of irregular frames are generated corresponding to four performance levels. These databanks are then utilized for the development of simple expressions that determine the behavior (or strength reduction) factors of the frames. These are functions of frames geometrical/dynamic characteristics including measures of their irregularities as well as the target maximum interstorey drift ratio and member local ductility. The proposed design method, even though it is mainly a force-based design method, controls deformation and therefore damage through the proposed deformation-controlled behavior factors. Design examples are presented to validate the effectiveness of the method to account for the irregularity effects on the preliminary design stage while time-history analysis results demonstrate its advantages to control better the inelastic response of the frames over the conventional force-based seismic design method of Eurocode 8.",
keywords = "behavior factors, deformation control, frames with setbacks, hybrid force/displacement design, mass irregular heightwise frames, plan view irregular frames, space moment resisting frames, Steel space frames",
author = "Tzimas, {Angelos S.} and Skalomenos, {Konstantinos A.} and Beskos, {Dimitri E.}",
note = "Publisher Copyright: {\textcopyright} 2020, {\textcopyright} 2020 Taylor & Francis Group, LLC. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",
year = "2020",
month = mar,
day = "13",
doi = "10.1080/13632469.2020.1733140",
language = "English",
journal = "Journal of Earthquake Engineering",
issn = "1363-2469",
publisher = "Taylor & Francis",

}

RIS

TY - JOUR

T1 - A Hybrid Seismic Design Method for Steel Irregular Space Moment Resisting Frames

AU - Tzimas, Angelos S.

AU - Skalomenos, Konstantinos A.

AU - Beskos, Dimitri E.

N1 - Publisher Copyright: © 2020, © 2020 Taylor & Francis Group, LLC. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/3/13

Y1 - 2020/3/13

N2 - A performance-based hybrid force/displacement (HFD) seismic design method for space steel moment resisting frames irregular in plan view and in elevation is developed. Irregularity in elevation is either due to non-uniform distribution of mass or due to the presence of setbacks along the height of the frame. More specifically, 30 different frames irregular in plan view for the first case (plan-irregularities), 40 frames with setbacks (vertical stiffness irregularities) for the second case, and 18 frames with mass discontinuities (vertical mass irregularities) at the first, intermediate and top storey for the third case are considered. All these frames are designed according to Eurocodes 3 and 8 and subjected to 42 pairs of ordinary ground motions. Through nonlinear seismic analyses, seismic response databanks for these three types of irregular frames are generated corresponding to four performance levels. These databanks are then utilized for the development of simple expressions that determine the behavior (or strength reduction) factors of the frames. These are functions of frames geometrical/dynamic characteristics including measures of their irregularities as well as the target maximum interstorey drift ratio and member local ductility. The proposed design method, even though it is mainly a force-based design method, controls deformation and therefore damage through the proposed deformation-controlled behavior factors. Design examples are presented to validate the effectiveness of the method to account for the irregularity effects on the preliminary design stage while time-history analysis results demonstrate its advantages to control better the inelastic response of the frames over the conventional force-based seismic design method of Eurocode 8.

AB - A performance-based hybrid force/displacement (HFD) seismic design method for space steel moment resisting frames irregular in plan view and in elevation is developed. Irregularity in elevation is either due to non-uniform distribution of mass or due to the presence of setbacks along the height of the frame. More specifically, 30 different frames irregular in plan view for the first case (plan-irregularities), 40 frames with setbacks (vertical stiffness irregularities) for the second case, and 18 frames with mass discontinuities (vertical mass irregularities) at the first, intermediate and top storey for the third case are considered. All these frames are designed according to Eurocodes 3 and 8 and subjected to 42 pairs of ordinary ground motions. Through nonlinear seismic analyses, seismic response databanks for these three types of irregular frames are generated corresponding to four performance levels. These databanks are then utilized for the development of simple expressions that determine the behavior (or strength reduction) factors of the frames. These are functions of frames geometrical/dynamic characteristics including measures of their irregularities as well as the target maximum interstorey drift ratio and member local ductility. The proposed design method, even though it is mainly a force-based design method, controls deformation and therefore damage through the proposed deformation-controlled behavior factors. Design examples are presented to validate the effectiveness of the method to account for the irregularity effects on the preliminary design stage while time-history analysis results demonstrate its advantages to control better the inelastic response of the frames over the conventional force-based seismic design method of Eurocode 8.

KW - behavior factors

KW - deformation control

KW - frames with setbacks

KW - hybrid force/displacement design

KW - mass irregular heightwise frames

KW - plan view irregular frames

KW - space moment resisting frames

KW - Steel space frames

UR - http://www.scopus.com/inward/record.url?scp=85081620472&partnerID=8YFLogxK

U2 - 10.1080/13632469.2020.1733140

DO - 10.1080/13632469.2020.1733140

M3 - Article

AN - SCOPUS:85081620472

JO - Journal of Earthquake Engineering

JF - Journal of Earthquake Engineering

SN - 1363-2469

ER -