Performance based robust design optimization of steel moment resisting frames

Zhifeng Liu, Sez Atamturktur, C. Hsein Juang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The seismic design of steel-moment resisting frames is subjected to uncertainties originating from various sources including imprecisely known seismic load, inaccurate modeling assumptions, as well as uncertain material properties and connection behavior. These uncertainties must be considered in the structural design process to ensure that a safe design is achieved. Design codes based on reliability of performance are useful in providing safety margins for the performance objectives with quantifiable confidence levels considering various sources of uncertainties. In these design codes, although seismic demand is usually calculated with a suite of ground motions, only the median seismic demand is used in the subsequent calculation of acceptance criterion (i.e., confidence level), and variation in seismic demand is not used. In the present manuscript, the authors utilize a performance based design approach for seismic design optimization of steel moment resisting frames, where material weight, mean value of seismic demand and variation of seismic demand are treated as three design objectives representing the cost, safety and robustness measures, respectively. Through a case study application, the proposed methodology is demonstrated to be capable of providing a set of Pareto-optimal designs with competing cost, safety and robustness. The obtained Pareto front designs are utilized in the development of uniformity drift ratio as design efficiency indicator. Required uniformity drift ratio to ensure efficient designs for each range of maximum inter-story drift is suggested based on the obtained results. Finally, the influence of the selected connection model and the response modification factor on the obtained results is investigated.

Original languageEnglish (US)
Pages (from-to)165-174
Number of pages10
JournalJournal of Constructional Steel Research
Volume89
DOIs
StatePublished - Aug 12 2013

Fingerprint

Steel
Seismic design
Design optimization
Structural design
Costs
Materials properties

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Metals and Alloys

Cite this

@article{4239dc06583a4fe89bf7b0a703df1206,
title = "Performance based robust design optimization of steel moment resisting frames",
abstract = "The seismic design of steel-moment resisting frames is subjected to uncertainties originating from various sources including imprecisely known seismic load, inaccurate modeling assumptions, as well as uncertain material properties and connection behavior. These uncertainties must be considered in the structural design process to ensure that a safe design is achieved. Design codes based on reliability of performance are useful in providing safety margins for the performance objectives with quantifiable confidence levels considering various sources of uncertainties. In these design codes, although seismic demand is usually calculated with a suite of ground motions, only the median seismic demand is used in the subsequent calculation of acceptance criterion (i.e., confidence level), and variation in seismic demand is not used. In the present manuscript, the authors utilize a performance based design approach for seismic design optimization of steel moment resisting frames, where material weight, mean value of seismic demand and variation of seismic demand are treated as three design objectives representing the cost, safety and robustness measures, respectively. Through a case study application, the proposed methodology is demonstrated to be capable of providing a set of Pareto-optimal designs with competing cost, safety and robustness. The obtained Pareto front designs are utilized in the development of uniformity drift ratio as design efficiency indicator. Required uniformity drift ratio to ensure efficient designs for each range of maximum inter-story drift is suggested based on the obtained results. Finally, the influence of the selected connection model and the response modification factor on the obtained results is investigated.",
author = "Zhifeng Liu and Sez Atamturktur and Juang, {C. Hsein}",
year = "2013",
month = "8",
day = "12",
doi = "10.1016/j.jcsr.2013.07.011",
language = "English (US)",
volume = "89",
pages = "165--174",
journal = "Journal of Constructional Steel Research",
issn = "0143-974X",
publisher = "Elsevier BV",

}

Performance based robust design optimization of steel moment resisting frames. / Liu, Zhifeng; Atamturktur, Sez; Juang, C. Hsein.

In: Journal of Constructional Steel Research, Vol. 89, 12.08.2013, p. 165-174.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Performance based robust design optimization of steel moment resisting frames

AU - Liu, Zhifeng

AU - Atamturktur, Sez

AU - Juang, C. Hsein

PY - 2013/8/12

Y1 - 2013/8/12

N2 - The seismic design of steel-moment resisting frames is subjected to uncertainties originating from various sources including imprecisely known seismic load, inaccurate modeling assumptions, as well as uncertain material properties and connection behavior. These uncertainties must be considered in the structural design process to ensure that a safe design is achieved. Design codes based on reliability of performance are useful in providing safety margins for the performance objectives with quantifiable confidence levels considering various sources of uncertainties. In these design codes, although seismic demand is usually calculated with a suite of ground motions, only the median seismic demand is used in the subsequent calculation of acceptance criterion (i.e., confidence level), and variation in seismic demand is not used. In the present manuscript, the authors utilize a performance based design approach for seismic design optimization of steel moment resisting frames, where material weight, mean value of seismic demand and variation of seismic demand are treated as three design objectives representing the cost, safety and robustness measures, respectively. Through a case study application, the proposed methodology is demonstrated to be capable of providing a set of Pareto-optimal designs with competing cost, safety and robustness. The obtained Pareto front designs are utilized in the development of uniformity drift ratio as design efficiency indicator. Required uniformity drift ratio to ensure efficient designs for each range of maximum inter-story drift is suggested based on the obtained results. Finally, the influence of the selected connection model and the response modification factor on the obtained results is investigated.

AB - The seismic design of steel-moment resisting frames is subjected to uncertainties originating from various sources including imprecisely known seismic load, inaccurate modeling assumptions, as well as uncertain material properties and connection behavior. These uncertainties must be considered in the structural design process to ensure that a safe design is achieved. Design codes based on reliability of performance are useful in providing safety margins for the performance objectives with quantifiable confidence levels considering various sources of uncertainties. In these design codes, although seismic demand is usually calculated with a suite of ground motions, only the median seismic demand is used in the subsequent calculation of acceptance criterion (i.e., confidence level), and variation in seismic demand is not used. In the present manuscript, the authors utilize a performance based design approach for seismic design optimization of steel moment resisting frames, where material weight, mean value of seismic demand and variation of seismic demand are treated as three design objectives representing the cost, safety and robustness measures, respectively. Through a case study application, the proposed methodology is demonstrated to be capable of providing a set of Pareto-optimal designs with competing cost, safety and robustness. The obtained Pareto front designs are utilized in the development of uniformity drift ratio as design efficiency indicator. Required uniformity drift ratio to ensure efficient designs for each range of maximum inter-story drift is suggested based on the obtained results. Finally, the influence of the selected connection model and the response modification factor on the obtained results is investigated.

UR - http://www.scopus.com/inward/record.url?scp=84881169380&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881169380&partnerID=8YFLogxK

U2 - 10.1016/j.jcsr.2013.07.011

DO - 10.1016/j.jcsr.2013.07.011

M3 - Article

AN - SCOPUS:84881169380

VL - 89

SP - 165

EP - 174

JO - Journal of Constructional Steel Research

JF - Journal of Constructional Steel Research

SN - 0143-974X

ER -