A hybrid force/displacement seismic design method for steel building frames

Tzimas, Angelos S.; Karavasilis, Theodore L.; Bazeos, Nikitas; Beskos, D.E.

doi:10.1016/j.engstruct.2013.07.014

Cited by 27 publications

(54 citation statements)

References 15 publications

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“…These steps are based on those described in Tzimas et al [39] for the case of steel frames, appropriately modified and extended to the present case of composite steel/concrete frames. Thus, the proposed hybrid force/displacement (HFD) seismic design procedure can be summarized in the following steps:…”

Section: The Hfd Methodsmentioning

confidence: 99%

“…The results demonstrate the advantages of the proposed method over the force-based seismic design procedure of EC8 [6]. Finally, CFT-MRFs are designed on the basis of the HFD method using equations developed here according to the assumptions of the HFD of Tzimas et al [39] in order to be compared on an equal basis with the pure steel frames considered in the study of Tzimas et al [39]. The comparison results lead to useful conclusions concerning the seismic design and behavior of CFT-MRFs.…”

Section: Introductionmentioning

confidence: 99%

“…This methodology combines the advantages of the well-known force-based and displacement-based seismic design methods in a hybrid force/ displacement (HFD) design scheme and works in a PBD framework. The method has been proposed in the preliminary work of Karavasilis et al [33] and evolved by extensive parametric studies of the authors [34][35][36][37][38] to reach its final stage dealing with plane steel frames of various kinds [39]. Herein, the HFD method is extended to CFT-MRFs and applied to realistic design examples of CFT-MRFs using the formulae proposed by Skalomenos et al [40] and those presented here, which are based on a more refined modeling than in Tzimas et al [39].…”

Section: Introductionmentioning

confidence: 99%

“…The method has been proposed in the preliminary work of Karavasilis et al [33] and evolved by extensive parametric studies of the authors [34][35][36][37][38] to reach its final stage dealing with plane steel frames of various kinds [39]. Herein, the HFD method is extended to CFT-MRFs and applied to realistic design examples of CFT-MRFs using the formulae proposed by Skalomenos et al [40] and those presented here, which are based on a more refined modeling than in Tzimas et al [39]. Furthermore, comparisons with CFT-MRFs designed according to the FBD method are made on the basis of nonlinear time-history analyses of the designed frames under ten semi-artificial accelerograms for three performance levels.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Application of the hybrid force/displacement (HFD) seismic design method to composite steel/concrete plane frames

Skalomenos

Hatzigeorgiou

Beskos

2015

Journal of Constructional Steel Research

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Section: The Hfd Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of the hybrid force/displacement (HFD) seismic design method to composite steel/concrete plane frames

Skalomenos

Hatzigeorgiou

Beskos

2015

Journal of Constructional Steel Research

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“…Previous studies on seismic design and evaluation of conventional seismic-resistant systems, such as steel moment-resisting frames (MRFs) [1][2][3], showed that these systems experience significant inelastic deformations in structural members under the design basis earthquake (DBE; 475 yrs return period) [4]. Inelastic deformations result in structural damage and residual drifts, and therefore, in economic losses such as repair costs and downtime.…”

Section: Introductionmentioning

confidence: 99%

EC8-based seismic design and assessment of self-centering post-tensioned steel frames with viscous dampers

Tzimas

Dimopoulos

Karavasilis

2015

Journal of Constructional Steel Research

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Original citation: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. Copies of full items can be used for personal research or study, educational, or not-forprofit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. ABSTRACTThis 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 SCMRFs. 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.

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A Damage‐Controlled Behavior Factor (EC8) for Seismic Design of Steel Irregular Space MRFs

Tzimas

Skalomenos²,

Beskos

2021

ce papers

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A main aspect to consider in seismic design of building structures according to EC8 is the selection of the behavior factor, q, which is directly related to the energy dissipation capacity of the structure. The prescribed values of q (1) are referred only to one limit state; (2) depend on the structural system and on the ductility class; (3) are constant; and (4) are not directly related to structural and non‐structural demands. Based on the literature, the inelastic seismic response of irregular building structures cannot be always estimated with safety by utilizing the methods of current seismic design codes. In this work, a preliminary performance‐based seismic design method which incorporates deformation‐controlled q factors, to better control the structural and non‐structural damage, is developed for space steel moment resisting frames irregular in plan view and in elevation within the framework of hybrid force/displacement (HFD) seismic design method. A large seismic response databank is generated on the basis of 88 space irregular MRFs, subjected to 42 pairs of ordinary ground motions, to develop the necessary empirical equations employed by the HFD. A realistic design example serves to demonstrate the advantages of the proposed method over the seismic design procedure of EC8.

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A hybrid force/displacement seismic design method for steel building frames

Cited by 27 publications

References 15 publications

Application of the hybrid force/displacement (HFD) seismic design method to composite steel/concrete plane frames

Application of the hybrid force/displacement (HFD) seismic design method to composite steel/concrete plane frames

EC8-based seismic design and assessment of self-centering post-tensioned steel frames with viscous dampers

A Damage‐Controlled Behavior Factor (EC8) for Seismic Design of Steel Irregular Space MRFs

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