Accuracy of Advanced Methods for Nonlinear Static Analysis of Steel
Moment-Resisting Frames

Ferraioli, Massimiliano; Avossa, Alberto Maria; Lavino, Angelo; Mandara, Alberto

doi:10.2174/1874836801408010310

Cited by 14 publications

(8 citation statements)

References 26 publications

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“…A design Peak Ground Acceleration PGA=0.35g for Life-Safety Limit State was considered in the analysis. More details about the seismic design and behaviour of the steel frames considered in this paper may be available in Ferraioli et al [8][9][10][11]. At every step of the pushdown analysis, the amount of equivalent load corresponding to each displacement level was expressed by means of the "Load Factor" LF that is the ratio of the vertical load to the full gravity load.…”

Section: Analysis Resultsmentioning

confidence: 99%

06.03: Dynamic increase factor for nonlinear static alternate path analysis of steel moment‐resisting frames against progressive collapse

2017

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The paper investigates the dynamic increase factor to be assumed in the nonlinear pushdown analysis of seismically designed steel moment-resisting frames as a consequence of sudden column removal. The influence of the fundamental parameters, as well as the effect of various design variables, such as the number of stories, the number of bays, the location of the removed column and the level of seismic design load were investigated. The dynamic increase factor was estimated by direct comparison of static analysis with full nonlinear dynamic analysis. Eventually, the values obtained were expressed as a function of the vertical displacement at the location of the removed column and then compared with the GSA formulation based on the ductility factor.

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Section: Analysis Resultsmentioning

confidence: 99%

06.03: Dynamic increase factor for nonlinear static alternate path analysis of steel moment‐resisting frames against progressive collapse

2017

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“…The target displacement * was calculated using the procedure originally proposed by Fajfar [32] and then implemented in Annex B of EC8 [2] and Italian Code [1]. This procedure is equivalent to the capacity spectrum method based on inelastic demand spectra [33], if the reduction rule proposed by Vidic et al [34] to obtain the Inelastic Demand Response Spectrum (IDRS) from the Elastic Demand Response Spectrum (EDRS) is applied. This allows comparing capacity and demand in the spectral plane and calculating the target displacement * for the equivalent SDOF system and the corresponding peak ground acceleration (PGA), according to Annex B of EN 1998-3 [2].…”

Section: Seismic Assessmentmentioning

confidence: 99%

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Design, Construction, and Assessment

Ferraioli

Mandara

2017

Mathematical Problems in Engineering

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The paper deals with the seismic retrofit of a multiple building structure belonging to the Hospital Centre of Avellino (Italy). At first, the paper presents the preliminary investigations, the in situ measurements and laboratory tests, and the seismic assessment of the existing fixed-base structures. Having studied different strategies, base isolation proved to be the more appropriate, also for the possibility offered by the geometry of the building to easily create an isolation interface at the ground level. The paper presents the design project, the construction process, and the details of the isolation intervention. Some specific issues of base isolation for seismic retrofitting of multiple building structures were lightened. Finally, the seismic assessment of the base-isolated building was carried out. The seismic response was evaluated through nonlinear time-history analysis, using the well-known Bouc-Wen model as the constitutive law of the isolation bearings. For reliable dynamic analyses, a suite of natural accelerograms compatible with acceleration spectra of Italian Code was first selected and then applied along both horizontal directions. The results were finally used to address some of the critical issues of the seismic response of the base-isolated multiple building structure: accidental torsional effects and potential poundings during strong earthquakes.

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“…Annex B of EN 1998-3 [6] and in Italian Code [7]. This procedure is equivalent to the capacity spectrum method based on inelastic demand spectra [26,27]. The details of the seismic performance evaluation and design process are extensively described in Ferraioli et al [28,29].…”

Section: Case Study: Hospital Building In Avellino (Italy)mentioning

confidence: 99%

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Evaluation of Equivalent Linearization Method

Ferraioli

Mandara

2016

Mathematical Problems in Engineering

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Although the most commonly used isolation systems exhibit nonlinear inelastic behaviour, the equivalent linear elastic analysis is commonly used in the design and assessment of seismic-isolated structures. The paper investigates if the linear elastic model is suitable for the analysis of a seismically isolated multiple building structure. To this aim, its computed responses were compared with those calculated by nonlinear dynamic analysis. A common base isolation plane connects the isolation bearings supporting the adjacent structures. In this situation, the conventional equivalent linear elastic analysis may have some problems of accuracy because this method is calibrated on single base-isolated structures. Moreover, the torsional characteristics of the combined system are significantly different from those of separate isolated buildings. A number of numerical simulations and parametric studies under earthquake excitations were performed. The accuracy of the dynamic response obtained by the equivalent linear elastic model was calculated by the magnitude of the error with respect to the corresponding response considering the nonlinear behaviour of the isolation system. The maximum displacements at the isolation level, the maximum interstorey drifts, and the peak absolute acceleration were selected as the most important response measures. The influence of mass eccentricity, torsion, and high-modes effects was finally investigated.

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Accuracy of Advanced Methods for Nonlinear Static Analysis of Steel Moment-Resisting Frames

Cited by 14 publications

References 26 publications

06.03: Dynamic increase factor for nonlinear static alternate path analysis of steel moment‐resisting frames against progressive collapse

06.03: Dynamic increase factor for nonlinear static alternate path analysis of steel moment‐resisting frames against progressive collapse

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Design, Construction, and Assessment

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Evaluation of Equivalent Linearization Method

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