Generalized corrective eccentricities for nonlinear static analysis of buildings with framed or braced structure

Bosco, Melina; Ghersi, Aurelio; Marino, Edoardo M.; Rossi, Pier Paolo

doi:10.1007/s10518-017-0159-x

Cited by 17 publications

(40 citation statements)

References 42 publications

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“…From the extensive parametric investigation [1] as well as by the recently international literature review [2,3,4], the main conclusions and the proposed methodology are summarized below:…”

Section: Methodsmentioning

confidence: 99%

“…Also, in Fig. 6, by the recently international literature using a fully different methodology, the pushover analysis according to the "corrective eccentricity method" by Bosco et al (2017) [4] is illustrated, where the corrective eccentricities and for the building stiff sides (for loading along the horizontal axes and respectively) have been calculated, plus the accidental eccentricities. Thus, our investigative results are very compatible with Bosco"s ones; however, the investigative results disappoint Eurocode EN 1998-1.…”

Section: Proposed Methods Of Pushover Analysismentioning

confidence: 99%

“…For documented application of pushover analysis on asymmetric single-storey buildings, the lateral static floor load should be applied with eccentricity relative to the Mass Centre of the diaphragm and should also be properly oriented along each horizontal principal axis of the building [1]. This is the only way to consider the phenomenon of the development of diaphragm torsional vibration about vertical axis coupled to translational ones, due to the developing inertial torsional (about Z-axis) moment of the building floor, a phenomenon occurring both in linear and in non-linear areas [1,2,3,4]. Eurocode EN 1998-1 [5] suggests that the position of the Mass Centre (where the external lateral static floor force is applying) must be moved by the floor accidental eccentricity, but in this way, there is still the inability to obtain the inertial torsional moment of the diaphragm.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Bakalis

Makarios

2020

Seismic Behaviour and Design of Irregular and Complex Civil Structures III

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Α new version about a method of documented application of pushover analysis on asymmetric single-storey buildings has been presented, recently. The main target of this new method was to rationally consider the coupling between torsional (about vertical axis) and translational vibrations of asymmetric singlestorey building diaphragm under translational seismic excitation of its base. For this reason, the equivalent lateral static floor force according to the new method is applied using suitable dynamic eccentricities, eccentric to building Mass Centre, which are added with the accidental eccentricities, in such a way that the final design eccentricities move the application point of floor, external, lateral, static force away from the diaphragm Mass Centre. The origin point for measuring the dynamic eccentricities is called "Capable Near Collapse Centre of Stiffness ". Also, the floor lateral static force must be oriented along the building principal axes which are called "Capable Near Collapse Principal Axes" and , respectively. The appropriate dynamic eccentricities for the stiff-side and the flexible-one of the floor plan derive from extensive parametric analysis and are calculated by graphs and suitable equations. In the present work, a numerical example of an asymmetric single-storey building is presented to illustrate clearly and in detail the step by step application of the proposed pushover analysis method. It is a torsional sensitive reinforced concrete building designed in accordance with Eurocodes EN 1992-1 and 1998-1 for ductility class high (DCH). The proposed method is evaluated relative to the results of non-linear response history analysis (ΤΗ). The final results show that the proposed method of pushover analysis predicts with safety the displacement of the stiff side of the building as well as that of the flexible side.

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“…From the extensive parametric investigation [1] as well as by the recently international literature review [2,3,4], the main conclusions and the proposed methodology are summarized below:…”

Section: Methodsmentioning

confidence: 99%

Section: Proposed Methods Of Pushover Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Bakalis

Makarios

2020

Seismic Behaviour and Design of Irregular and Complex Civil Structures III

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“…Spatial variations of mass eccentricities may significantly increase the dynamic structural response of buildings as compared to the results obtained from a static structural analysis [2]. Recent research studies on inelastic systems, based on the provisions of current design codes, demonstrated that the benefits of the inelastic analyses may be small, compared to designs where the accidental eccentricity was not taken into account [3][4][5][6][7]. It was therefore suggested that accidental design eccentricities may not be taken into account or perhaps replaced by simpler design guidelines.…”

Section: Introductionmentioning

confidence: 99%

Mass eccentricity effects on the torsional response of inelastic buildings

Georgoussis¹,

Mamou²

2019

Vib. proced.

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This paper investigates the role of accidental mass eccentricities on the inelastic torsional behaviour of multi-storey asymmetric buildings with a mixed type lateral load resisting system subjected to the Erzincan-1992 and Kobe-1995 ground motions. The numerical modelling results show that the effects of spatial variations of mass eccentricities are lower and smoother in the inelastic rather than the elastic state of deformation, but both the elastic and inelastic torsional response is pointing to the same optimum location of the key element for which the torsional response of the structure is minimized.

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“…Jiang and Kuang [17] investigated the influence of uncoupled torsion to lateral frequency ratio and bidirectional eccentricities on the normalized frequencies of multistorey bidirectional stiffness eccentric structures from elastic stage to inelastic stage. Bosco et al [18] proposed new corrective eccentricity aiming at generalizing and simplifying the previous corrective eccentricity method, and these equations of corrective eccentricities are defined based on the response of a set of single-storey systems representative of buildings. This research lays the foundation for the application of nonlinear static method in seismic assessment of eccentric structures.…”

Section: Introductionmentioning

confidence: 99%

Inelastic Parametric Analysis of Seismic Responses of Multistorey Bidirectional Eccentric Structure

Kuang

Xin-liang

Jiang

2018

Shock and Vibration

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This paper conducts a parametric study on the seismic response of multistorey bidirectional eccentric structures from elastic stage to inelastic stage. Based on a simplified multistorey bidirectional eccentric model composed of bidirectional lateral load-resisting members, a general law is proposed for three-stage natural frequency variation behaviour from elastic stage to inelastic stage of eccentric frame structures with different layers. Different simplification treatments are conducted on each stage and the three stable parameter analysis stages are defined. The corresponding dynamic stiffness matrices and motion equations in different loading stages are derived. On this basis, a parametric analysis of seismic response of a three-storey bidirectional regular eccentric structure from elastic stage to inelastic stage is conducted. Effects of the uncoupled torsion to lateral frequency ratios (Ω) and bidirectional eccentricities on the seismic responses are investigated. The results reveal that as Ω increases, translational displacement in the load direction first decreases and then increases; meanwhile, the displacement perpendicular to load direction and torsion displacement first rise and then decrease sharply. When Ω = 1.1, the coupling effect between the translation in the load direction and the torsion is at its strongest condition. Increasing the eccentricities leads to a decrease in the displacement in the load direction as well as an increase in the displacement perpendicular to load direction and torsion displacement. Variation regularity of inelastic seismic response is remarkably different from that in elastic stage. The lateral-torsional coupling effect of the bidirectional eccentric structure is closely related to both the period ratio and the bidirectional eccentricities.

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Generalized corrective eccentricities for nonlinear static analysis of buildings with framed or braced structure

Cited by 17 publications

References 42 publications

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Mass eccentricity effects on the torsional response of inelastic buildings

Inelastic Parametric Analysis of Seismic Responses of Multistorey Bidirectional Eccentric Structure

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