Predicting displacement demand of multi-storey asymmetric buildings by nonlinear static analysis and corrective eccentricities

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

doi:10.1016/j.engstruct.2015.05.006

Cited by 28 publications

(25 citation statements)

References 45 publications

(60 reference statements)

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“…[28][29][30][31][32][33][34][35][36] The second is to combine non-linear pushover analysis (representing several modal responses) and either the square root of sum of squares (SRSS) or the complete quadratic combination (CQC), as proposed by Chopra and Goel. [37][38][39][40][41][42][43] The third approach is to combine 2 pushover analyses and envelope the results, as proposed by Bosco et al 44,45 The fourth approach is to combine the analyses of 2 independent equivalent SDOF models (representing the first and second modes) and the envelope of 4 pushover analyses (including the effect of bidirectional excitation). [50][51][52][53][54][55] The first approach, known as the extended N2 method, is the extended version of the simplified procedure proposed by Fajfar and Fischinger.…”

Section: Review Of Previous Work and Problems To Be Investigatedmentioning

confidence: 99%

“…Bosco et al investigated the applicability of this procedure to multistory building models with the same geometry on each floor. 45 In this procedure, "corrective eccentricity" is the key parameter in the pushover analyses. This may be a promising approach because the various possible collapse mechanisms resulting from the combination of several modal responses can be properly predicted using a combination of different force distributions.…”

Section: Review Of Previous Work and Problems To Be Investigatedmentioning

confidence: 99%

“…In recent decades, the author and other researchers worked to extend these simplified procedures to improve the seismic‐performance estimates of buildings with plan or elevation irregularities or both . Recent investigations of the extension of this simplified procedure to an irregular structure were conducted by Lavan and De Stefano and Zembaty and De Stefano .…”

Section: Introductionmentioning

confidence: 99%

“…As proposed by Bosco et al, the third approach estimates the peak response of the frames on the stiff side and that of the frames on the flexible side by enveloping the results of 2 pushover analyses. Bosco et al investigated the applicability of this procedure to multistory building models with the same geometry on each floor . In this procedure, “corrective eccentricity” is the key parameter in the pushover analyses.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Fujii

2018

Japan Architectural Review

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The applicability of a simplified procedure, namely mode‐adaptive bidirectional pushover analysis (MABPA), to the prediction of the non‐linear peak response of a multistory asymmetric building subjected to bidirectional excitation is discussed. The first part of the paper summarizes the formulation of 2 independent equivalent single‐degree‐of‐freedom models representing the first and second modal responses. The relationship between the critical assumptions of MABPA and the torsional index defined based on mode shape is then discussed. In the latter part of the paper, non‐linear time‐history analyses of 4‐story torsionally stiff (TS) or torsionally flexible asymmetric buildings are described, and the results are compared with the predictions. The results show that MABPA predicts the peak response displacement of only the TS asymmetric buildings satisfactorily. Therefore, MABPA should be considered applicable only to TS buildings. The applicability of MABPA to a given asymmetric building may be evaluated by using the torsional indices of the first 3 modes.

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Section: Review Of Previous Work and Problems To Be Investigatedmentioning

confidence: 99%

Section: Review Of Previous Work and Problems To Be Investigatedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Fujii

2018

Japan Architectural Review

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“…The recent studies also emphasize that current NSPs, to conduct a simple and accurate analysis, play an important role to determine inelastic seismic demands of structures. Researches conducted by Bosco et al [3], to Predict displacement demand of multi-story asymmetric buildings, by Mazza [4] to analyze reinforced concrete framed buildings, by Wan et al [5] that propose a new NSP to analyze precast concrete diaphragms and by Foraboschi et al [6] in analysis of masonry buildings by NSPs are as examples of these recent researches. Some improvements are applied to current NSPs in FEMA-440 [7], but all of equations and relations of these methods are developed for fixed-base structures.…”

Section: Introductionmentioning

confidence: 99%

Investigation the accuracy of FEMA-440 procedure to analyze soil-structure systems

Khanmohammadi¹,

Amiri²,

Davoodi³

2017

J. vibroeng.

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A common analysis method of soil-structure systems in seismic design procedures such as FEMA-440 is to replace the entire soil-structure system by a fixed-base oscillator with an equivalent fundamental period and damping ratio to consider inertial effect of soil-structure interaction. It is generally believed by researchers that ignoring kinematic effect of soil-structure interaction is conservative to determine response of structures and FEMA-440 supports this idea by defining a reduction factor applying to elastic response spectra. Also, the improvements of nonlinear static procedures in FEMA-440 are achieved for fixed-base structures and the soil effects are not perfectly obtained in coefficients and relations of these procedures. Thus, it seems necessary to assess the accuracy of proposed procedures of FEMA-440 to include soil-structure interaction. In this paper, the accuracy of equivalent replacement oscillator and nonlinear static Procedures of Equivalent Linearization and Coefficient methods, defined in FEMA-440, to analyze soil-structure systems with surface and embedded foundations are evaluated. Both kinematic and inertial effects of soil-structure interaction are investigated by conducting a parametric study using 20 ground motions recorded on soft soil site E, on which the more SSI effects are probable. 4339 difference between the motion experienced by the essentially rigid foundation (the foundation input motion (FIM)) and the free-field motion (FFM). This effect is called the kinematic interaction (KI) effect and happens even if the foundation has no mass. In other words, the FIM is the result of geometric averaging of the seismic input motion in the free field (Meek and Wolf [8]).2) The flexibility of soil affects the response of the structure subjected to FIM. In fact, the soil-structure system behaves as a new system with different dynamic properties (longer natural period and usually higher damping). This effect is called inertial interaction (II) effect.Numerous researches on the effects of SSI have been carried out over the past few decades, but generally excluded the nonlinear behavior of structures. Replacing the entire soil-structure system with a fixed-base oscillator to consider II effect is a common analysis method in seismic design procedures. Current SSI-related regulations in seismic codes, such as ATC3-06 [9] and NEHRP [10] are based only on the knowledge of the II effect on elastic response of structures while the KI effect is traditionally ignored. The variations of the equivalent natural period and damping ratio of equivalent replacement oscillator have been studied by other researchers such as Veletsos and Meek [11], Veletsos and Nair [12], Wolf [13] and Aviles and Perez-Rocha [14].However, the yielding behavior of structures has recently been given more attention by some researchers. Bielak [15] first studied this matter by investigating the harmonic response of a bilinear structure supported on a visco-elastic half-space and found that the resonant structural deformation could...

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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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Predicting displacement demand of multi-storey asymmetric buildings by nonlinear static analysis and corrective eccentricities

Cited by 28 publications

References 45 publications

Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Prediction of the peak seismic response of asymmetric buildings under bidirectional horizontal ground motion using equivalentSDOFmodel

Investigation the accuracy of FEMA-440 procedure to analyze soil-structure systems

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

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