Generalized force vectors for multi‐mode pushover analysis of torsionally coupled systems

Kaatsz, Kaan; Sucuoğlu, Halûk

doi:10.1002/eqe.2434

Cited by 21 publications

(5 citation statements)

References 17 publications

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“…The authors assessed the reliability of the proposal on 3D archetype-RC buildings having different features (regular, irregular in stiffness, irregular in mass) and they compared the results with nonlinear dynamic analyses. A more recent research is [16], in which the authors proposed a generalized pushover analysis (GPA) conceived for taking into account the force distribution in 3D torsionally coupled systems based on the maximum interstorey drift obtained under seismic action. In [17], a unique load profile was proposed, through the modal decomposition of the maximum displacements vector (u max ) obtained by the complete quadratic combination (CQC) of the linear effects after response spectrum analysis.…”

Section: Pushover Analysis: Brief Overview About Conventional and Nonmentioning

confidence: 99%

Accounting for the Spatial Variability of Seismic Motion in the Pushover Analysis of Regular and Irregular RC Buildings in the New Italian Building Code

Ruggieri

Uva

2020

Buildings

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Pushover analysis is the main methodology adopted in practice-oriented applications for investigating the non-linear response of reinforced concrete (RC) buildings; it is applicable for both new and existing buildings. It is well-known that several limitations characterize this methodology and the scientific literature proposes several non-conventional approaches to provide results comparable to those of the more efficient nonlinear dynamic analysis. In most recent seismic guidelines, some improvements have been introduced, in order to overcome the main drawbacks of conventional pushover methods, in view of practice-oriented applications. In particular, new prescriptions are related to the load profiles and the choice of control nodes, aspects that lead to different results in terms of capacity curves and in the safety assessment. Another relevant point is represented by the spatial combination of effects, which suggests the opportunity of executing simultaneous bi-directional pushover analyses. The aim of this paper is to investigate the effects of the new trends followed by some guidelines about pushover analysis, such as the recent 2018 release of the Italian Building Code. In particular, after a general test of the new conventional procedure for the case of RC buildings, a set of case studies has been generated, consisting of three-dimensional RC-archetypes specifically designed and investigated in order to cover the more significant scenarios. The results in terms of global and local performances are processed and critically analyzed, with the aim of appraising the main differences between the traditional and new approaches and identifying the effectiveness and of the actual improvements achieved.

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Section: Pushover Analysis: Brief Overview About Conventional and Nonmentioning

confidence: 99%

Accounting for the Spatial Variability of Seismic Motion in the Pushover Analysis of Regular and Irregular RC Buildings in the New Italian Building Code

Ruggieri

Uva

2020

Buildings

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“…The proposed method was assessed on a three-dimensional (3D) RC building, on which authors varied some features to introduce irregularity. Kaatsız and Sucuoğlu [12] proposed the generalized pushover analysis, elaborated for identifying a load profile to apply on a 3D torsionally coupled system. The method was developed for simulating maximum IDRs under seismic action.…”

Section: Pushover -7x -Irr50mentioning

confidence: 99%

Extending the concepts of response spectrum analysis to nonlinear static analysis: Does it make sense?

Ruggieri,

Uva

2024

Innov. Infrastruct. Solut.

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The study presented in this paper aims to assess the recent novelties proposed by new generation building codes about the extension of some concepts at the base of linear analyses to the procedures of nonlinear static analysis. The nonlinear static analysis (pushover) is an extensively adopted approach by engineers and practitioners for purpose of assessing the seismic performance of new and existing buildings, although several drawbacks characterize this methodology, as evidenced by the existing scientific literature. In order to overcome the well-known limitations characterizing nonlinear static analysis, and to offer an alternative to nonlinear dynamic analysis, the recent upgrades of some building codes, such as the Italian one, provide different rules to employ in nonlinear static procedures. Among these new provisions, one regards the possibility to use a horizontal load profile proportional to the storey forces derived from a response spectrum analysis in all cases (i.e., also for irregular buildings). The main goal of this study is to demonstrate the reliability of this new load profile when strong irregularities arise. To this scope, the seismic behaviour of a sample of archetype buildings characterized by increasing in-height irregularity was investigated. The sample of buildings was subdivided in two subsets characterized by different design levels, one conceived by considering the prescriptions of the new Italian building code and one designed according to the oldest Italian building code (i.e., without considering anti-seismic details). The sample of buildings, simulating new and existing cases, was firstly modelled and after investigated through nonlinear static analyses by employing both traditional (i.e., inverse triangular- and uniform-like) and new (i.e., derived from response spectrum analysis) load profiles. After, nonlinear dynamic analyses were run, in order to assess the capacity of both traditional and new load profiles to capture the dynamic behaviour of the investigated archetype buildings. The performed analysis campaign demonstrated the efficiency of the new load profile proposed by the code, and the output of the work provided an answer to the main question posed by the authors: does it make sense to extend the concepts of response spectrum analysis to nonlinear static analysis?

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“…In this section, various studies that used NSA to assess structural demands obtained from multidirectional seismic loads were presented. Although there are several methods to apply PO load distributions, such as adaptive [77,78] or multi-mode methods [33,79] (among them, the generalised force vectors for multi-mode PO analysis [80,81]), the authors dealing with multidirectional PO analysis use generally triangular, modal or uniform load patterns, with the only exception of [52], which uses an adaptive pushover procedure. The application of these loads along different incident angles demonstrates that (a) the most significant seismic demands may not be aligned with the principal structural directions and (b) there is a substantial variability in seismic demand depending on the direction of load application.…”

Section: Nonlinear Static Analysismentioning

confidence: 99%

Historical Evolution of the Impact of Seismic Incident Angles on the Safety Assessment of Various Building Construction Typologies

Cantagallo,

Terrenzi,

Camata

et al. 2024

Buildings

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In the existing building stock, typically characterised by a high degree of irregularity, the effects of earthquakes are strongly dependent on the epicentre–structure direction and the angle of incidence of the seismic motion. However, the scientific community has not yet reached a unanimous consensus on the evaluation of the effects of seismic incidence angles. Therefore, this paper conducts an extensive investigation of the international literature on current methods to consider seismic directionality, systematically reviewing more than 80 publications on this topic. Following a brief overview of the problem and an analysis of the initial developments of the multidirectionality concept of seismic input, a state-of-the-art review is presented based on the considered analysis methods, specifically response spectrum analysis, nonlinear static analysis, and nonlinear response history analysis. Moreover, the adoption of multidirectional seismic input in popular codes and standards is presented and discussed. This study provides the first comprehensive synthesis of research on the seismic incidence angles across diverse building typologies, offering crucial insights for future code revisions and highlighting significant gaps in current analytical methods and standards, thereby setting a new direction for subsequent empirical investigations. Specifically, the extensive state-of-the-art review revealed that, until now, the evaluation of the angle of incidence was primarily conducted on existing reinforced concrete buildings with a limited number of storeys, analysed with nonlinear response history analysis. This underscores the need for future research to extensively investigate the impact of the angle of incidence on other types of construction typologies.

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Generalized force vectors for multi‐mode pushover analysis of torsionally coupled systems

Cited by 21 publications

References 17 publications

Accounting for the Spatial Variability of Seismic Motion in the Pushover Analysis of Regular and Irregular RC Buildings in the New Italian Building Code

Accounting for the Spatial Variability of Seismic Motion in the Pushover Analysis of Regular and Irregular RC Buildings in the New Italian Building Code

Extending the concepts of response spectrum analysis to nonlinear static analysis: Does it make sense?

Historical Evolution of the Impact of Seismic Incident Angles on the Safety Assessment of Various Building Construction Typologies

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