Fragility functions and floor spectra of RC masonry infilled frames: influence of mechanical properties of masonry infills

Blasi, Gianni; Perrone, Daniele; Aiello, Maria Antonietta

doi:10.1007/s10518-018-0435-4

Cited by 30 publications

(19 citation statements)

References 40 publications

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“…The correlation between failure modes of the frame and infill walls' properties was evidenced in past studies (Blasi et al 2018b(Blasi et al , 2020Mehrabi et al 1996;Pujol and Fick 2010), particularly in the case of existing buildings realized before the introduction of capacity design provisions in modern codes (pre-code buildings in the following) (e.g. Dolšek and Fajfar 2005;De Luca et al 2014;Perrone et al 2017).…”

Section: Introductionmentioning

confidence: 90%

MID 1.1: Database for Characterization of the Lateral Behavior of Infilled Frames

et al. 2021

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The research on infilled reinforced concrete frames is fundamental for the vulnerability assessment of existing buildings.The analysis of the interaction between infill and frame is an open issue in performance-based earthquake engineering, due to its importance in predicting the dynamic behaviour and failure modes of buildings. This study provides an open access database of laboratory tests on masonry infilled reinforced concrete frames, collected from the literature and harmonized in a consistent framework.The data were grouped in categories, to calibrate a piecewise linear curve representing the lateral response of the infill, depending on the masonry wall and the frame details. The gathered data are used to assess analytical models and numerical studies from the literature, with the aim to revise the formulations currently used in the equivalent strut approach. An empirical model for the equivalent strut was developed, through a power-law multiple regression of the database. The open access database in its spreadsheet form is aimed at providing a useful tool for the analysis of infilled reinforced concrete frames.

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Section: Introductionmentioning

confidence: 90%

MID 1.1: Database for Characterization of the Lateral Behavior of Infilled Frames

et al. 2021

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“…If for numerical models that account for the seismic behaviour of infill panels, the scientific literature provides some studies [28][29][30], it does not present cases in which the floor system is considered. In particular, based on the results obtained in [5,23], the presence of infill panels provides an increment of the stiffness of vertical elements, which can induce a greater deformability of floor system, especially when infill are defined as 'strong' (with mechanical features with high stiffness -strength values).…”

Section: Seismic Fragility Of Existing Rc Buildingsmentioning

confidence: 99%

Influence of Infill Panels and Floor System in the Fragility Analysis of Existing Rc Buildings: A Case Study

Ruggieri¹,

Porco²,

Fiore³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In the last few years, the study of the seismic fragility of existing Reinforced Concrete (RC) buildings has been the object of a wide interest within the scientific community, especially after the experiences provided by recent hazardous events, which have shown the vulnerability of the existing RC building stock. The recent studies about this topic have shown that the probabilistic approach of Performance Based Earthquake Engineering (PBEE) is the most suitable methodology for taking into account the different sources of uncertainty in fragility analysis, considering both the nature of the seismic demand and the problems related to the incomplete knowledge. For an accurate probabilistic seismic fragility estimation, a fundamental aspect is to consider the contribution of all the elements that constitute the building system, such as the secondary structural (floor system) and non-structural elements (infill panels). In this paper, the focus is aimed on the investigation of the role of secondary and non-structural elements in the evaluation of fragility curves of existing RC buildings. In particular, a real case study, representative of the typical existing school buildings of the Southern Italy, is analysed and discussed.

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“…One of the earlier attempts to correlate inelasticity in terms of structural ductility demand with the ground acceleration can be found in the work of Elenas (1997). Since then, several research studies have been conducted on this subject and attempts have been made to correlate the PFA response of various structural systems with their nonlinear behavior without directly linking PFA with structural displacements (Blasi et al, 2018; Chaudhuri and Hutchinson, 2011; Flores et al, 2015; Lucchini et al, 2014, 2016; Medina et al, 2006; Petrone et al, 2015; Surana et al, 2018; Weiser et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The parametric studies conducted by Petrone et al (2015) on reinforced concrete (RC) frames indicated that EC8 (2004) overestimates NSCs’ acceleration demands for NSCs with periods similar to that of the supporting structure, while it underestimates them for NSCs with higher periods. Lucchini et al (2014) and Blasi et al (2018) noted the significant influence of infill modeling and its mechanical properties on the floor acceleration response. Recently, Surana et al (2018) examined the response of three-dimensional (3D) RC buildings under ground motion excitation and associated the period and the inelasticity of the frames with the PFA based on strength reduction factor.…”

Section: Introductionmentioning

confidence: 99%

Deformation-dependent peak floor acceleration for the performance-based design of nonstructural elements attached to R/C structures

et al. 2021

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This study introduces a simple and efficient method to determine the peak floor acceleration (PFA) at different performance levels for three types of plane reinforced concrete (RC) structures: moment-resisting frames (MRFs), infilled–moment-resisting frames (I-MRFs), and wall-frame dual systems (WFDSs). By associating the structural maximum PFA response with the deformation response, the acceleration-sensitive nonstructural components, and the building contents, can be designed to adhere to the performance-based seismic design of the supporting structure. Thus, the proposed method can accompany displacement-based seismic design methods to design acceleration-sensitive nonstructural elements to comply with the deformation target of the supporting structure. The PFA response shape is represented by line segments defined by key points corresponding to certain floor levels. These key points are defined by explicit empirical expressions developed herein. The maximum PFA response is correlated with the maximum interstory drift ratio (IDR) and other vital characteristics of the supporting structure such as the fundamental period. The proposed expressions are established based on extensive nonlinear dynamic analyses of 19 MRFs, 19 WFDSs, and 19 I-MRFs under 100 far-fault ground motions scaled to capture different deformation targets. Realistic examples demonstrate the efficiency of the proposed method to assess the PFA response at a given IDR, making the method suitable in the framework of performance-based design.

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Fragility functions and floor spectra of RC masonry infilled frames: influence of mechanical properties of masonry infills

Cited by 30 publications

References 40 publications

MID 1.1: Database for Characterization of the Lateral Behavior of Infilled Frames

MID 1.1: Database for Characterization of the Lateral Behavior of Infilled Frames

Influence of Infill Panels and Floor System in the Fragility Analysis of Existing Rc Buildings: A Case Study

Deformation-dependent peak floor acceleration for the performance-based design of nonstructural elements attached to R/C structures

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