Seismic safety evaluation of reinforced concrete masonry infilled frames using macro modelling approach

Pantò, Bartolomeo; Caliò, Ivo; Lourénço, Paulo B.

doi:10.1007/s10518-017-0120-z

Cited by 46 publications

(40 citation statements)

References 30 publications

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“…As an example, the basic discretisation of the full infill wall shown in Figure A consists of a single macro‐element (Figure 2B), whereas that of the open infill wall in Figure A consists of five macro‐elements (Figure 3B). Starting from these basic discretisations, a mesh refinement (Figures 2C and C) can be considered to achieve a more accurate simulation of the damage development within the infill and a more refined description of the interaction between infill and frame . In any case, the values of the mechanical parameters of the macro‐element do not vary because of the presence of openings, but only depend on the geometry of the panels composing the mesh and the mechanical properties of the masonry by means of the calibration procedures described in the following section.…”

Section: The Proposed Modelmentioning

confidence: 99%

“…As proved by some research studies, eg, Pantò et al, masonry infills may even represent the main earthquake resistant part of buildings designed to resist gravity loads only. In any case, depending on the mechanical properties of infills and RC framed structure and on the regularity of both in plan and in elevation distributions of masonry panels, the presence of infills may be advantageous or disadvantageous for the seismic performance of buildings …”

Section: Introductionmentioning

confidence: 99%

“…Specifically, the shear response of a masonry (macro‐) portion was simulated by means of a regular articulated quadrilateral, while the axial/rocking masonry response and the sliding motions were simulated by non‐linear zero‐thickness interfaces. Owing to the adopted approach, openings posed no problem because an appropriate mesh of macro‐elements is able to replicate the actual geometry of infills with any regular or irregular distribution of openings . The DMEM was implemented in a dedicated structural software and successfully validated by comparison with results of experimental tests and refined FEM models .…”

Section: Introductionmentioning

confidence: 99%

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A new macromodel for the assessment of the seismic response of infilled RC frames

Pantò

Rossi

2019

Earthq Engng Struct Dyn

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Summary Numerous research studies have proved that numerical models aiming at an accurate evaluation of the seismic response of RC framed buildings cannot ignore the inelastic behaviour of infills and the interaction between infill and frame elements. To limit the high computational burden of refined non‐linear finite element models, in the latest decades, many researchers have developed simplified infill models by means of single or multiple strut‐elements. These models are low time‐consuming and thus adequate for static and dynamic analyses of multi‐storey structures. However, their simulation of the seismic response is sometimes unsatisfying, particularly in the presence of infill walls with regular or (particularly) irregular distributions of openings. This paper presents a new 2D plane macro‐element, which provides a refined simulation of the non‐linear cyclic response of infilled framed structures at the expense of a limited computational cost. The macro‐element consists of an articulated quadrilateral panel, a single 1D diagonal link, and eight 2D links and is able to model the shear and flexural behaviour of the infill and the non‐linear flexural/sliding interaction between infill and surrounding frame. The proposed macro‐element has been implemented into the open source software OpenSees and used to simulate the response of single‐storey, single‐span RC infilled frame prototypes tested by other authors. The above prototypes are selected as made of different masonry units and characterised by full or open geometric configuration.

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Section: The Proposed Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new macromodel for the assessment of the seismic response of infilled RC frames

Pantò

Rossi

2019

Earthq Engng Struct Dyn

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“…The proposed macro-node element has been inspired by a plane macro-element proposed by the authors for the simulation of nonlinear behaviour of unreinforced masonry buildings [6,7,8,9] and masonry infilled frames [10,11]. The basic element can be described by referring to a simple mechanical representation in which the element is regarded as an articulated quadrilateral endowed with along-side interfaces that, consistently to a fibre discretization, account for both the concrete and steel bars contributions.…”

Section: The Proposed Macro-modelmentioning

confidence: 99%

A New Discrete Macro-Node Element for the Seismic Behaviour Modelling of Reinforced Concrete Frames

Pantò¹,

Caddemi²,

Caliò³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. Recent earthquakes have demonstrated that the seismic behaviour of existing reinforced concrete buildings, not designed to resist to earthquake loadings, is strongly affected by the local collapses of the beam-to-column joints that can be subjected to shear collapse of the central region or bond-slip of the longitudinal steel bars. In this paper a new macro-node element able to account for the nonlinear behaviour of the beam-to-column joints is presented. The model can be represented by a simple mechanical scheme constituted by an articulated quadrilateral whose rigid edges connect beams and columns through nonlinear discrete interfaces and whose internal deformability is related to a single degree of freedom only. The model is able to account for the shear failure of the joint region as well as the flexural andshear plastic deformations at the contact edges of the connected elements allowing the nonlinear modeling of a frame structure through an assemblage of non-linear macro-nodes connected by means of elastic frame elements.

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“…In particular, the detailed local numerical model allowed justifying the partial collapse of the frescoed vault. Finally, a vulnerability assessment of the building in terms of peak ground acceleration (PGA) was performed according to the Eurocode 8 [29,30], as already done with reference to reinforced concrete masonry infilled frames [31]. The procedure was compared with an alternative vulnerability assessment based on nonlinear dynamic analyses conducted on equivalent single degree of freedom systems.…”

Section: Introductionmentioning

confidence: 99%

Multi-Directional Seismic Assessment of Historical Masonry Buildings by Means of Macro-Element Modelling: Application to a Building Damaged during the L’Aquila Earthquake (Italy)

et al. 2017

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Abstract:The experience of the recent earthquakes in Italy caused a shocking impact in terms of loss of human life and damage in buildings. In particular, when it comes to ancient constructions, their cultural and historical value overlaps with the economic and social one. Among the historical structures, churches have been the object of several studies which identified the main characteristics of the seismic response and the most probable collapse mechanisms. More rarely, academic studies have been devoted to ancient palaces, since they often exhibit irregular and complicated arrangement of the resisting elements, which makes their response very difficult to predict. In this paper, a palace located in L'Aquila, severely damaged by the seismic event of 2009 is the object of an accurate study. A historical reconstruction of the past strengthening interventions as well as a detailed geometric relief is performed to implement detailed numerical models of the structure. Both global and local models are considered and static nonlinear analyses are performed considering the influence of the input direction on the seismic vulnerability of the building. The damage pattern predicted by the numerical models is compared with that observed after the earthquake. The seismic vulnerability assessments are performed in terms of ultimate peak ground acceleration (PGA) using capacity curves and the Italian code spectrum. The results are compared in terms of ultimate ductility demand evaluated performing nonlinear dynamic analyses considering the actual registered seismic input of L'Aquila earthquake.

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Seismic safety evaluation of reinforced concrete masonry infilled frames using macro modelling approach

Cited by 46 publications

References 30 publications

A new macromodel for the assessment of the seismic response of infilled RC frames

A new macromodel for the assessment of the seismic response of infilled RC frames

A New Discrete Macro-Node Element for the Seismic Behaviour Modelling of Reinforced Concrete Frames

Multi-Directional Seismic Assessment of Historical Masonry Buildings by Means of Macro-Element Modelling: Application to a Building Damaged during the L’Aquila Earthquake (Italy)

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