Assessment of the dynamic response of unreinforced masonry structures using a macroelement modeling approach

Chácara, César; Cannizzaro, Francesco; Pantò, Bartolomeo; Caliò, Ivo; Lourénço, Paulo B.

doi:10.1002/eqe.3091

Cited by 45 publications

(19 citation statements)

References 29 publications

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“…Nonetheless, the computational burden of the DMEM revealed to be high 39 and of particular concern in view of complex static and dynamic analyses. 44,45 In this paper, a new macro-model is proposed which aims to overcome the limits of both the diagonal strut model and the DMEM and ensure a satisfying accuracy in the simulation of the in-plane seismic response of IRCFS. The proposed model is composed of a shear deformable macro-element consisting of an articulated quadrilateral with a single diagonal non-linear link, connected to the adjacent elements by means of a set of concentrated 2D non-linear links-two contact links for each edge of the quadrilateral-simulating the coupled interaction between normal and tangential stresses.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

“…This strategy allowed the static condensation of the degrees of freedom associated with the interface links and thus the reduction of the degrees of freedom of the system. Nonetheless, the computational burden of the DMEM revealed to be high and of particular concern in view of complex static and dynamic analyses …”

Section: Introductionmentioning

confidence: 99%

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 DMEM has been employed to simulate the seismic behavior of monumental masonry constructions by means of non-linear static (push-over) analyses [20] [21]. Recently, the model has been extended to the dynamic field [12].…”

Section: The Adopted Discrete Macro-element Methodsmentioning

confidence: 99%

“…The capability of the proposed DMEM to account for the in and out-of-plane behavior of masonry structure has been already numerically and experimentally investigated [12] [13]. In this paper the DMEM method is applied for evaluating the nonlinear dynamic response of a typical church façade subjected to earthquake loadings.…”

Section: Introductionmentioning

confidence: 99%

Out-of-Plane Seismic Response of Masonry Façades Using Discrete Macro-Element and Rigid Block Models

Giresini¹,

Pantò²,

Caddemi³

et al. 2019

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

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This paper investigates the out-of-plane response of masonry façades under earthquakes by means of two different approaches. A discrete macro-element approach, based on modelling the structure by means of spatial deformable macro-elements interacting through nonlinear zero-thickness interfaces, and the classical approach in which the masonry façade is assumed as a rigid block subjected to earthquake loading. The latter method neglects the elasticity of the masonry element and contemplates the energy dissipation only at each impact by means of a coefficient of restitution. The results of dynamic non-linear analyses, performed with the two methods on a real case of a church façade, provide a first comparison between the two approaches highlighting some limits of application of the simplified rigid block model.

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“…In these cases the interfaces, simulating the joints, are generally characterized by a unilateral (no-tension) normal-bond behaviour and a frictional-Coulomb, associated or non-associated, tangential-bond behaviour [1]- [4]. In addition, the seismic response of HMS is governed by a mutual interaction between the in-plane and out-of-plane behaviour [5]- [7] [6]. Therefore, it is necessary to evaluate 3D capacity domains to characterise the contact joints in order to manage the torsion-shear-bending moment interaction.…”

Section: Introductionmentioning

confidence: 99%

A New 3d-Adaptive Discrete Interface for Modeling the Torsion Behavior of Masonry Contact Joints

Casapulla¹,

Pantò²,

Caliò³

2019

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

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The numerical modelling of the torsion behaviour of masonry block joints represents a key aspect for the assessment of the out-of-plane response of masonry walls. However, it represents a challenging computational issue due to the high non-linear coupling between the torsion and other internal forces (shear, bending moment and axial load), meaning the necessity to use complex 3D non-linear constitutive laws. The limit analysis-based approaches represent efficient and reliable numerical tools to predict the ultimate torsion load including the interaction with shear and bending moment. Within this framework, few researchers have proposed and experimentally validated continuous and discrete contact models, able to predict the ultimate strength of masonry contact joints. These models are successfully employed to develop highdetailed simulations of 3D dry-jointed masonry block structures subjected to lateral in-plane and out-of-plane actions. Nonetheless, the limit analysis is not able to characterize the nonlinear response of masonry walls prior to collapse and to predict the evolution of plastic damage and the ductility resources, if available. Aiming at overcoming such a limit, this paper introduces a new 3D adaptive discrete interface, able to simulate the non-linear torsion-shear behaviour of masonry joints. The interface consists of four springs whose orientation is updated during the analysis, following an incremental iterative Newton-Raphson algorithm taking into account the current position of the torsion centre of the interface. The ultimate torsion-shear capacity domain obtained by the proposed model is compared with limit-analysis predictions and experimental data available in the literature. The results highlight the ability of the new interface to effectively reproduce the non-linear behaviour and the ultimate strength of joints subjected to different loading combinations.

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Assessment of the dynamic response of unreinforced masonry structures using a macroelement modeling approach

Cited by 45 publications

References 29 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

Out-of-Plane Seismic Response of Masonry Façades Using Discrete Macro-Element and Rigid Block Models

A New 3d-Adaptive Discrete Interface for Modeling the Torsion Behavior of Masonry Contact Joints

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