Simulation of boundary conditions for testing of masonry shear walls

Salmanpour, Amir Hosein; Mojsilović, Nebojša

doi:10.1063/1.4938935

Cited by 8 publications

(9 citation statements)

References 2 publications

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“…Moreover, it is shown that CMS provides a straightforward framework for computing reduced-order matrices from substructures characterized by nonlumped stiffness and mass compatibly with the limited number of physical DoFs. The HS campaign conducted on a load-bearing unreinforced masonry structure subjected to seismic loading and implemented using a standard three-actuator setup (eg, Salmanpour and Mojsilović 16 ) demonstrates the effectiveness of the proposed approach. Results of experiments, which were performed with different orders of reduction of the NS, highlight the potential of CMS for enabling multi-DoFs experiments.…”

Section: Scopementioning

confidence: 97%

A model‐order reduction framework for hybrid simulation based on component‐mode synthesis

Miraglia

Petrović

Abbiati

et al. 2020

Earthq Engng Struct Dyn

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Testing of stiff physical substructures (PSs) still poses major technical issues that prevent from adopting hybrid simulation (HS) as a standard structural testing method. Firstly, elastic deformation of reaction frames, as well as the limited resolution of displacement transducers, deteriorate displacement control accuracy. Secondly, as a consequence of control errors, small perturbations of actuator displacements entail large restoring force oscillations that spuriously excite the higher eigenmodes of the hybrid model. For this reason, in the current practice, force-controlled hydraulic jacks handle vertical degrees of freedom, which are typically associated with stiff axially loaded members and excluded from the time integration loop. Vertical forces are either kept constant or adjusted during the experiment based on simplified redistribution rules. Besides deterioration of displacement control accuracy, stiff PSs naturally increase the frequency bandwidth of the hybrid model, whose higher eigenfrequencies (divided by the testing time scale) may fall outside the frequency bandwidth of the actuation system, thus destabilizing the HS. This is a collateral issue to which, in the authors' knowledge, no sufficient attention as been dedicated yet, and this paper tries to address it. From this standpoint, we propose component-mode synthesis as a rigorous approach for deriving reduced-order physical and numerical substructure mass and stiffness matrices that minimize the frequency bandwidth of the hybrid model. The proposed methodology allowed for performing HSs of a load-bearing unreinforced masonry structure including both horizontal and vertical degrees of freedom with a standard three-actuator setup used for cyclic testing.

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Section: Scopementioning

confidence: 97%

A model‐order reduction framework for hybrid simulation based on component‐mode synthesis

Miraglia

Petrović

Abbiati

et al. 2020

Earthq Engng Struct Dyn

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“…Figure 3. DIC reported areas and camera resolution of masonry and slab tests [4,6,8,9,[11][12][13]15,47].…”

Section: Laboratory Structural Tests and Applications Using Dicmentioning

confidence: 99%

“…It is evident from Figure 3 that as camera resolution improves, there is an observable increase in the size of the areas investigated during the DIC structural testing of masonry walls and slabs. It is worth noting that these tests utilizing DIC were not feasible until recently [3][4][5][6][7][8][9][10][11][12][13][14][15]. The enhancement of camera resolution has significantly broadened the applicability of digital image correlation (DIC), not only facilitating its use for larger specimens but also extending its utility regarding small and micro-scale specimens.…”

Section: Introductionmentioning

confidence: 99%

A Digital Image Correlation Technique for Laboratory Structural Tests and Applications: A Systematic Literature Review

Mousa,

Yussof,

Hussein

et al. 2023

Sensors

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Digital image correlation (DIC) is an optical technique used to measure surface displacements and strains in materials and structures. This technique has demonstrated significant utility in structural examination and monitoring. This manuscript offers a comprehensive review of the contemporary research and applications that have leveraged the DIC technique in laboratory-based structural tests. The reviewed works encompass a broad spectrum of structural components, such as concrete beams, columns, pillars, masonry walls, infills, composite materials, structural joints, steel beams, slabs, and other structural elements. These investigations have underscored the efficacy of DIC as a metrological instrument for the precise quantification of surface deformation and strain in these structural components. Moreover, the constraints of the DIC technique have been highlighted, especially in scenarios involving extensive or complex test configurations. Notwithstanding these constraints, the effectiveness of the DIC methodology has been validated as a strain measurement instrument, offering numerous benefits such as non-invasive operation, full-field measurement capability, high precision, real-time surveillance, and compatibility with integration into other measurement instruments and methodologies.

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“…In order to prevent any out-of-plane movement of the loading beam, an auxiliary, low friction sliding system (not shown on Fig. 2 [19,20]. Each test was stopped either due to critical damage conditions or when the response of the specimen was stable (pure sliding) and no difference in response quantities between several consecutive loading history steps was observed.…”

Section: Test Set-up Testing Procedures and Measurementsmentioning

confidence: 99%

Masonry walls with a multi-layer bed joint subjected to in-plane cyclic loading: An experimental investigation

Petrović

Mojsilović

Stojadinović

2017

Engineering Structures

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A series of static-cyclic shear tests on full-scale unreinforced masonry (URM) walls with multi-layer bed joints have been performed within a research project on the seismic behaviour of unreinforced masonry walls with soft layer membrane placed in the bed joint to induce sliding. Walls were made using typical perforated Swiss clay blocks and standard cement mortar and the so-called multi-layer bottom bed joints, which comprise a core soft layer protected by two layers of extruded elastomer and placed in the middle of mortar joint. The preliminary testing phase was aimed at choosing the most suitable core soft layer type among the four types considered (rubber granulate, cork, cork-rubber granulate and bitumen). The main testing phase comprised five tests on storey-high URM specimens with rubber granulate core soft layers performed to investigate the influence of the size, the pre-compression level and the aspect ratio on the seismic behaviour of URM walls with a multi-layer bed joint. Sliding occurred in all tested specimens. However, the final failure mode as well as the displacement capacity of test specimens were governed by the extent of shear and tensile (vertical) cracks that developed from the bottom brick course. The response of specimens can be interpreted using a multilinear horizontal forcedisplacement response idealization, whose parameters can be estimated using the proposed equations.

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Simulation of boundary conditions for testing of masonry shear walls

Cited by 8 publications

References 2 publications

A model‐order reduction framework for hybrid simulation based on component‐mode synthesis

A model‐order reduction framework for hybrid simulation based on component‐mode synthesis

A Digital Image Correlation Technique for Laboratory Structural Tests and Applications: A Systematic Literature Review

Masonry walls with a multi-layer bed joint subjected to in-plane cyclic loading: An experimental investigation

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