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Item type:Publication, Shake-table testing of a brick masonry groin vault: Overview of blind predictions and postdictions and comparison with experimental results(Taylor and Francis Ltd., 2024-01-01)This paper presents the results of the blind test competition carried out within the scope of the European project SERA.ta “Seismic Response of Masonry Cross Vaults: Shaking table tests and numerical validations”. The purpose of the competition was to predict the results of a set of tests carried out on an unstrengthened full-scale cross vault with mortar joints and solid bricks (then strengthened with textile reinforced mortar) subjected to a horizontal dynamic excitation. The paper offers an overview of the modelling approaches utilised, along with their corresponding predictions and post dictions. The findings are assessed based on both the damage mechanisms and predicted values for displacements and accelerations in both directions. The results are then compared with the experimental findings. Modelling approaches utilizing the Finite Element Method (FEM) yielded the most accurate predictions regarding displacements and crack patterns. Conversely, a submission employing a Discrete Element model provided the most accurate prediction of damage mechanisms. Nonetheless, the significant discrepancies in predicted displacements and accelerations underscore the necessity for continued efforts to establish consensus on appropriate modelling assumptions for masonry vaults. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental modal-based damage evaluation of masonry cross-vaults under quasi-static and dynamic cyclic loading(Elsevier Ltd, 2026-09-19)Masonry cross-vaults are double-curvature structural systems widely employed in historic churches and monumental buildings, which exhibit a pronounced vulnerability to seismic actions owing to the mechanical characteristics of their constituent materials. In such structures, diagonal cracking induced by in-plane shear deformation represents a typical failure mechanism under seismic loading. Despite this, limited experimental and numerical research has been conducted to assess the seismic response of masonry cross-vaults associated with this failure mechanism. Furthermore, the effect of structural damage on the dynamic properties of masonry cross-vaults remains insufficiently investigated in the existing literature. Accordingly, this study aimed to provide additional insight into the seismic response and modal-based damage evolution of a cross-vault made of alternative materials, namely Compressed Earth Blocks (CEBs), characterised by in-plane shear behaviour. Two specimens were tested under controlled laboratory conditions: one subjected to quasi-static cyclic loading, previously investigated by the authors, and the other subjected to dynamic excitation on a uniaxial shaking table. At predefined loading phases, modal parameters were identified through Operational Modal Analysis using the time-domain stochastic subspace identification (SSI) method. Structural damage was evaluated at both the detection and localisation levels through global indicators derived from modal properties as well as spatially distributed local indicators. Experimental observations confirmed the development of shear-related cracking patterns consistent with the expected structural behaviour of cross-vaults under lateral actions. The evolution of modal properties provided reliable information on damage progression across loading stages. Furthermore, a comparison of loading conditions revealed differences in the cracking pattern and vibration-based indicators of masonry cross-vaults.