Validation of Simplified Micro-models for the Static Analysis of Masonry Arches and Vaults

Compared to simple masonry walls, numerical modelling of masonry vaulted structures is particularly complex due to their three-dimensional curved geometry and articulated masonry pattern. Moreover, the scarce availability of experimental data makes it difficult to validate numerical models for these types of structures. Recently, the simplified micro-modelling approach has been applied by different authors, despite some intrinsic limits, such as huge numerical effort and adoption of ad-hoc written numerical codes. The aim of this study is to overcome these difficulties by using a commercial software with built-in friction interface models and to validate the proposed simplified-micro model through experimental tests on in-scale specimens of arch and cross vault. The proposed approach has shown promising features: experimental results have been numerically reproduced with a high degree of accuracy, both in case of planar and space structures, with both dry and mortar joints. The final result of the study is a validated modelling strategy that could be confidently applied to real masonry vaulted structures

Seismic in-plane displacement capacity of masonry barrel vaults: the role of constructive aspects

Historic masonry vaults are one of the most vulnerable elements with respect to the seismic action. Cracks are often detected after post-earthquake surveys. However, it is difficult to directly link the observed damage to causes. Different mechanisms can occur during an earthquake, such as in-plane horizontal shear distortion or longitudinal opening/closing of the abutments. These mechanisms are not necessarily associated to a specific crack pattern, since other factors are involved in the determination of the detected crack status. Among these factors, constructive aspects (such as the brick pattern) play a major role. This study aims at investigating the possible correlation between constructive aspects and the crack pattern in barrel vaults subjected to in-plane shear mechanism. Numerical simulations are carried out on an ideal circular vault with a rectangular base of dimensions 3.1x5.3 m, and rise of 1.175 m. Three brick patterns are considered: radial, diagonal and vertical. In order to investigate these aspects, a micromodelling numerical approach has been adopted. Results are presented in terms of ultimate displacement capacity, collapse mechanisms and crack pattern charts

Investigation of the Role of Constructive Aspects on the Structural Response of Masonry Vaults

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Reality-Based FE Block Models of Masonry Cross Vaults: A Real Case Study

Nowadays, it is crucial to develop analysis methodologies to confidently simulate the structural behaviour of historical masonry constructions. From this perspective, the possibility of using reality-based models as starting data is becoming increasingly attractive. This methodology allows considering some aspects that are usually neglected in the analysis of masonry structures, e.g., the as-built geometry and the block arrangement. This study investigates the implications of applying this approach to a case study: the Palazzata di Vicoforte in Piedmont, Italy. Starting from dense point clouds obtained through LiDAR acquisitions and photogrammetric surveys, a very accurate NURBS modelling has been performed to develop Finite Element micro-Models of two cross vaults characterized by very similar macro-geometry, but different brick pattern. The models are numerically analysed under differential abutment settlements. Comparison of the results obtained from vaults of ideal geometry shows the importance of accurately modelling both macro and micro geometry