Periodic Reporting for period 2 - HOLAHERIS (A holistic structural analysis method for cultural heritage structures conservation)
Période du rapport: 2024-01-10 au 2025-01-09
Moreover, an innovative integration of structural health monitoring and numerical modelling for decision-making in cultural heritage structures conservation has been pursued by the development of a numerical modelling-based damage diagnostics methodology, as well as by the development of an automatic tool for the real-time prediction of residual displacement capacity and stress increase in damaged masonry walls based on machine learning and numerical modelling, so contributing to damage prognosis (Level IV of structural health monitoring) in masonry and cultural heritage structures.
Furthermore, a two-step sub-modelling procedure which couples limit and pushover analyses considering the actual masonry pattern has been developed to reduce the computational demand in accurate seismic analysis of cultural heritage structures. Additionally, an efficient computational approach based on numerical dissipation has been proposed to simulate the dynamic behavior of rocking blocks, and a damaging block-based model for masonry structures has been extended to dynamic simulations of masonry walls allowing for very accurate predictions.
Finally, advancements have been carried out in modelling environmental deterioration in historic building materials, where a micro-mechanics-based numerical model has been developed to reproduce damage due to salt crystallization pressure in the pores of the material.
All these proposed numerical and structural analysis tools have been developed so that they can be suitably assembled and integrated within a holistic structural analysis method. In particular, these tools will be directly exploited to contribute to the creation of a digital twin of the Garisenda leaning tower in Bologna (Italy), which lately showed structural concerns due to material ageing. HOLAHERIS introduced several scientific novelties which have been published in various peer-reviewed international journal papers and have been disseminated in several national and international scientific conferences.
These advancements appear strategic for European society, given the large number of cultural heritage structures in Europe constantly threatened by earthquakes, soil settlements and material deterioration. Furthermore, the accurate structural assessment of cultural heritage structures is going to minimize the cost and the magnitude of the strengthening interventions, maximizing the authenticity of European heritage, and contributing to sustainability and resilience of built environment. As way of example, the advancements achieved in HOLAHERIS will be exploited to develop and fine-tune a digital twin of the Garisenda leaning tower in Bologna (Italy), which is suffering from material ageing. The new structural analysis method developed in HOLAHERIS for cultural heritage structures conservation will be made available to the wider public of European practitioners and conservation professionals. Since the method will not be specifically based on software packages but on a sequence of operations and data management, its principle can be followed by a large audience.