Wrap-Up Synthesis Model from High-Quality HBIM Complex Models, and Specifications, to Assess Built Cultural Heritage in Fragile Territories (Arquata Del Tronto, Earthquake 2016, the Church of St. Francesco, IT)

The paper intends to define the different levels of quality models achieved to assess architectural heritage in fragile contexts as the earth quaked territories, proposing to reverse the BIM logic ‘simple-to-complex’ in favor of a complex-to-simplex one targeted to HBIM. In order to perform a preservation plan, given the complexity of a damaged heritage, the simplification can’t be the starting point, but the synthesis of the detailed levels of understanding obtained: the case study of St. Francesco church, damaged by the earthquake occurred in 2016, is presented to highlight the deliverables submitted as part of the support to the preliminary preservation design project and decision-making process carried out by the research group of the Politecnico di Milano for the Municipality of Arquata del Tronto. The high level of geometry description acquired by the surveying (TLS, MMS, Photogrammetry) has been finalized to analyze the out-of-plumbs and structural behavior, enriched by the diagnostic analysis detecting the materials and construction techniques, supported the recognition of the stratigraphic volume units and construction phases to better understand the transformations across the centuries integrating the direct data sources with the indirect ones (documents, archives). While in the traditional BIM logic the level of enrichment progressively crosses the Level of Development phases (LOD100-500) by adopting a progressive parallel Level of Geometry (LOG100-500), the paper proposes scales model definition (GOA100-50-20-10) and LOG specifications adapted to the LOD (Design Development, Preservation Plan) reversing the logic and introducing a synthesis model that collects the different analysis, a wrap-up model, to be used together with the detailed high scale models (LOG200-300-400-100), for BIM-to-FEA or BIM energetic analysis, and within LOD600 VR.