Monitoring archaeological wooden structures: Non-contact measurement systems and interpretation as average strain fields

摘要: Abstract Large wooden structures of cultural value, such as the Vasa ship, suffer from increasing deformation over time, caused by creep in wood members, time-dependent joints and damage accumulation. In this paper, we discuss suitability different available measurement techniques to monitor structural health structures. particular, a monitoring system needs be able measure exact same point at times displacements. For large objects with limited surface texture, best accuracy for displacement measurements is currently achieved well-defined targets laser-assisted total stations. Furthermore, emphasize relation between displacements advocate translating raw data into more meaningful average strain fields. A straightforward method compute in-plane field presented, illustrated ship. The fields can indicate areas localized strain, e.g. weak zones structure increased creep, or cracking. Such then closely inspected considered improved support.