IMT Institutional Repository: No conditions. Results ordered -Date Deposited. 2024-03-29T05:31:41ZEPrintshttp://eprints.imtlucca.it/images/logowhite.pnghttp://eprints.imtlucca.it/2017-09-18T09:41:05Z2017-09-18T09:41:05Zhttp://eprints.imtlucca.it/id/eprint/3785This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/37852017-09-18T09:41:05ZOn the Statics of the Dome of the Basilica of S. Maria Assunta in Carignano, GenoaThe paper deals with the dome of the Basilica of S. Maria Assunta in Carignano in Genoa, designed by Galeazzo Alessi and built in the sixteenth century, for which meridian cracking, rather common in masonry domes, requires the assessment of the dome. In order to set a general procedure for the assessment this structures, limit analysis approaches are here discussed and compared. On the basis of classic limit analysis, local (dome only) and global (dome-drum system) collapse mechanisms are considered considering the different behaviour of several structural elements (lantern, shells of the dome, drum, colonnade). A static (safe theorem) and a kinematic approach are applied to the structure by means of equilibrium limit conditions and kinematically admissible collapse mechanisms. Comparisons between the obtained results are carried out so as to: (i) discuss a general approach to the assessment of dome-drum systems based on both numerical tools and standard limit analyses approaches; (ii) provide a first glance in the assessment of the dome.Andrea Bacigalupoandrea.bacigalupo@imtlucca.itAntonio BrencichLuigi Gambarotta2015-01-21T08:59:32Z2015-01-21T08:59:32Zhttp://eprints.imtlucca.it/id/eprint/2538This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/25382015-01-21T08:59:32ZA simplified assessment of the dome and drum of the Basilica of S. Maria Assunta in Carignano in Genoa Abstract As many masonry domes, the dome of the Basilica of S. Maria Assunta in Carignano in Genoa, designed by Galeazzo Alessi and built in the {XVIth} century, exhibits a relevant crack pattern, consisting mainly of meridian cracks, which puts forward the issue of its safety. Based on Static and Kinematic Theorems of Limit Analysis, a simplified procedure for the assessment of the dome, useful to understand the overall structural behavior, is discussed first looking to kinematically admissible mechanisms and to equilibrated stress fields; the obtained equilibrium states are compared to those from a non-linear {FEM} analysis showing a good agreement. Due to the high redundancy of the structure, this latter issue is dealt with reducing the unknowns to the internal forces in key sections of the dome so that the mechanical response of the dome can be easily described and discussed. The procedure allows the assessment of the dome outlining that: (i) the drum takes part in the collapse mechanism, so that kinematical analysis of the dome only may be not conservative; (ii) hoop ties in the drum, close to the base of the dome shells, plays a crucial stabilizing role; (iii) some parts of the structure, among which the ones prone to environmental degradation, may be crucial for the safety of the dome. Andrea Bacigalupoandrea.bacigalupo@imtlucca.itAntonio BrencichLuigi Gambarotta