Practical seismic assessment of unreinforced masonry historical buildings

摘要: Rehabilitation of historical unreinforced masonry (URM) buildings is a priority in many parts the world, since those are living part history and testament human achievement era their construction. Many these still operational; comprising brittle materials with no reinforcements, spatially distributed mass stiffness, they not encompassed by current seismic assessment procedures that have been developed for other structural types. To facilitate difficult task selecting proper rehabilitation strategy - often restricted international treaties non-invasiveness reversibility intervention given practical requirements buildings' intended reuse, this paper presents procedure demands URM mainly constructions lack well-defined diaphragm action. A key ingredient method approximation spatial shape lateral translation, Phi, building assumes when subjected to uniform field acceleration. Using Phi as 3-D function, dynamic response system evaluated, using concepts SDOF continuous systems. This enables determination envelope deformations tendency deformation damage localization throughout examined design earthquake scenario. Deformation specified terms relative drift ratios referring in-plane out-of-plane building's elements. Drift ratio compared capacities associated predefined performance limits. The accuracy introduced evaluated through (a) comparison profiles obtained from detailed time-history analysis suite ten strong ground motion records, five which near-field characteristics, (b) evaluation results observations reported reconnaissance reports two neoclassical torsionally-sensitive buildings, located Thessaloniki, Greece, survived major past.