Alberto Viskovic

Masonry Panels Composite Reinforcements with Epoxy Matrix, Inorganic Mortar Matrix and PS Polymer Matrix

The study mainly deals with methods of historical masonry panels reinforcement, carried out with composite materials and with comparisons among these methods [1, 2, 3]. More in detail, in the last decade an innovative method of structural strengthening of masonry panels was proposed and tested, represented by recently developed composite structural reinforcements with polyurethane matrix [3] and here are carried out comparisons with the previous ones [1, 2].

Quick Seismic Protection of Weak Masonry Infilling in Filled Framed Structures Using Flexible Joints

This paper deals with research related to repair and strengthening of weak and brittle masonry infills in R.C. or steel frame structures. Masonry infills are commonly used in 20th century architectural heritage residential and office buildings. In case of earthquake damage to the weak and brittle masonry infills the commercial buildings go out of service and residents of residential buildings are prohibited from living in their homes although the main frame structure is not damaged. The new retrofitting method proposed in this paper may be either a preventive seismic improvement or a quick emergency intervention before seismic aftershocks: it is proposed to use a polymer PM to fill new horizontal and vertical joints between infilling masonry and frame or to fill cracks generated by the earthquake. The test results presented in the paper confirmed ability of polymer PM to fulfil requirements of quick repair material for seismic area.

On Site Surveying of a Historical Structure for Numerical Models Development and Seismic Retrofitting Design

The restoration of the building heritage in the Abruzzo Region (Italy) is related to a detailed analysis of the technical and constructive aspects in the minor architecture of its historic centers. This paper describes the studies carried out for the recovery and seismic improvement of an aggregate in the historical center of Celano (AQ). The theme offered the opportunity to experience the potential of new digital imaging techniques with the use of “FARO-Focus3D” laser scanners based on acquisition of “phase-shift” points and integrated with HDR photography. The laser scanner provided a virtual model of the structure while the HDR cameras provided information to characterize the individual constructive elements. The cognitive framework obtained with the new technology has been a valuable tool in designing retrofitting interventions. The 3D laser scanner relief detected the constructive vertical misalignments of the bearing walls and allowed to evaluate the degradation of the materials and the crack patterns. Complementarily, the surveys and the experimental tests have given the possibility to determine the mechanical and constructive characteristics of its masonry. Thanks to these studies, useful numerical “pre and post-intervention” models for the design phases were developed. The level of safety, starting from a minimum pre-intervention safety coefficient of 0.18%, reached a post-intervention coefficient of 0.61% (respect to a full safety one required for a new building) that has guaranteed the seismic practicability of that historical structure.

The Structural Analyses And RestorationProjects For The St. Francis, St. Claire AndSt. Mary Of The Angels Basilicas In Assisi

This paper deals with the problem of seismic strengthening and of the restoration of the structures of the St. Francis, St. Claire, and St. Mary of the Angels Basilicas. To accomplish this objective it was necessary to carry out an historical survey, accurate direct observation (intergrated with investigation) and some mathematical models which can be divided into two groups: in the first phase global models of the Basilicas were made and analysed, within elastic field, under seismic actions (applied as static equivalent),to verify the position of the critical zones; in the second phase, to test the interventions designed, some local mathematical models, with non-linear behaviour, were carried out with static equivalent seismic actions applied step by step. The interventions include original solutions, respecting the high artistic value of the buildings.