REPAIR AND STRENGTHENING OF HISTORIC MASONRY BUILDINGS IN SEISMIC AREAS (original) (raw)
Related papers
Repair and Strengthening of Historic Masonry Buildings in Seismic Areas, Archi 2000
The 1997 Umbria -Marche earthquake offered a unique opportunity to verify the knowledge on seismic response and on retrofitting strategies of historic masonry structures which have been developed during the last twenty years. Severe damages were in fact suffered also by those buildings that had already been, and in some cases were still being, repaired and strengthenedafter the effects of the previous 1979 earthquake -according to the most updated expertise in this field, as it is expressed by the national recommendations. The study of the actual efficiency of current techniques for repairing and strengthening historic masonry is particularly dealt with in the paper. To this scope, the authors are carrying out extensive surveys on damaged buildings in order to accurately analyze the observed failure mechanisms. The crucial problems of the structure and materials incompatibility that frequently occurred are particularly taken into account.
Repair and strengthening of historic masonry building in seismic area
… the structure of our …, 2001
The 1997 Umbria -Marche earthquake offered a unique opportunity to verify the knowledge on seismic response and on retrofitting strategies of historic masonry structures which have been developed during the last twenty years. Severe damages were in fact suffered also by those buildings that had already been, and in some cases were still being, repaired and strengthenedafter the effects of the previous 1979 earthquake -according to the most updated expertise in this field, as it is expressed by the national recommendations. The study of the actual efficiency of current techniques for repairing and strengthening historic masonry is particularly dealt with in the paper. To this scope, the authors are carrying out extensive surveys on damaged buildings in order to accurately analyze the observed failure mechanisms. The crucial problems of the structure and materials incompatibility that frequently occurred are particularly taken into account.
… to Masonry Buildings: …, 1999
The conservation of historical centres located in seismic areas in South Europe is a very complex problem due to the wide variety of involved aspects, such as the quality of the masonry, the building structural assemblages, the economical and political implications in retrofitting large historic centres. In Italy, an attention to the conservation of old masonry buildings was paid after the Friuli (1976) and Irpinia earthquakes (1980). In fact, up to that time, the building culture developed during the post world war reconstruction appeared to be scarcely interested in maintaining existing masonry buildings, when not of high historical or architectonic value.
2008
This report summarizes the most significant aspects of research financed by the Marche Region’s Scientific and Technical Committee (CTS) for the coordination and re-establishing of post-seismic activities; this research was the result of close collaboration between the Structural, Water, and Soil Engineering Department of the University of L’Aquila, the Marche Region and the National Research Council-Construction Technologies Institute (CNR-ITC) in L’Aquila. Damage and collapse mechanisms and the efficacy of restoration and anti-seismic measures were studied through the analysis and classification of the damage to masonry buildings caused by the Umbro-Marchigiana earthquake of 1997. The efficacy and economical benefit of the techniques used and the strategies adopted to reduce seismic vulnerability were studied in particular detail. The research therefore developed along two lines: damage mechanisms and cost of intervention. This paper summarizes the work and results of this study w...
Applied Sciences
The preservation and definition of the correct retrofitting interventions of historic masonry buildings represents a relevant topic nowadays, especially in a country characterized by high seismicity zones. Considering the Italian Cultural Heritage, most of these buildings are constructed in ancient unreinforced masonry (URM) and showed a high level of vulnerability during the recent 2009 (L’Aquila), 2012 (Emilia Romagna) and 2016 (Centro Italia) earthquakes. In this paper, the seismic assessment of an historic masonry building damaged during 2016 Centro Italia seismic event is presented considering different types of retrofitting interventions. Starting from the results obtained by the post-earthquake survey, different finite element models have been implemented to perform linear and non-linear analyses useful to understand the seismic behaviour of the building and to define the appropriate retrofitting interventions. In particular, reinforced plaster layer and cement-based grout in...
Assessment and Restoration of an Earthquake-Damaged Historical Masonry Building
Frontiers in Built Enviroment, 2019
This paper presents an assessment of the capacity and enhancement of the seismic performance of a historical masonry structure in Plomari, a town on the south coast of Lesbos island in Greece. Owing to uncertainties regarding the properties of the material and the effectiveness of the members in providing lateral resistance, the study was particularly challenging. In addition, the fact that the structure consisted of a variety of structural element types, e.g., unreinforced masonry from natural stones, timber-framed masonry (with burned clay masonry units), and timber girders, while lacking horizontal diaphragms, introduced complexities to the response of the structure in both directions. In the design of the retrofit, the need to preserve the building's architectural and historical value by minimizing interventions posed several problems. To solve them, conventional as well as state-of-the-art strengthening methods are proposed. Moreover, the procedures of these methods are in accordance with the Greek seismic design code of 1959 and European standards (Eurocodes) related to earthquake-resistant masonry as well as guidelines for the design of timber and reinforced concrete. Seismic analyses of the structure were carried out with two different methods (statically applied load and time history analysis) for comparison. The results verify the improvement in its behavior in response to earthquakes as a result of the proposed strengthening methods.
International Journal of Architectural Heritage, 2012
The Abruzzo earthquake hit the city of L'Aquila and its surroundings on the April 6, 2009. The aim of this study is to analyze the technical features of unreinforced masonry (URM) buildings and assess their seismic behavior during the Abruzzo 2009 seismic event. The damage induced in the URM constructions of L'Aquila and the suburbs was severe and several such buildings collapsed. This study includes an overview of the dynamic characteristics of the earthquake and the seismic history of the region. The seismic performance of URM buildings is discussed on the basis of both the experience in L'Aquila and the village of Castelvecchio Subequo, during the post-emergency support to the Italian Department of Civil Protection (Dipartimento della Protezione Civile [DPC]), and the field investigation carried out with the patronage of the EU COST Action C26 and the cooperation of the PLINIVS Centre of Naples in three areas of the old city of L'Aquila. The main characteristics of URM buildings, the building behavior and damage are described and reviewed with due respect to the characteristics of the earthquake, as well as with reference to the structural and non-structural characteristics of buildings, using the Italian MEDEA procedure.
This research is aimed at developing a methodology for the emergency stabilization and restoration of historic buildings damaged by the 2009 Abruzzo earthquake, by means of on-purpose modified injection grouts based on hydraulic binders. Several portions of multi-leaf stone masonry walls from buildings in the towns of Onna, Tempera and Sant'Eusanio Forconese, all located in the province of L'Aquila, were selected for carrying out injection tests with six grouts. Before and after injection, a comprehensive experimental program, including chemical and microstructural tests on original and repair materials and mechanical tests on the masonry walls, was performed. The present contribution describes the tests carried out at the various levels and discusses the main results obtained.
2017
An adequate approach to study the historic masonry buildings must begin with the knowledge and understanding of its structural logic with all its specific peculiarities and vulnerable points, given first by its historic constructive evolution and transformations and then to external causes. Also the global survey of the damage can highlight part of those transformations together with the localization of the most damaged areas. Monitoring selected cracks over time can be very useful to assess the evolution of the damage, avoiding collapses, and to understand the damage causes, useful to design the conservation plan. The accurate intervention of repair and strengthening of the parish church of San Bassiano in Pizzighettone, Cremona, Italy is here presented, where the crack monitoring was carried out to evaluate the partial structural intervention plan, to organize the next intervention phase, anticipating the urgent ones and delaying others, in order to leave open the church
Damage and performance evaluation of masonry churches in the 2009 L’Aquila earthquake
Engineering Failure Analysis, 2013
The seismic behaviour of masonry churches damaged during the 2009 L'Aquila earthquake is studied in this paper. Four important basilicas are considered in order to derive general conclusions from the damage assessment and the performance analysis. As a general result of the comparison between the post-earthquake survey activity and the structural analyses the possibility of evaluating the seismic safety of churches, and therefore of avoiding destructive damage by means of the design and application of appropriate retrofit interventions, is confirmed.