Analytical and numerical seismic assessment of heritage masonry towers

The new Italian building code, published in 2018 [MIT in NTC 2018: D.M. del Ministero delle Infrastrutture e dei trasporti del 17/01/2018. Aggiornamento delle Norme Tecniche per le Costruzioni (in Italian), 2018], explicitly refers to the Italian “Guidelines for the assessment and mitigation of the seismic risk of the cultural heritage” [PCM in DPCM 2011: Direttiva del Presidente del Consiglio dei Ministri per valutazione e riduzione del rischio sismico del patrimonio culturale con riferimento alle norme tecniche per le costruzioni, G.U. n. 47 (in Italian), 2011] as a reliable source of guidance that can be employed for the vulnerability assessment of heritage buildings under seismic loads. According to these guidelines, three evaluation levels are introduced to analyse and assess the seismic capacity of historic masonry structures, namely: (1) simplified global static analyses; (2) kinematic analyses based on local collapse mechanisms, (3) detailed global analyses. Because of the complexity and the large variety of existing masonry typologies, which makes it particularly problematic to adopt a unique procedure for all existing structures, the guidelines provide different simplified analysis approaches for different structural configurations, e.g. churches, palaces, towers. Among the existing typologies of masonry structures there considered, this work aims to deepen validity, effectiveness and scope of application of the Italian guidelines with respect to heritage masonry towers. The three evaluation levels proposed by the guidelines are here compared by discussing the seismic risk assessment of a representative masonry tower: the Cugnanesi tower located in San Gimignano (Italy). The results show that global failure modes due to local stress concentrations cannot be identified if only simplified static and kinematic analyses are performed. Detailed global analyses are in fact generally needed for a reliable prediction of the seismic performance of such structures.

[1]  G. Milani,et al.  UB-ALMANAC: An adaptive limit analysis NURBS-based program for the automatic assessment of partial failure mechanisms in masonry churches , 2018 .

[2]  C. Modena,et al.  An “ Innovative ” Procedure for assessing the Seismic Capacity of Historical Tall Buildings : The “ Torre Grossa ” Masonry Tower , 2006 .

[3]  Dina D'Ayala.  Conservation Principles and Performance Based Strengthening of Heritage Buildings in Post-event Reconstruction , 2014 .

[4]  Carlo Atzeni,et al.  Remote Survey of the Leaning Tower of Pisa by Interferometric Sensing , 2010, IEEE Geoscience and Remote Sensing Letters.

[5]  Carmine Galasso,et al.  Earthquake Engineering Field Investigation Team (UK) – Data and Discussion on the 2016 Central Italy Mission , 2017 .

[6]  Gabriele Milani,et al.  Iconic crumbling of the clock tower in Amatrice after 2016 central Italy seismic sequence: advanced numerical insight , 2018 .

[7]  F. Dubois,et al.  Damage assessment of ancient masonry churches stroked by the Central Italy earthquakes of 2016 by the non-smooth contact dynamics method , 2019, Bulletin of Earthquake Engineering.

[8]  Michele Betti,et al.  Time-History Seismic Analysis of Masonry Buildings: A Comparison between Two Non-Linear Modelling Approaches , 2015 .

[9]  M. Fardis,et al.  Designer's guide to EN 1998-1 and en 1998-5 Eurocode 8: Design of structures for earthquake resistance; general rules, seismic actions, design rules for buildings, foundations and retaining structures/ M.Fardis[et al.] , 2005 .

[10]  Gerard Delanty,et al.  European Identity and Architecture , 2002 .

[11]  Gabriele Milani,et al.  Collapse of the clock tower in Finale Emilia after the May 2012 Emilia Romagna earthquake sequence: Numerical insight , 2014 .

[12]  Gabriele Milani,et al.  Role of inclination in the seismic vulnerability of bell towers: FE models and simplified approaches , 2017, Bulletin of Earthquake Engineering.

[13]  Valentina Bonora,et al.  Towers in San Gimignano: Metric Survey Approach , 2017 .

[14]  Francesco Fabbrocino,et al.  Evaluation of different approaches for the estimation of the seismic vulnerability of masonry towers , 2018, Bulletin of Earthquake Engineering.

[15]  Sebastiano D'Amico.  Earthquakes and Their Impact on Society , 2016 .

[16]  Carlo Atzeni,et al.  Assessment of vibration reduction on the Baptistery of San Giovanni in Florence (Italy) after vehicular traffic block , 2011 .

[17]  Karin Ibenholt,et al.  Economic impacts of cultural heritage – Research and perspectives , 2009 .

[18]  Gabriele Milani.  Vulnerability Evaluation of Historical Masonry Structures: Italian Churches and Towers , 2019 .

[19]  Otello Bergamo,et al.  Experimental analysis of the “Saint Andrea” Masonry Bell Tower in Venice. A new method for the determination of “Tower Global Young’s Modulus E” , 2010 .

[20]  Giuseppina Uva,et al.  Comparative seismic vulnerability analysis on ten masonry towers in the coastal Po Valley in Italy , 2013 .

[21]  Jeanine Weekes Schroer,et al.  The Finite String Newsletter Abstracts of Current Literature Glisp User's Manual , 2022 .

[22]  Gabriele Milani,et al.  Seismic assessment of historical masonry towers by means of simplified approaches and standard FEM , 2016 .

[23]  Peter Fajfar,et al.  THE N2 METHOD FOR THE SEISMIC DAMAGE ANALYSIS OF RC BUILDINGS , 1996 .

[24]  E. Ausilio,et al.  Reconnaissance of geotechnical aspects of the 2016 Central Italy earthquakes , 2019, Bulletin of Earthquake Engineering.

[25]  Vladimir Cerisano Kovacevic,et al.  Radar detection of pedestrian-induced vibrations on Michelangelo's David , 2017, PloS one.

[26]  G. Vannucchi,et al.  Geotechnical Aspects in Seismic Soil–Structure Interaction of San Gimignano Towers: Probabilistic Approach , 2017 .

[27]  Carlo Atzeni,et al.  Dynamic Monitoring of Bridges Using a High-Speed Coherent Radar , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[28]  Gianni Bartoli,et al.  Numerical insights on the seismic risk of confined masonry towers , 2019, Engineering Structures.

[29]  Gabriele Milani,et al.  Seismic Assessment of a Medieval Masonry Tower in Northern Italy by Limit, Nonlinear Static, and Full Dynamic Analyses , 2012 .

[30]  Dina D'Ayala,et al.  Definition of Collapse Mechanisms and Seismic Vulnerability of Historic Masonry Buildings , 2003 .

[31]  D. D’Ayala,et al.  Non linear push over assessment of heritage buildings in Istanbul to define seismic risk , 2012, Bulletin of Earthquake Engineering.

[32]  Angelo D'Ambrisi,et al.  Seismic assessment of a historical masonry tower with nonlinear static and dynamic analyses tuned on ambient vibration tests , 2012 .

[33]  Gianni Bartoli,et al.  Dynamic identification of historic masonry towers through an expeditious and no-contact approach: Application to the “Torre del Mangia” in Siena (Italy) , 2014 .

[34]  Carmelo Gentile,et al.  Ambient vibration testing of historic masonry towers for structural identification and damage assessment , 2007 .

[35]  Andrea Vignoli,et al.  Finite Element Modelling for Seismic Assessment of Historic Masonry Buildings , 2016 .

[36]  Salvador Ivorra,et al.  Experimental and Numerical Results from the Seismic Study of a Masonry Bell Tower , 2009 .

[37]  Michele Betti,et al.  Diagonal cracking shear strength of unreinforced masonry panels: a correction proposal of the b shape factor , 2015, Bulletin of Earthquake Engineering.

[38]  D. D’Ayala,et al.  A procedure for the identification of the seismic vulnerability at territorial scale. Application to the Casbah of Algiers , 2014, Bulletin of Earthquake Engineering.

[39]  Stefano Lenci,et al.  Damage Assessment by Numerical Modeling of Sant'Agostino's Sanctuary in Offida During the Central Italy 2016–2017 Seismic Sequence , 2019, Front. Built Environ..

[40]  Gianni Bartoli,et al.  In situ static and dynamic investigations on the “Torre Grossa” masonry tower , 2013 .

[41]  R. Cerioni,et al.  Use of incompatible displacement modes in a finite element model to analyze the dynamic behavior of unreinforced masonry panels , 1995 .

[42]  Gianni Bartoli,et al.  A numerical study on seismic risk assessment of historic masonry towers: a case study in San Gimignano , 2016, Bulletin of Earthquake Engineering.

[43]  Stefano Lenci,et al.  Numerical model upgrading of a historical masonry building damaged during the 2016 Italian earthquakes: the case study of the Podestà palace in Montelupone (Italy) , 2017 .

[44]  Massimiliano Pieraccini,et al.  Extensive Measurement Campaign Using Interferometric Radar , 2017 .

[45]  Giuseppe Brandonisio,et al.  Damage and performance evaluation of masonry churches in the 2009 L’Aquila earthquake , 2013 .

[46]  Gabriele Milani,et al.  Non-linear dynamic and static analyses on eight historical masonry towers in the North-East of Italy , 2016 .

[47]  Gaetano Manfredi,et al.  Seismic Assessment of the Bell Tower of Santa Maria Del Carmine: Problems and Solutions , 2009 .