Marco Valente's research while affiliated with Politecnico di Milano and other places

Publications (73)

Article
Recent collapse events of existing reinforced concrete bridges have increased the attention on the mandatory and suitable maintenance of these strategic constructions. In fact, most of these failures were due to an inadequate scheduling of maintenance interventions. One of the main issues concerning the load-bearing capacity of existing reinforced...
Article
Recent earthquakes have highlighted that historical fortified masonry constructions may suffer extensive damage, even under low-to-moderate seismic actions, and corner towers may be one of the most vulnerable structural elements. An accurate assessment of the structural seismic performance is one of the most effective tools to deeply understand and...
Article
Masonry bell towers represent a large portion of the Italian cultural heritage and are highly vulnerable to seismic actions mainly due to their relevant slenderness, as also observed in recent seismic events. The present study investigates the seismic vulnerability and earthquake response of five slender historical masonry bell towers, which are lo...
Conference Paper
A fast two-step procedure for the numerical analysis of curved masonry elements is here proposed. The approach relies on a preliminary kinematic limit analysis by means of consolidated NURBS and mesh adaptation, followed by a non-linear analysis carried out with a discrete model coupled with homogenization procedures. Such an approach allows identi...
Conference Paper
In this paper, the vulnerability of historical masonry aggregates due to local failures is assessed through a novel kinematic limit analysis that is based on NURBS geometry representation and Genetic Algorithm-mesh adaptation. The mesh adaptation allows finding the shape of the collapse mechanism with good precision. The contribution of the most co...
Conference Paper
Masonry is widely employed in the construction of residential buildings due to its relatively cheap cost, particularly in developing countries. However, unreinforced masonry structures present inadequate seismic resistance and are highly vulnerable to horizontal loads. This paper, which is based on the results of an experimental campaign, presents...
Conference Paper
The aim of this paper is to present an automated procedure for the vulnerability assessment of masonry aggregates under horizontal actions through evaluation of local failure mechanisms. The method is developed as follows: realization of a NURBS model of the whole aggregate, definition of an initial mesh of NURBS rigid elements, upper bound limit a...
Article
The structural safety and durability of existing reinforced concrete bridges can be considered as one of the current most important research topics in structural engineering, especially after the numerous collapses that have occurred in recent years. Considering the Italian context, it is important to highlight that most of these structures were bu...
Article
Full-text available
Masonry structures constitute the great majority of buildings in historical centers where construction activities were carried out by adding structural portions to pre-existing ones: as a result, masonry aggregates are currently the most common structural typology in such contexts. The structural behavior of masonry aggregates, which are complex sy...
Article
Recent seismic events in Italy have emphasized the high vulnerability of masonry buildings in historical centers, which were generally erected in continuity to each other over time, resulting in aggregates of constructions. The study of the seismic behavior of masonry aggregates can turn into a very difficult task, usually because of the difficulti...
Article
The evaluation of the seismic behaviour of shallow multi-propped underground structures (e.g. metro stations, parking, etc.) can be considered as one of the most important and actual research topics in structural earthquake engineering. Over the last decades, different types of analysis approaches have been proposed, but several issues are still op...
Article
The dynamic behaviour and the seismic vulnerability of the ancient civic tower of Amatrice, dramatically damaged by the last shocks sequence of 2016 that occurred in Central Italy, is studied in this paper by means of advanced 3D numerical analyses with the Non-Smooth Contact Dynamics Method (NSCD). Thus, a discontinuous approach was used to assess...
Article
Recent earthquakes in Italy have emphasized the high seismic vulnerability of historical masonry constructions and the need of effective retrofitting interventions. This paper investigates the possibility of improving the seismic performance of a historical masonry bell tower using different types of commercial isolators: High Damping Rubber Bearin...
Article
One of the most promising devices for seismic base isolation of structures is the Unbonded Fiber Reinforced Elastomeric Isolator (UFREI) due to its low manufacturing cost and horizontal stiffness. This paper investigates the possibility of combining UFREIs and shape memory alloy (SMA) wires to increase the energy dissipation capacity of the isolati...
Article
This study presents three advanced non-linear modeling strategies for the evaluation of the non-linear behavior under horizontal loads of a historical groin vault of major importance, located in Jerusalem. The vault exhibits the typical features of the Crusaders architecture, with the masonry of the bearing structure, such as the piers and the main...
Article
Historical masonry aggregates represent a large portion of the cultural heritage in Italy and are highly vulnerable to seismic actions, as shown by past seismic events. Typically, they are large and complex structures for which there is a lack of knowledge and information concerning the structural behavior, in particular as far as the response to s...
Conference Paper
Full-text available
Base seismic isolation is one of the efficient technical solutions to reduce the vulnerability of new and existing structures. The designs of the base isolation device have been developed in the past decades by many researchers. In this work, a recycled rubber material derived from industrial waste is used for rubber pad fabrication to reduce signi...
Article
This paper investigates the possibility of improving the seismic performance of a small historical masonry church using fiber reinforced elastomeric isolators in bonded (BFREI) and unbonded (UFREI) applications. Detailed three-dimensional (3D) finite element (FE) models are used to characterize the behavior of the two types of FREIs. An Abaqus User...
Article
Full-text available
The need for seismic protection of structures located in earthquake prone areas of developing countries has motivated several investigations of low-cost seismic isolators in recent years. One of the most promising device is the Unbonded Fiber Reinforced Elastomeric Isolator (UFREI): in UFREIs no bonding or fastening is provided between the bearing...
Article
The seismic response and strengthening of two complex monumental masonry churches located in Northern Italy have been investigated through an advanced macro-modelling FE-based approach. An extensive documentary research and several field surveys have provided a fundamental preliminary knowledge of the two churches. Detailed three-dimensional FE mod...
Article
The preservation (in terms of inhibition of failures and collapses) of architectural heritage against horizontal loads (such as earthquakes) requires an accurate assessment of the non-linear response up to failure: to this aim, the use of advanced numerical tools to perform three-dimensional non-linear dynamic analyses is fundamental. This paper in...
Article
This paper investigates the seismic response and partial failure mechanisms of the Castle of St. George, one of the most renowned monumental constructions of the invaluable cultural heritage in Mantua (Northern Italy), which was hit by the 2012 Emilia seismic sequence. The first part of the study is based on historical analysis, documentary researc...
Article
The seismic performance assessment of historical masonry structures is still a complex issue in civil engineering. This paper investigates the seismic response of seven masonry churches, which are located in the province of Ferrara (Northern Italy) and suffered extensive damage during the 2012 Emilia earthquake. Different field surveys, which were...
Article
Recent Italian earthquakes (L’Aquila 2009, Emilia 2012, Central Italy 2016–2017) have shown the high vulnerability of existing and historical masonry constructions to seismic actions. This article investigates the damage distribution and the seismic response of two masonry churches located in the province of Ferrara (Northern Italy) and severely da...
Conference Paper
Full-text available
The paper provides an insight into the seismic strengthening of masonry towers with horizontal and vertical steel rods by means of a limit analysis approach. The kinematic theorem of limit analysis with five pre-assigned failure mechanisms, observed during post-earthquake surveys, has been implemented for different geometries of idealized towers, a...
Conference Paper
Full-text available
The paper gives a quantitative insight into the vulnerability of existing masonry chimneys located in Spain, accounting for horizontal loads, geometry and material deterioration. During the past two centuries, the industrialization process gave rise to a quick increase in the construction of chimneys, which were made almost exclusively by brickwork...
Conference Paper
Full-text available
The present paper investigates from an advanced numerical point of view the progressive damage of the Amatrice (Rieti, Italy) civic clock tower, after a long sequence of strong earthquakes that struck central Italy in 2016. Two advanced numerical models are here utilised to have an insight into the modalities of progressive damage and the behaviour...
Article
The structural safety and seismic performance assessment of historical masonry churches belonging to cultural heritage is currently a topic of increasing interest in Italy. Recent Italian seismic events have proved that severe damage or collapse can be caused to such typology of structures even by earthquakes of small-to-moderate magnitude. This pa...
Article
The paper provides an insight into the seismic strengthening of masonry towers by means of horizontal and vertical steel tie-rods. The approach is based on the kinematic theorem of limit analysis with pre-assigned failure mechanisms. Among all the possible ones, five of them commonly observed during post-earthquake surveys are selected: (#1) vertic...
Article
Many existing reinforced concrete (RC) buildings were designed in Southern European countries before the introduction of modern seismic codes and thus they may be potentially vulnerable to earthquakes. Recent seismic events have also shown that RC buildings designed without specific seismic provisions can experience several types of failures or eve...
Article
Full-text available
The present paper investigates from an advanced numerical point of view the progressive damage of the Amatrice (Rieti, Italy) civic clock tower, after a long sequence of strong earthquakes that struck central Italy in 2016. Two advanced numerical models are here utilised to have an insight into the modalities of progressive damage and the behaviour...
Article
Full-text available
The paper presents some FE analyses conducted through advanced techniques for the seismic assessment of existing masonry towers. Traditionally, masonry towers were conceived to withstand vertical loads only, but in recent years national and international standards have imposed the evaluation of their structural performance even in presence of horiz...
Article
Full-text available
The paper presents some numerical results on a Romanesque masonry church located in Emilia-Romagna (Italy), a region recently stricken by a devastating seismic sequence on 20th - 29th May 2012. A full investigation of the damages and their comparison with advanced FE analyses, in both linear and nonlinear range are carried out. FE limit analyses ar...
Article
This paper presents some advanced FE analyses conducted on a masonry church damaged by the recent Emilia earthquake, occurred on 20th-29th May 2012. The Nativity of the Virgin Mary parish, located in the province of Ferrara (Italy), was subjected to a post-earthquake strengthening intervention, which consisted of introducing steel profiles, rigid d...
Conference Paper
This paper investigates the effectiveness of reducing the seismic vulnerability of masonry towers by means of innovative and traditional strengthening techniques. The followed strategy for providing the optimal retrofitting for masonry towers subjected to seismic risk relies on preventing active failure mechanisms. These vulnerable mechanisms are p...
Article
The use of fiber reinforced polymers (FRP) represents an interesting option to inhibit the formation of partial collapse mechanisms on macro-blocks, which is a typical failure mode shown by masonry churches under seismic actions. Furthermore, FRP strips exhibit a very good performance at failure, low invasiveness and high speed of execution. This s...
Conference Paper
Many existing reinforced concrete buildings in Southern Europe were built (and hence designed) before the introduction of displacement based design in national seismic codes. They are obviously highly vulnerable to seismic actions. In such a situation, simplified methodologies for the seismic assessment and retrofitting of existing structures are r...
Conference Paper
This study presents some FE results regarding the behavior under horizontal loads of two existing masonry towers located in South-East Lombardy, Italy. The towers, albeit unique for geometric and architectural features, show some affinities that justify a comparative analysis, as for instance the location and the similar masonry material. Their str...
Conference Paper
The paper presents some seismic analyses on three masonry churches located in Emilia-Romagna (Italy), recently stricken by a devastating earthquake sequence from 20th to 29th May 2012. These churches have a similar geometrical configuration, consisting of three naves, a central colonnade and a simple apse. Limit analyses are conducted on the most i...
Article
Full-text available
The architectural heritage was severely damaged by the seismic sequence that occurred in Emilia (Northern Italy) in May 2012. This paper investigates the seismic behavior of three masonry churches that were damaged by the 2012 Emilia earthquake. The analyzed churches are located in the South-East area of the province of Mantua: they are representat...
Article
This paper presents some preliminary results from the numerical investigations of different interventions for the seismic upgrading of a masonry bell tower. Masonry bell towers belong to the cultural and historical heritage, are very widespread in Italy and their conservation has been given special attention in recent years. Their high vulnerabilit...
Article
The structural assessment of historical buildings is a complex and articulated problem based on different activities. This paper describes the different phases of an integrated approach to obtain an accurate knowledge of the structural damage and seismic performance of two masonry Baroque churches located in Northern Italy and hit by the 2012 Emili...
Article
Historical masonry structures are often located in earthquake-prone regions and the majority of them are considered to be seismically vulnerable and unsafe. Historical masonry towers are slender structures that exhibit unique architectural features and may present many inadequacies in terms of seismic performance. The seismic protection of such typ...
Article
Full-text available
The role played by inclination in both the load carrying capacity and seismic assessment of masonry bell towers is investigated through the results obtained from different analyses on three case studies. The Italian Code for the built heritage is not explicit about the influence of inclination on the seismic assessment of towers, leaving to practit...
Article
The Church of the Nativity in Bethlehem has a narthex in the front that is as long as the façade of the Church and about six meters wide. Currently, the narthex is covered by five cross vaults, three of which in a dangerous state of decay, and it is internally divided by three walls perpendicular to the façade, which appears to be strongly rotated...
Chapter
Many existing reinforced concrete buildings were designed in Southern European countries before the introduction of modern seismic codes and thus they are potentially vulnerable to earthquakes. Consequently, simplified methodologies for the seismic assessment and retrofitting of existing structures are required. In this study, a displacement based...
Conference Paper
The paper presents some preliminary results of advanced Finite Element (FE) analyses on the upgrading of old masonry constructions by means of Fiber Reinforced Polymers (FRPs). The case study is a masonry Romanesque church, located in Ferrara, Emilia Romagna (Italy). The church exhibits widespread damage caused by the recent earthquake sequence occ...
Conference Paper
Four inclined masonry towers are investigated in this paper in order to study the behavior under horizontal loads and the role of inclination on the seismic vulnerability. The towers are located in the North-East of Italy, a moderate seismicity region that was recently stricken by an earthquake with two major seismic events of magnitude 5.8 and 5.9...
Article
Full-text available
This paper investigates and compares the seismic performance of two types of innovative repairable fuse devices for earthquake resistant composite steel frames through experimental tests and numerical analyses. The fuses are energy dissipating devices consisting of steel plates that can be welded or bolted to the beam web and bottom flange. The num...
Article
This study presents the main results of the numerical investigations carried out on an innovative repairable fuse device for dissipative beam-to-column connections in moment-resisting composite steel frames. The fuse consists of steel plates bolted to the web and bottom flange of the beam with a specifically detailed gap in the concrete slab. The b...
Article
In this paper a masonry baroque church by Antonio Galli Bibiena in Villa Pasquali is analyzed using a multidisciplinary approach. The importance of this monument is due to the prestige of its architect and to the peculiar system of masonry perforated vaults, which is an unicum in architectural history. Nevertheless, until now this church has not be...
Article
Full-text available
This paper presents some preliminary results of seismic analyses performed on a masonry church located in Emilia-Romagna (Italy). The church suffered damage during the seismic events occurred in 2012 and some seismic upgrading interventions by means of Fiber Reinforced Polymers (FRPs) are proposed. The behavior of the church is investigated under h...
Article
The behavior of eight historical masonry towers, located in the North-East region of Italy, is analyzed under horizontal loads by means of detailed 3D FE models. The geometry of the towers is deduced from both existing available documentation and in-situ surveys. The towers, albeit unique for geometric and architectural features, show some affiniti...
Article
The seismic vulnerability assessment of eight historical masonry towers, located in the North-East region of Italy, is carried out by means of simplified approaches. Three-dimensional finite element models of the eight towers are created on the basis of geometrical data deduced from both existing available documentation and insitu surveys. First, p...
Article
An innovative repairable fuse device for moment-resisting composite steel frames is numerically investigated in this study developed within the European research project “Fuseis”. The fuse device consists of steel plates welded to the web and bottom flange of the beam with a specifically detailed gap in the concrete slab. In case of damage after a...
Conference Paper
This study presents some FE results regarding the behavior under horizontal loads of eight existing masonry towers located in the North-East of Italy. The towers, albeit unique for geometric and architectural features, show some affinities which justify a comparative analysis, as for instance the location and the similar masonry material. Their str...
Article
This study presents a detailed failure analysis of seven masonry churches, which were severely damaged during the 2012 Emilia-Romagna (Italy) seismic sequence, by means of 3D FE non-linear dynamic analyses. The main aims of the numerical investigations are: 1) to carry out a sufficiently wide sensitivity study on different specific case studies to...
Article
This study presents some results of a comprehensive numerical analysis on three masonry churches damaged by the recent Emilia-Romagna (Italy) seismic events occurred in May 2012. The numerical study comprises: (a) pushover analyses conducted with a commercial code, standard nonlinear material models and two different horizontal load distributions;...
Article
The most suitable way to perform a fast but reliable failure analysis of existing masonry churches in earthquake prone areas is investigated in order to predict the state of damage and eventually failure modes. Different failure analyses are systematically applied on a wide variety of different churches, that suffered damage during the recent 2012...

Citations

... Highly corroded bridge piers can be subjected to nonuniform corrosion with corrosion pit which was not considered in the simplified FEM model. Rebar corrosion significantly affects the structural behavior of RC structures (Berto et al., 2009;Crespi et al., 2020;Crespi et al., 2022;G. M. et al., 2018) and it is important to consider mechanical damages caused by corrosion products and related cracking in the surrounding concrete (Coronelli and Gambarova, 2004). ...
... The macro modeling technique is one of the commonly used masonry structural modeling techniques in the literature. The historical masonry bell towers in South-East Lombardy in Italy [63], historical fortified masonry palaces in Switzerland and Northern Italy [64], Emir Bayındır Bridge in Turkey [65], San Pietro and San Benedetto churches in Italy [66], Torre De la Vela in Spain [67], Gaskar brick minaret in Iran [68] and five historical masonry minarets in Antalya (Turkey) [69] are some of the studies examining the seismic behavior of different types of structures using this type of structural modeling technique. While doing this type of modeling, analyses are carried out without making any distinction between the binding material (mortar, etc.) used in the building and the structural elements. ...
... One additional problem is that the relevant codes do not provide detailed guidance on the building blocks. Due to the complex behavior of block buildings and large number of users which implies a higher risk, it is crucial to assess safety and seismic vulnerability [3]. ...
... The macro modeling technique is one of the commonly used masonry structural modeling techniques in the literature. The historical masonry bell towers in South-East Lombardy in Italy [63], historical fortified masonry palaces in Switzerland and Northern Italy [64], Emir Bayındır Bridge in Turkey [65], San Pietro and San Benedetto churches in Italy [66], Torre De la Vela in Spain [67], Gaskar brick minaret in Iran [68] and five historical masonry minarets in Antalya (Turkey) [69] are some of the studies examining the seismic behavior of different types of structures using this type of structural modeling technique. While doing this type of modeling, analyses are carried out without making any distinction between the binding material (mortar, etc.) used in the building and the structural elements. ...
... In general, it was observed that several historical centres are characterized by an ancient building heritage having an inadequate safety level against earthquakes. In the urban centres, the existing construction typologies are frequently grouped in aggregate configurations, and the constructive matrix of structural units (SUs) is the living representation of a well-consolidated design practice that is very vulnerable to seismic actions [7][8][9][10]. ...
... Highly corroded bridge piers can be subjected to nonuniform corrosion with corrosion pit which was not considered in the simplified FEM model. Rebar corrosion significantly affects the structural behavior of RC structures (Berto et al., 2009;Crespi et al., 2020;Crespi et al., 2022;G. M. et al., 2018) and it is important to consider mechanical damages caused by corrosion products and related cracking in the surrounding concrete (Coronelli and Gambarova, 2004). ...
... Furthermore, the typical cracking propagation of shear cracks around openings by the reduction of the resisting area and attraction of stresses, vertical cracks at the corners of frontal façades by pounding forces and global collapse of vaults and domes by the lateral vibration of the supports. Different failure mechanisms have been studied and presented in detail for several researchers around the world leading with the seismic performance of massive masonry Churches and bell towers (Lagomarsino et al. 2002;Peña et al. 2012;Pantò et al. 2016;Preciado et al., 2016;Valente and Milani 2018;Malena et al. 2019;Díaz-Fuentes et al. 2021), as well as other old masonry buildings (Lourenço and Karanikoloudis, 2018;Novelli and D'Ayala, 2019;Vlachakis et al. 2020;Grillanda et al., 2020;Valente 2022). This section presents a summary of the main observed failure mechanisms due to in-plane and out-of-plane loading in different structural elements through a schematic representation of crack propagation (see Tables 2-3). ...
... Due to the critical effects on conducting rapid seismic performance assessments in preventive preservation of architectural heritage, at present, the nonlinear static pushover (NSP) method, which can efficiently avoid thousands of iterations in a nonlinear inelastic time history analysis [43], has been applied to the seismic analysis of many historical relics with masonry structures in the past 10 years [44,45]. For the NSP method, incremental lateral loads along the height of the structure are applied in different ways to the structure until the structure reaches a predetermined target displacement or overturn. ...
... They found that reinforcing the liquefiable soil beneath the metro station by the injection grouting method could effectively reduce the structural uplift. The effects of pulse-like earthquake motions [27], column reinforcement ratio [28], soil shear modulus (related to the shear wave velocity) [29,30], and soil-rock interface position [31] on structural seismic responses have also been investigated. ...
... It is possible to observe that two churches (15%) are located in zone I, five churches (39%) are located in zone II and the remaining six churches (46%) are located in zone III. The main plan layout of the churches is reported in Fig. 3 where they are collected according to the classification (small, intermediate and large size) introduced in [36]. ...