2024-03-28T17:38:12Z
https://www.fracturae.com/index.php/index/oai
oai:ojs.www.fracturae.com:article/2125
2019-08-28T09:02:01Z
fis:DCEE
"180926 2018 eng "
1971-8993
dc
An on-site teaching laboratory in a village damaged by the 2009 Abruzzo earthquake
Giresini, Linda
Univerisity of Pisa
Sassu, Mauro
University of Cagliari
This paper illustrates a two-year program of summer internships that involved forty students from the School of Engineering (University of Pisa) in 2010-2011. The activity consisted in a systematic survey of damages occurred in a village after the 2009 Abruzzo earthquake and in the preparation of documents addressed to a reconstruction plan. The historical center of San Pio delle Camere (1000 inhabitants) was fully surveyed, including about 140 hypogeal sites. Each student spent at least one month in these activities, funded by study grants provided by the Tuscany Region. Teams of two-three students performed well-defined work packages, led by a tutor, who established roles and functions. The students discussed the progress made preparing a weekly report. Moreover, preliminary structural analyses were carried out to assess the seismic vulnerability of some relevant buildings, fully available to the students. The main results were published in a book presented in a workshop. Most of the results were used to set up the official reconstruction plan of the village. During this on-site laboratory, the students could experience the effects of that destructive earthquake on the population, visiting also the damaged surrounding towns and seeing with their own eyes many cases of structural collapses.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2125
Frattura ed Integrità Strutturale; Vol. 12 No. 46 (2018): October 2018
eng
Copyright (c) 2018 Linda Giresini, Mauro Sassu
oai:ojs.www.fracturae.com:article/2131
2019-08-28T09:02:18Z
fis:DCEE
"180926 2018 eng "
1971-8993
dc
Failure evidences of reduced span bridges in case of extreme rainfalls The case of Livorno
Puppio, Marco Lucio
University of Pisa
Novelli, Sara
University of PISA, Italy
Sassu, Mauro
Università degli studi di Cagliari
The heavy rainfalls occurring in Italy in the last few years focused the attention on the vulnerability of the land and the related infrastructures. Critical situations involving losses of human life and deterioration or failure of relevant structures are frequent. These events were due to: (1) improper land-use; (2) aging of infrastructures, (3) insufficient maintenance and protection; (4) climate changes causing rainstorms similar to tropical events. The failure of small bridges in road networks plays a key role in this sense. The present paper aims to analyse the behaviour of small bridges during rainfalls or floods. In particular, the recent case of Livorno is analysed. The Italian territory has about 460.000 small bridges, mostly designed without the support of technical codes or a proper interaction between the hydraulic and structural aspects. A large part of them can be submerged by water flows during rainfalls and pushed by unexpected actions.
The failure scenarios allow identifying the hydraulic and structural vulnerabilities through a specific survey. A classification of small bridges on the basis of submergibility indexes is eventually proposed.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2131
Frattura ed Integrità Strutturale; Vol. 12 No. 46 (2018): October 2018
eng
Copyright (c) 2018 Marco Lucio Puppio, Sara Novelli, Mauro Sassu
oai:ojs.www.fracturae.com:article/2132
2019-08-28T04:58:25Z
fis:DCEE
"190311 2019 eng "
1971-8993
dc
Damage detection in a reinforced concrete bridge applying wavelet transform in experimental and numerical data
silva, ramon saleno yure rubim costa
university of Brasilia
Palechor, Erwin U. L.
Department of Civil Engineering, University of Brasilia Campus Darcy Ribeiro SG-12 Brasilia, Distrito Federal, Brazil
Bezerra, Luciano M.
Department of Civil Engineering, University of Brasilia Campus Darcy Ribeiro SG-12 Brasilia, Distrito Federal, Brazil
de Morais, Marcus V. G.
Department of Mechanical Engineering, University of Brasilia, Campus Darcy Ribeiro, Brasilia, Distrito Federal, Brazil
da Silva, Welington V.
Department of Civil Engineering, University of Brasilia Campus Darcy Ribeiro SG-12 Brasilia, Distrito Federal, Brazil
In recent years, one can observe a constant worry of the scientific community on the search for demage detection techniques in structures. Such worry contributed to the progressive development of Structural Health Monitoring. This paper purpose a methodology using Continuous Wavelet Transform associated with interpolation and regularization techniques applied in the experimental and numerical mode shapes of the Dogna Bridge using only the demaged responses. The results of the analyses are presented and discussed in this paper.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2132
Frattura ed Integrità Strutturale; Vol. 13 No. 48 (2019): April 2019
eng
Copyright (c) 2019 ramon saleno yure rubim costa silva, Erwin U. L. Palechor, Luciano M. Bezerra, Marcus V. G. de Morais, Welington V. da Silva
oai:ojs.www.fracturae.com:article/2138
2019-08-28T09:03:07Z
fis:DCEE
"180926 2018 eng "
1971-8993
dc
Resonances detected on a historical tower under bells’ forced vibrations
Foti, Dora
Polytechnic University of Bari
Ivorra, Salvador
University of Alicante http://orcid.org/0000-0002-8647-8173
Diaferio, Mariella
Polytechnic University of Bari https://orcid.org/0000-0003-2780-1142
Bru, David
University of Alicante https://orcid.org/0000-0001-7567-1560
Vacca, Vitantonio
Polytechnic University of Bari
Array
The aim of the paper is to perform a preliminary assessment of the dynamic behavior of the bell tower of Basilica Church “S.S. Medici”, one of the most important church in the town of Bitonto, Bari, Italy. The tower is 55 m tall and it is made in reinforced concrete. It is totally disconnected from the main structure of the Church. The structural behavior of the tower has been investigated by performing dynamic experimental tests, which have been executed in two different forcing conditions: recording the vibrations induced only by ambient loads, and, then the ones due to ambient loads and to the excitation produced by the bells. Four bells are housed in the lower bell chamber on a concrete bell frame, four more bells are housed at a higher level bell frame. All the bells are directly connected to the tower and swing in the same direction, so that their movement introduces a dynamic excitation on the tower. The experimental records have detected excessive movements on the tower when bells swing.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2138
Frattura ed Integrità Strutturale; Vol. 12 No. 46 (2018): October 2018
eng
Copyright (c) 2018 Dora Foti, Salvador Ivorra, Prof, Mariella Diaferio, Prof, David Bru, Prof, Vitantonio Vacca, Dr.
oai:ojs.www.fracturae.com:article/2142
2019-08-28T07:06:12Z
fis:DCEE
"181202 2018 eng "
1971-8993
dc
The impacts of type and proportion of five different asphalt modifiers on the low temperature fracture toughness and fracture energy of modified HMA
Fallah Tafti, Mehdi
Associate Professor in Transportation Eng., Civil Engineering Dep., Yazd University
Hoseini Aqda, Seyyed Abuzar
MSc Graduate in Highways and Transportation Engineering, Civil Engineering Department, Faculty of Engineering, Yazd University, Yazd, Iran
Motamedi, Hamed
General Directorate of Roads and Urban Development of Yazd Province, Yazd, Iran
Low temperature fracture toughness and fracture energy are two important measures that could be used to investigate the impacts of using asphalt modifiers on the performance of asphalt pavements in cold regions. The aim of this research was to identify the impacts of using various proportions of five different asphalt modifiers on the fracture toughness and the fracture energy of Hot Mix Asphalts (HMA) under mode I loading and at low environmental temperatures. The asphalt modifiers used for this purpose were: Elastoplastomer Polymer Strings (EPS), Parafiber, Sulfur Polymer, Polyolefin-Aramid Compound Structural Fibers (PACSF) and Sasobit. These modifiers were individually used at three different proportions to produce Semi-circular Bend Specimens containing vertical edge crack. Each specimen was then tested under symmetric monotonic three-point bend loading at -15°C. The results indicated that, except for the EPS, both measures were increased with an increase in the modifier proportion. The most increase in the both measures was observed in the specimens modified with the PACSF, closely followed by specimens modified with the Parafibers. The least increase in these two measures were observed in the specimens modified with the Sulfur Polymer. The results indicated the applicability of examined modifiers to improve the resistance of HMA to crack initiation and crack growth at low temperatures.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2142
Frattura ed Integrità Strutturale; Vol. 13 No. 47 (2019): January 2019
eng
Copyright (c) 2019 Mehdi Fallah Tafti, Seyyed Abuzar Hoseini Aqda, Hamed Motamedi
oai:ojs.www.fracturae.com:article/2152
2019-08-28T09:03:49Z
fis:DCEE
"180926 2018 eng "
1971-8993
dc
Assessment of RC Bridges integrity by means of low-cost investigations
Stochino, Flavio
Università degli studi di Cagliari
Fadda, Maria Luisa
Mistretta, Fausto
Array
Infrastructure aging is an important problem nowadays, in particular for countries like Italy in which the main motorways were built 50 years ago. Huge budgets are necessary to keep infrastructure and bridges in service. In addition, the lack of a proper and timely maintenance, entails an increase of the deterioration and therefore higher costs of repair.
Thus, the need of methods capable of assessing the reliability of the infrastructure in the frame of Bridge Management System (BMS), is patent.
The aim of this work is to provide a robust decision-support tool for the analysis of the data collected within the BMS with field inspection. The innovative aspect of the proposal is the introduction of two factors which take into account the location of the damage, and the mechanical characterization of the material in the definition of a Condition Rating Number (CRN).
The analysis of an existing Reinforced Concrete (RC) bridge network is presented in order to show the accuracy of this new method.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2152
Frattura ed Integrità Strutturale; Vol. 12 No. 46 (2018): October 2018
eng
Copyright (c) 2018 Flavio Stochino, Maria Luisa Fadda, Fausto Mistretta
oai:ojs.www.fracturae.com:article/2153
2019-08-28T07:07:24Z
fis:DCEE
"181205 2018 eng "
1971-8993
dc
Structural Form of Bridges Reflecting the Construction Processes
Mizuno, Yusuke
Nippon Engineering Consultants CO.,LTD.
Kubota, Yoshiaki
Array
The structural form of a completed bridge is strongly affected by its structural form during construction. It follows that innovative construction processes sometimes produce innovative bridge designs. It is important to consider the construction process in conjunction with bridge design methods. This approach could be applied not only to new construction but also to replacements, reconstructions, or reinforcements. One of the authors has systematized the structural forms of bridges and clarified the principles underlying them. This paper aims to extend these principles to construction systems. In other words, changes in the structural systems of the construction processes and systematization of the relationship between a completed bridge and construction process in a design are illustrated. This systematization enables the application of a variety of conventional construction methods in a system. This would be helpful in developing new construction methods and designs for bridges.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2153
Frattura ed Integrità Strutturale; Vol. 13 No. 47 (2019): January 2019
eng
Copyright (c) 2019 Yusuke Mizuno, Yoshiaki Kubota
oai:ojs.www.fracturae.com:article/2154
2019-08-28T09:04:36Z
fis:DCEE
"180926 2018 eng "
1971-8993
dc
Management of multi-source information to identify the typology of the horizontal structures in historical masonry buildings: the case study of the Museum of Capodimonte in Naples (Italy)
Maione, Alessandra
Argiento, Luca Umberto
Casapulla, Claudia
Dept. of Structures for Engineering and Architecture, University of Napoli Federico II
Prota, Andrea
The evaluation of the seismic safety of ancient masonry buildings usually requires compounding the need of preservation of the historical values with the need of achieving a proper level of knowledge of the parameters influencing their structural behaviour. To this aim, non-destructive techniques of instrumental investigation have lately attracted increasing attention, although the provided data are frequently not exhaustive and require to be integrated with different sources of information, such as historical documents and hypotheses of critical interpretation. Therefore, the management of this multi-source information is a crucial aspect in defining a methodological approach to the structural evaluation of the cultural heritage. This paper describes an integrated approach developed in the framework of the Project on the seismic evaluation of the Museum of Capodimonte in Naples (Italy) with reference to the typological identification of the horizontal structures at the first level of the building. The management of the data derived from the application of the infrared thermography, integrated with the information from the visual inspections, the architectural survey and the historic analysis, has allowed obtaining a complete characterization of the structures under study.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2154
Frattura ed Integrità Strutturale; Vol. 12 No. 46 (2018): October 2018
eng
Copyright (c) 2018 Alessandra Maione, Luca Umberto Argiento, Claudia Casapulla, Andrea Prota
oai:ojs.www.fracturae.com:article/2155
2019-08-28T09:04:13Z
fis:DCEE
"180926 2018 eng "
1971-8993
dc
Formulating the in-plane frictional resistances and collapse mechanisms for multi-storey masonry block walls
Argiento, Luca Umberto
Maione, Alessandra
University of Napoli Federico II, Department of Structures for Engineering and Architecture
Casapulla, Claudia
Dept. of Structures for Engineering and Architecture, University of Napoli Federico II
In this paper a macro-block model accounting for frictional resistances is presented to assess the lateral strength of a multi-storey masonry block wall. The kinematic approach of limit analysis is used to define the load factor causing the onset of rocking-sliding mechanism under in-plane horizontal loading. A dry frictional contact condition is assumed at the rigid block interfaces, according to the Coulomb's law with non-associated flow rule. The key aspect of the proposed approach is the introduction of a criterion to evaluate the contribution of the actual frictional resistances depending on the inclination angle of the crack line. An accurate assessment of the frictional resistances is also obtained by distinguishing two different contributions (the wall own weight and additional vertical loads) and their application points. Hence, a sensitivity analysis is performed with respect to the overloading condition, the friction coefficient, and geometrical parameters such as the shape ratios of the wall and the unit block and the number of rows. The analytical results of the proposed model are also validated against results from other existing macro and micro-block modelling approaches in terms of load factor. The comparison confirms the reliability of the proposed model that allows, with similar results, great simplification of the computational effort with respect to micro-block models.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2155
Frattura ed Integrità Strutturale; Vol. 12 No. 46 (2018): October 2018
eng
Copyright (c) 2018 Luca Umberto Argiento, Alessandra Maione, Claudia Casapulla
oai:ojs.www.fracturae.com:article/2163
2019-08-28T07:04:15Z
fis:DCEE
"181202 2018 eng "
1971-8993
dc
Simplified FEM modelling for the collapse assessment of a masonry vault
Olmati, Pierluigi
Sapienza University of Rome
Gkoumas, Konstantinos
Sapienza University of Rome https://orcid.org/0000-0003-3833-6223
Bontempi, Franco
Sapienza University of Rome
This study is motivated from the collapse of an old masonry building in the Southern Italy. FEM analyses are carried out focusing on the influence of the contrasting wall on the stability of the vault. In the analyses, the structure is subjected to a damage scenario on the contrasting wall due to a demolition project, and the consequence of the damage is evaluated using the explicit dynamic simulation made by Ls-Dyna®. A micro modelling technique (discrete FEM model) is adopted to model the masonry: the mortar is modelled by contact surfaces between the masonry units, which are explicitly modelled by blocks of meshes. This modelling technique is proven to be effective to predict the collapse behavior of the structure.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2163
Frattura ed Integrità Strutturale; Vol. 13 No. 47 (2019): January 2019
eng
Copyright (c) 2019 Pierluigi Olmati, Dr, Konstantinos Gkoumas, Dr, Franco Bontempi, Prof.
oai:ojs.www.fracturae.com:article/2164
2019-08-28T07:06:50Z
fis:DCEE
"181202 2018 eng "
1971-8993
dc
Hexagrid-Voronoi transition in structural patterns for tall buildings
mele, elena
university of Naples Federico II
fraldi, massimiliano
Montuori, Gian Maria
perrella, gianpaolo
della vista, vincenzo
Array
In this paper, a first insight into the role that non-conventional structural patterns might play in the design of tall buildings is presented. The idea is to explore the mechanical properties of selected non-conventional structural patterns, in the form of both regular (Hexagrid) and irregular (Voronoi tessellation inspired) arrays, in order to assess their actual applicability in tall building design. For this aim, the concept of Representative Volume Element (RVE) and a classical homogenization-based micromechanical approach are employed for identifying the pattern units and deriving the relevant generalized stress-strain relationships. In the case of irregular patterns based on Voronoi diagrams, obtained by perturbing prescribed key geometrical features of hexagrids, a statistically significant sample of RVEs is defined on the basis of sensitivity analyses, and the related mechanical characterization is developed in statistical terms. Finally, a preliminary stiffness-based design procedure is proposed and applied to a tall building model with Voronoi exoskeleton. In conclusion, a discussion on the effectiveness of the design procedure and on the structural efficiency of the Voronoi patterns for tall buildings is presented
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2164
Frattura ed Integrità Strutturale; Vol. 13 No. 47 (2019): January 2019
eng
Copyright (c) 2019 elena mele, massimiliano fraldi, Gian Maria Montuori, gianpaolo perrella, vincenzo della vista
oai:ojs.www.fracturae.com:article/2175
2019-08-28T07:04:48Z
fis:DCEE
"181202 2018 eng "
1971-8993
dc
Development of a piezoelectric energy-harvesting sensor: from concept to reality
Gkoumas, Konstantinos
European Commission, Joint Research Centre
Bontempi, Franco
Sapienza University of Rome
This study focuses on the development and integrated design over a 24-month period of a high efficiency energy-harvesting (EH) temperature sensor, based on piezoelectric materials, with applications for the sustainability of smart buildings, structures and infrastructures. The EH sensor, harvests the airflow inside Heating, Ventilation and Air Conditioning (HVAC) systems, using a piezoelectric component and an appropriate customizable aerodynamic fin that takes advantage of specific air flow effects, and is implemented for optimizing the energy consumption in buildings. The project was divided in several work-packages (some running in parallel) that cover different aspects of the device development. Some of them focus on engineering aspects (starting from the numerical modeling, then prototyping, and concluding with experimental testing). Other aspects focus on the sensor promotion (including the development of a business plan, the intellectual property rights, the final design and the go-to-market actions). Considering the multidisciplinary character of the project (involving knowledge from fields such as wind engineering, electrical engineering, industrial design, entrepreneurship), this study tries to provide an insight on the complex design issues that arise when such complex, sometimes conflicting and overlapping aspects have to be managed within strict deadlines. In doing so, the most important design and development aspects are critically presented.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2175
Frattura ed Integrità Strutturale; Vol. 13 No. 47 (2019): January 2019
eng
Copyright (c) 2019 Konstantinos Gkoumas, Franco Bontempi, Prof.
oai:ojs.www.fracturae.com:article/2176
2019-08-28T07:05:18Z
fis:DCEE
"181202 2018 eng "
1971-8993
dc
Building irregularity issues and architectural design in seismic areas
Alecci, Valerio
Università di Firenze
De Stefano, Mario
University of Florence
When designing buildings in seismic areas, choices of the architectural designer heavily influences seismic structural performances. Namely, building morphology may lead to complex seismic responses as it occurs when building plan and elevation become irregular. Typical irregularities are due to architectural, functional and distribution constraints, thus leading to plan or vertical or combined plan/vertical irregularities. A frequent plan-wise irregularity arises when earthquake resistant structures, such as cores and shear walls, are concentrated on one side of the building plan, while vertical irregularity often arises from the presence of soft stories especially located at the ground level or, less frequently, at an intermediate level.
In the last decades, some trends in architectural design, such as Deconstructivism and other contemporary theories, worked in pursuing architectural solutions based on the concept of “deconstruction” in place of “construction”, favoring non-rigid schemes, non-regular shapes and, more generally, avoiding geometric rules and classical canons of symmetry and regularity.
In this paper the above issues are investigated with the goal of assessing effects of irregularity conditions, introduced by the architectural design, on the building seismic performances with the aim at not forbidding the designer ambitions but at making him aware of the effects of his architectural choices
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2176
Frattura ed Integrità Strutturale; Vol. 13 No. 47 (2019): January 2019
eng
Copyright (c) 2019 Valerio Alecci, Mario De Stefano
oai:ojs.www.fracturae.com:article/2373
2019-08-28T04:58:53Z
fis:DCEE
"190313 2019 eng "
1971-8993
dc
Parametric analysis on external dissipative link system for seismic protection of low rise r.c. buildings
Puppio, Mario Lucio
University of Pisa
Ferrini, Martina
University of Pisa, Italy
The seismic rehabilitation of existing r.c. and masonry buildings is a topical issue in Civil Engineering. A useful technique consists in the introduction of external bracing system. This kind of intervention can be improved throughout the introduction of dissipative links, here investigated with the help of some examples.. The links are made of common steel profiles: length, geometry and its disposition are considered as design parameters. A general procedure of link-bracing optimization is proposed applying a set of identical external restraints . The adopted dissipative links consent a cheaper and effective design both in terms of ULS than in DLS: the damages are addressed in a small area permitting an easy replacement of the links in case of earthquake.
Gruppo Italiano Frattura (IGF)
2019-03-22 00:00:00
application/pdf
https://www.fracturae.com/index.php/fis/article/view/2373
Frattura ed Integrità Strutturale; Vol. 13 No. 48 (2019): April 2019
eng
Copyright (c) 2019 Mario Lucio Puppio, Martina Ferrini