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Masonry infill walls are widely used as enclosure elements in reinforced concrete (RC) buildings to provide thermal and acoustic insulation. Past earthquakes have identified the masonry infill walls’ out-of-plane collapse as one of the predominant modes of failure. Out-of-plane failure is characterized by brittle behavior and it is, therefore, a threat to human safety. Moreover, the out-of-plane capacity is significantly affected by the presence of cracks due to the in-plane damage related to the interstorey drift. In order to identify the out-of-plane behavior of infill walls depending on the in-plane damage, an experimental campaign based on cyclic quasi-static tests has been initiated on a full-scale infilled RC portal frame at the Laboratory of Structures of the University of Basilicata. The one-bay (4.5 m span), one story (3 m height) frame infilled with two layers of hollow clay brick walls 8 and 12 cm thick, has been subjected to in-plane loading by means of three reversed cycles for each increasing amplitude, until the story drift was equal to 2% and extensive damage occurred to both the infills and the RC members. After each set of three in-plane cycles, a dynamic identification of the infills’ layers has been carried out based on ambient vibrations in order to detect changes in its dynamic behavior. This latter, using nine accelerometers placed on the infills’ surface. The identification tests provided valuable information regarding the out-of-plane (OOP) frequencies during the test as a function of the in-plane drift. The paper describes the results of in-plane tests in correlation with the results of the ambient vibration tests.
Giuseppe Santarsiero; Alessandra De Angelis; Vincenzo Manfredi; Francesco Santamato; Angelo Masi; Marisa Pecce. Out-of-Plane Ambient Vibration Tests of an Infill Wall in RC Frame Subjected to Previous In-Plane Damage. Lecture Notes in Civil Engineering 2021, 205 -218.
AMA StyleGiuseppe Santarsiero, Alessandra De Angelis, Vincenzo Manfredi, Francesco Santamato, Angelo Masi, Marisa Pecce. Out-of-Plane Ambient Vibration Tests of an Infill Wall in RC Frame Subjected to Previous In-Plane Damage. Lecture Notes in Civil Engineering. 2021; ():205-218.
Chicago/Turabian StyleGiuseppe Santarsiero; Alessandra De Angelis; Vincenzo Manfredi; Francesco Santamato; Angelo Masi; Marisa Pecce. 2021. "Out-of-Plane Ambient Vibration Tests of an Infill Wall in RC Frame Subjected to Previous In-Plane Damage." Lecture Notes in Civil Engineering , no. : 205-218.
In Italy as well as in other earthquake-prone countries, the large number of existing buildings requiring seismic retrofitting calls for sustainable solutions able to reduce both costs and downtime. To this purpose, in this paper, the High-Performance Dissipating Frame system (HPDF), a new strengthening solution for the seismic rehabilitation of existing buildings, is presented. HPDF is based on external precast reinforced concrete (RC) frames rigidly connected to the existing structures and equipped with shear damper devices in order to provide high dissipation capacity. The proposed solution permits: (i) to increase sustainability through works made up from the outside without removing/demolishing infills/other non-structural components, (ii) rapid execution by adopting precast resisting members mutually restrained with steel connections, and (iii) effectiveness due to shear damper devices able to dissipate a large amount of shaking energy. In the paper, a displacement-based design procedure is proposed and applied to a numerical example.
Vincenzo Manfredi; Giuseppe Santarsiero; Angelo Masi; Giuseppe Ventura. The High-Performance Dissipating Frame (HPDF) System for the Seismic Strengthening of RC Existing Buildings. Sustainability 2021, 13, 1864 .
AMA StyleVincenzo Manfredi, Giuseppe Santarsiero, Angelo Masi, Giuseppe Ventura. The High-Performance Dissipating Frame (HPDF) System for the Seismic Strengthening of RC Existing Buildings. Sustainability. 2021; 13 (4):1864.
Chicago/Turabian StyleVincenzo Manfredi; Giuseppe Santarsiero; Angelo Masi; Giuseppe Ventura. 2021. "The High-Performance Dissipating Frame (HPDF) System for the Seismic Strengthening of RC Existing Buildings." Sustainability 13, no. 4: 1864.
In this paper, a new strengthening technique is proposed: the Steel Plate Energy Absorption Device (SPEAD) system, which is intended to increase the flexural strength of beam and column members in RC frame structures. In this way, while permitting calibration of the strength increase in the beam to comply with the strength hierarchy criteria needed for a proper seismic behaviour it can provide additional energy absorption. A numerical evaluation of the SPEAD system is carried out by means of a refined 3D model built with an advanced nonlinear finite element program. The SPEAD system has been virtually applied (through finite element analyses) to an RC external beam–column joint, representative of typical existing RC buildings, and the numerical results are compared to those of a specimen that was not upgraded and subjected to the same experimental tests. The SPEAD upgraded model provided a strength increment of about 50% with also a strong reduction of bond-slip effects in the joint panel region. This latter, in turn, provided a beneficial increase of ductility. Based on the positive results from numerical simulations, a design method is also provided.
Giuseppe Santarsiero; Vincenzo Manfredi; Angelo Masi. Numerical Evaluation of the Steel Plate Energy Absorption Device (SPEAD) for Seismic Strengthening of RC Frame Structures. International Journal of Civil Engineering 2020, 18, 835 -850.
AMA StyleGiuseppe Santarsiero, Vincenzo Manfredi, Angelo Masi. Numerical Evaluation of the Steel Plate Energy Absorption Device (SPEAD) for Seismic Strengthening of RC Frame Structures. International Journal of Civil Engineering. 2020; 18 (8):835-850.
Chicago/Turabian StyleGiuseppe Santarsiero; Vincenzo Manfredi; Angelo Masi. 2020. "Numerical Evaluation of the Steel Plate Energy Absorption Device (SPEAD) for Seismic Strengthening of RC Frame Structures." International Journal of Civil Engineering 18, no. 8: 835-850.
Macroseismic intensity data are an important source to learn from historical earthquakes. Nevertheless, this data needs to be converted into more suitable intensity measures to be used in risk analyses, as well as in design practice. To this purpose, in this paper, correlations between macroseismic scales and ground motion parameters have been derived. Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV) and Housner Intensity (IH) as instrumental measures, and European Macroseismic Scale (EMS-98) and Mercalli-Cancani-Sieberg (MCS) as macroseismic measures, have been considered. 179 ground-motion records belonging to 32 earthquake events occurred in Italy in the last 40 years have been selected, provided that for each record, macroseismic intensity in terms of either EMS-98 or MCS or both were also available. Statistical analyses have been carried out to derive both direct (i.e. macroseismic vs instrumental intensity) and inverse (instrumental vs macroseismic intensity) relationships. Results obtained from the proposed relationships have been analyzed and compared with some of the most prominent results available in the technical literature.
Angelo Masi; Leonardo Chiauzzi; Giuseppe Nicodemo; Vincenzo Manfredi. Correlations between macroseismic intensity estimations and ground motion measures of seismic events. Bulletin of Earthquake Engineering 2020, 18, 1899 -1932.
AMA StyleAngelo Masi, Leonardo Chiauzzi, Giuseppe Nicodemo, Vincenzo Manfredi. Correlations between macroseismic intensity estimations and ground motion measures of seismic events. Bulletin of Earthquake Engineering. 2020; 18 (5):1899-1932.
Chicago/Turabian StyleAngelo Masi; Leonardo Chiauzzi; Giuseppe Nicodemo; Vincenzo Manfredi. 2020. "Correlations between macroseismic intensity estimations and ground motion measures of seismic events." Bulletin of Earthquake Engineering 18, no. 5: 1899-1932.
The high number of existing buildings in Italy without adequate seismic and thermal performances requires the definition of integrated retrofitting techniques in order to improve the seismic performance and to reduce energy losses at the same time. On one hand, an integrated approach appears mandatory considering that improving only the energy efficiency of nonseismic buildings leads to an increase of their exposure and, therefore, of their risk in the case of seismic events. On the other hand, seismic strengthening without an adequate thermal assessment and rehabilitation could compromise living comfort and energy maintenance costs. In this context, an application of integrated approach for the rehabilitation of reinforced concrete (RC) existing buildings has been proposed referring to a case study representative of the Italian building stock. Different configurations of infill panels have been considered in order to analyze both energy and seismic performance. Monthly quasi-steady state and hourly dynamic models have been used for the calculation of the energy need of buildings located in different Italian climate and seismic zones. Seismic performances have been evaluated by means of incremental nonlinear dynamic analysis (IDA). As-built and post-retrofit performances have been compared in order to evaluate the effectiveness of the proposed intervention solutions.
Antonio D’Angola; Vincenzo Manfredi; Angelo Masi; Marianna Mecca. Energy and Seismic Rehabilitation of RC Buildings through an Integrated Approach: An Application Case Study. Green Energy Advances 2019, 1 .
AMA StyleAntonio D’Angola, Vincenzo Manfredi, Angelo Masi, Marianna Mecca. Energy and Seismic Rehabilitation of RC Buildings through an Integrated Approach: An Application Case Study. Green Energy Advances. 2019; ():1.
Chicago/Turabian StyleAntonio D’Angola; Vincenzo Manfredi; Angelo Masi; Marianna Mecca. 2019. "Energy and Seismic Rehabilitation of RC Buildings through an Integrated Approach: An Application Case Study." Green Energy Advances , no. : 1.
This study investigates the seismic response of reinforced concrete buildings designed according to the current Italian building code. Number of stories, site hazard, presence and distribution of masonry infill panels, and type of lateral resisting system are the key investigated parameters. The main issues related to design and modeling are discussed. Two Limit States are considered, namely Global Collapse and Usability-Preventing Damage. The main aim of the study is a comparison between the seismic response of the buildings, investigated through nonlinear static and dynamic analyses. Irregularity in the distribution of infill panels and site hazard emerge as the most influential parameters.
Paolo Ricci; Vincenzo Manfredi; Fabrizio Noto; Marco Terrenzi; Crescenzo Petrone; Francesca Celano; Maria Teresa De Risi; Guido Camata; Paolo Franchin; Gennaro Magliulo; Angelo Masi; Fabrizio Mollaioli; Enrico Spacone; Gerardo M. Verderame. Modeling and Seismic Response Analysis of Italian Code-Conforming Reinforced Concrete Buildings. Journal of Earthquake Engineering 2018, 22, 105 -139.
AMA StylePaolo Ricci, Vincenzo Manfredi, Fabrizio Noto, Marco Terrenzi, Crescenzo Petrone, Francesca Celano, Maria Teresa De Risi, Guido Camata, Paolo Franchin, Gennaro Magliulo, Angelo Masi, Fabrizio Mollaioli, Enrico Spacone, Gerardo M. Verderame. Modeling and Seismic Response Analysis of Italian Code-Conforming Reinforced Concrete Buildings. Journal of Earthquake Engineering. 2018; 22 (sup2):105-139.
Chicago/Turabian StylePaolo Ricci; Vincenzo Manfredi; Fabrizio Noto; Marco Terrenzi; Crescenzo Petrone; Francesca Celano; Maria Teresa De Risi; Guido Camata; Paolo Franchin; Gennaro Magliulo; Angelo Masi; Fabrizio Mollaioli; Enrico Spacone; Gerardo M. Verderame. 2018. "Modeling and Seismic Response Analysis of Italian Code-Conforming Reinforced Concrete Buildings." Journal of Earthquake Engineering 22, no. sup2: 105-139.
In Italy, most of the residential buildings (77%) were constructed before 1981, when only 25% of the national territory was classified as seismic. Further, the first provisions addressing thermal performance criteria were introduced in 1991, when about 88% of the existing Italian buildings had already been realized. Therefore, the Italian building stock is characterized by a large deficit in terms of both seismic capacity and thermal insulation. The large number of buildings having inadequate performance, both seismic and thermal, calls for rehabilitation interventions that are based on an integrated and sustainability-oriented approach. In the paper, the influence on seismic performance deriving from some retrofitting techniques, generally adopted to enhance the thermal performance of infill walls, has been evaluated. A common residential RC building representative of existing buildings designed only for vertical loads has been studied. The seismic performances have been evaluated through Incremental Dynamic Analyses (IDA). A first comparison is related to a thermal retrofitting intervention made by replacing the existing masonry infill walls with new elements that are able to ensure an adequate thermal protection. Further, a retrofitting intervention based on the “double skin” technique, where new infilled RC frames are added and connected to the existing ones, has been investigated in terms of seismic and thermal performance.
Vincenzo Manfredi; Angelo Masi. Seismic Strengthening and Energy Efficiency: Towards an Integrated Approach for the Rehabilitation of Existing RC Buildings. Buildings 2018, 8, 36 .
AMA StyleVincenzo Manfredi, Angelo Masi. Seismic Strengthening and Energy Efficiency: Towards an Integrated Approach for the Rehabilitation of Existing RC Buildings. Buildings. 2018; 8 (3):36.
Chicago/Turabian StyleVincenzo Manfredi; Angelo Masi. 2018. "Seismic Strengthening and Energy Efficiency: Towards an Integrated Approach for the Rehabilitation of Existing RC Buildings." Buildings 8, no. 3: 36.
Vincenzo Manfredi; Angelo Masi. Consistency of analysis methods considered in EC8-3 for the seismic assessment of RC existing buildings. Bulletin of Earthquake Engineering 2017, 15, 3027 -3051.
AMA StyleVincenzo Manfredi, Angelo Masi. Consistency of analysis methods considered in EC8-3 for the seismic assessment of RC existing buildings. Bulletin of Earthquake Engineering. 2017; 15 (7):3027-3051.
Chicago/Turabian StyleVincenzo Manfredi; Angelo Masi. 2017. "Consistency of analysis methods considered in EC8-3 for the seismic assessment of RC existing buildings." Bulletin of Earthquake Engineering 15, no. 7: 3027-3051.
Guido Camata; Francesca Celano; Maria Teresa De Risi; Paolo Franchin; Gennaro Magliulo; Vincenzo Manfredi; Angelo Masi; Fabrizio Mollaioli; Fabrizio Noto; Paolo Ricci; Enrico Spacone; Marco Terrenzi; Gerardo Verderame. RINTC PROJECT: NONLINEAR DYNAMIC ANALYSES OF ITALIAN CODE-CONFORMING REINFORCED CONCRETE BUILDINGS FOR RISK OF COLLAPSE ASSESSMENT. Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015) 2017, 1 .
AMA StyleGuido Camata, Francesca Celano, Maria Teresa De Risi, Paolo Franchin, Gennaro Magliulo, Vincenzo Manfredi, Angelo Masi, Fabrizio Mollaioli, Fabrizio Noto, Paolo Ricci, Enrico Spacone, Marco Terrenzi, Gerardo Verderame. RINTC PROJECT: NONLINEAR DYNAMIC ANALYSES OF ITALIAN CODE-CONFORMING REINFORCED CONCRETE BUILDINGS FOR RISK OF COLLAPSE ASSESSMENT. Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015). 2017; ():1.
Chicago/Turabian StyleGuido Camata; Francesca Celano; Maria Teresa De Risi; Paolo Franchin; Gennaro Magliulo; Vincenzo Manfredi; Angelo Masi; Fabrizio Mollaioli; Fabrizio Noto; Paolo Ricci; Enrico Spacone; Marco Terrenzi; Gerardo Verderame. 2017. "RINTC PROJECT: NONLINEAR DYNAMIC ANALYSES OF ITALIAN CODE-CONFORMING REINFORCED CONCRETE BUILDINGS FOR RISK OF COLLAPSE ASSESSMENT." Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015) , no. : 1.
The investigation of the structural characteristics (geometry, structural details, materials quality, etc.) is a crucial step in the assessment of existing reinforced concrete (RC) constructions especially after earthquakes, fire or explosions, increase of live loads, etc. Specifically, the investigation of materials quality can also be required for new constructions in the case of non-conformity of the strength obtained from standard test specimens. Therefore the knowledge of the in-situ mechanical properties of constituent materials (concrete and steel) is a key issue in the evaluation of structural capacity. In order to achieve this goal, destructive (DT; e.g., cores) and non-destructive (NDT; e.g., ultrasonic, rebound) test methods are often adopted, either alone or combined. However, insufficient indications are provided in the current European and Italian codes to permit an effective use of these methods, individually or in combination, during in-situ investigation campaigns. To remedy this, this paper proposes some possible improvements to the current standards paying special attention to the identification of the concrete areas with homogeneous properties within the structure using non-destructive tests (rebound index and direct ultrasonic velocity tests). It also, using a duly selected number of destructive test values (i.e., cores), establishes a multivariate relation between NDT and DT data for each homogeneous area, thus also permitting the estimation of concrete strength in the other points where only NDT tests are provided. Suggestions for the application of the proposed procedure, are provided in the report of a real case.
Angelo Masi; Leonardo Chiauzzi; Vincenzo Manfredi. Criteria for identifying concrete homogeneous areas for the estimation of in-situ strength in RC buildings. Construction and Building Materials 2016, 121, 576 -587.
AMA StyleAngelo Masi, Leonardo Chiauzzi, Vincenzo Manfredi. Criteria for identifying concrete homogeneous areas for the estimation of in-situ strength in RC buildings. Construction and Building Materials. 2016; 121 ():576-587.
Chicago/Turabian StyleAngelo Masi; Leonardo Chiauzzi; Vincenzo Manfredi. 2016. "Criteria for identifying concrete homogeneous areas for the estimation of in-situ strength in RC buildings." Construction and Building Materials 121, no. : 576-587.
This paper outlines the response of the healthcare system in the area mainly affected by the 2012 Emilia earthquake by drawing on specific surveys and information from local health authorities. Some hospitals were evacuated after the M \(_\mathrm{l}\) = 5.8 May 20 seismic event due to damage to non structural components and minor structural damage. A short description of the damage suffered and characteristics of the healthcare system as a whole is offered initially, followed by a detailed description of the effects which took place at the Santa Maria Bianca hospital of Mirandola. The focus has been on damage to non structural elements and content, whose integrity is of primary importance for healthcare structures performance during and after a seismic event. Some instruments for the acquisition of accelerometric data were installed after the May 20 event both outside and inside a building which is part of the hospital complex. The seismic behavior of this building has also been analysed by means of a purposely made finite element model and on the basis of the recorded data. The contribution of undamaged and damaged masonry infills to the global seismic response has also been estimated thus providing some hints on the observed building performance.
Angelo Masi; Giuseppe Santarsiero; Mariarosaria Gallipoli; Marco Mucciarelli; Vincenzo Manfredi; Alberto Dusi; Tony Alfredo Stabile. Performance of the health facilities during the 2012 Emilia (Italy) earthquake and analysis of the Mirandola hospital case study. Bulletin of Earthquake Engineering 2013, 12, 2419 -2443.
AMA StyleAngelo Masi, Giuseppe Santarsiero, Mariarosaria Gallipoli, Marco Mucciarelli, Vincenzo Manfredi, Alberto Dusi, Tony Alfredo Stabile. Performance of the health facilities during the 2012 Emilia (Italy) earthquake and analysis of the Mirandola hospital case study. Bulletin of Earthquake Engineering. 2013; 12 (5):2419-2443.
Chicago/Turabian StyleAngelo Masi; Giuseppe Santarsiero; Mariarosaria Gallipoli; Marco Mucciarelli; Vincenzo Manfredi; Alberto Dusi; Tony Alfredo Stabile. 2013. "Performance of the health facilities during the 2012 Emilia (Italy) earthquake and analysis of the Mirandola hospital case study." Bulletin of Earthquake Engineering 12, no. 5: 2419-2443.