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Dr. Antonella Bianca Francavilla
Department of Civil Engineering, University of Salerno, 84084 Fisciano, Italy

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0 Earthquake
0 Finite Element Analysis
0 SAP2000
0 Steel
0 Steel Structures

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Journal article
Published: 29 June 2021 in Applied Sciences
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A vehicular road traffic noise prediction methodology based on machine learning techniques has been presented. The road traffic parameters that have been considered are traffic volume, percentage of heavy vehicles, honking occurrences and the equivalent continuous sound pressure level. Leq A method to include the honking effect in the traffic noise prediction has been illustrated. The techniques that have been used for the prediction of traffic noise are decision trees, random forests, generalized linear models and artificial neural networks. The results obtained by using these methods have been compared on the basis of mean square error, correlation coefficient, coefficient of determination and accuracy. It has been observed that honking is an important parameter and contributes to the overall traffic noise, especially in congested Indian road traffic conditions. The effects of honking noise on the human health cannot be ignored and it should be included as a parameter in the future traffic noise prediction models.

ACS Style

Daljeet Singh; Antonella Francavilla; Simona Mancini; Claudio Guarnaccia. Application of Machine Learning to Include Honking Effect in Vehicular Traffic Noise Prediction. Applied Sciences 2021, 11, 6030 .

AMA Style

Daljeet Singh, Antonella Francavilla, Simona Mancini, Claudio Guarnaccia. Application of Machine Learning to Include Honking Effect in Vehicular Traffic Noise Prediction. Applied Sciences. 2021; 11 (13):6030.

Chicago/Turabian Style

Daljeet Singh; Antonella Francavilla; Simona Mancini; Claudio Guarnaccia. 2021. "Application of Machine Learning to Include Honking Effect in Vehicular Traffic Noise Prediction." Applied Sciences 11, no. 13: 6030.

Journal article
Published: 14 May 2021 in Sustainability
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To reduce environmental noise pollution and to safeguard people’s well-being, it is urgently necessary to move towards sustainable urban development and reconcile demographic and economic growth with the protection and restoration of the environment and the improvement of the quality of human lives. This challenge should be a concern to policymakers, who must issue regulations and define the appropriate actions for noise monitoring and management, and citizens, who must be sensitive to the problem and act accordingly. Starting from an analysis of several crowdsourcing noise data collection tools, this paper focuses on the definition of a methodology for data analysis and mapping. The sound sensing system, indeed, enables mobile devices, such as smartphones and tablets, to become a low-cost data collection for monitoring environmental noise. For this study, the “NoiseCapture” application developed in France by CNRS and IFSTTAR has been utilized. The measurements acquired in 2018 and 2019 at the Fisciano Campus at the University of Salerno were integrated with the kernel density estimation. This is a spatial analysis technique that allows for the elaboration of sound level density maps, defined spatially and temporally. These maps, overlaid on a campus facilities map, can become tools to support the appropriate mitigation actions.

ACS Style

Gabriella Graziuso; Simona Mancini; Antonella Francavilla; Michele Grimaldi; Claudio Guarnaccia. Geo-Crowdsourced Sound Level Data in Support of the Community Facilities Planning. A Methodological Proposal. Sustainability 2021, 13, 5486 .

AMA Style

Gabriella Graziuso, Simona Mancini, Antonella Francavilla, Michele Grimaldi, Claudio Guarnaccia. Geo-Crowdsourced Sound Level Data in Support of the Community Facilities Planning. A Methodological Proposal. Sustainability. 2021; 13 (10):5486.

Chicago/Turabian Style

Gabriella Graziuso; Simona Mancini; Antonella Francavilla; Michele Grimaldi; Claudio Guarnaccia. 2021. "Geo-Crowdsourced Sound Level Data in Support of the Community Facilities Planning. A Methodological Proposal." Sustainability 13, no. 10: 5486.

Journal article
Published: 16 December 2020 in Symmetry
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In the last few decades, increasing efforts have been devoted to the development of beam-to-column connections able to accommodate the local ductility demand dissipating, contemporaneously, the seismic input energy. Among the typologies proposed, the so-called RBS (Reduced Beam Section) has gained wide acceptance in the construction market, leading to easy-to-construct and cost-effective solutions. As an alternative, new proposals based on the inclusion of friction devices in beam-to-column joints have recently been made. Such a practice has the merit, in case of destructive events, of exhibiting wide and stable hysteretic cycles concentrating damage in elements that undergo only minor yielding. Both RBS and friction joints have been widely studied, carrying out experimental tests on sub-assemblies investigating their cyclic rotational response. Nevertheless, the available experimental results on full-scale structures equipped with these connections are still quite limited. This is the reason why two experimental campaigns aimed at performing pseudo-dynamic testing of a full-scale two-storey steel building equipped with RBS and friction connections have been planned at the STRENGTH (STRuctural ENGineering Test Hall) Laboratory of the University of Salerno. The first experimental campaign with the structure equipped with RBSs has already been performed; the connections showed higher resistance than expected, and exhibited brittle fracture due to cyclic fatigue. The second campaign has not yet been carried out, but in this paper the blind analysis of the supposed behavior is reported. It is expected that the friction joints allow to dissipate the seismic input energy without any structural damage in the members, but only through the friction pads of the devices, which can be easily replaced at the end of a severe seismic event.

ACS Style

Sabatino Di Benedetto; Antonella Bianca Francavilla; Massimo Latour; Giovanni Ferrante Cavallaro; Vincenzo Piluso; Gianvittorio Rizzano. Seismic Behavior of Moment-Resisting Frames with Conventional and Innovative Connections. Symmetry 2020, 12, 2091 .

AMA Style

Sabatino Di Benedetto, Antonella Bianca Francavilla, Massimo Latour, Giovanni Ferrante Cavallaro, Vincenzo Piluso, Gianvittorio Rizzano. Seismic Behavior of Moment-Resisting Frames with Conventional and Innovative Connections. Symmetry. 2020; 12 (12):2091.

Chicago/Turabian Style

Sabatino Di Benedetto; Antonella Bianca Francavilla; Massimo Latour; Giovanni Ferrante Cavallaro; Vincenzo Piluso; Gianvittorio Rizzano. 2020. "Seismic Behavior of Moment-Resisting Frames with Conventional and Innovative Connections." Symmetry 12, no. 12: 2091.

Journal article
Published: 18 August 2020 in The Open Civil Engineering Journal
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Background: The performances of composite steel-concrete slabs are strongly influenced by the connection between the concrete and the steel decking, which is essentially assured by bonding, interlocking, and adhesion. The connection can be continuous or localized by means of connectors. In order to increase the bonding between steel and concrete elements and to allow their collaboration, typically, a continuous connection with indentations or embossings is realized. Objective: In this study, the simulation of the concrete-steel bond interaction of a typical composite decking is analyzed. In particular, the objective is the investigation of the role of the main geometric parameters of the indentations or embossings that determine the effective functionality of the connection. Methods: To this scope, the results of four-point bending tests on five specimens of a typical layout of a composite floor are reported and discussed. Then, the obtained results are used to determine the shear bond strength according to the partial interaction method, by following the procedure provided by the Eurocode 4. Successively, the experimental results are exploited in order to calibrate a FE model in Abaqus software to be able to account for the basic effects involved in the shear bonding mechanism, i.e. interlocking, friction, and adhesion. Results & Conclusion: Finally, the obtained results are discussed, and the FE model is used to evaluate the geometrical and mechanical parameters influencing the longitudinal shear bonding resistance.

ACS Style

Antonella B. Francavilla; Massimo Latour; Gianvittorio Rizzano. Experimental and Numerical Analyses of Steel-concrete Composite Floors. The Open Civil Engineering Journal 2020, 14, 163 -178.

AMA Style

Antonella B. Francavilla, Massimo Latour, Gianvittorio Rizzano. Experimental and Numerical Analyses of Steel-concrete Composite Floors. The Open Civil Engineering Journal. 2020; 14 (1):163-178.

Chicago/Turabian Style

Antonella B. Francavilla; Massimo Latour; Gianvittorio Rizzano. 2020. "Experimental and Numerical Analyses of Steel-concrete Composite Floors." The Open Civil Engineering Journal 14, no. 1: 163-178.

Journal article
Published: 30 July 2020 in The Open Construction and Building Technology Journal
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Background: Forthe reliable prediction of the non-linear response of structures, severe seismic events have proven to be a challenging task. Although much non-linear analysis software exists, the accuracy of the results depends on the assumptions made in the characterization of the members. Typically, the analytical models are calibrated using experimental observations. With this scope, experimental research remains the most reliable mean for the assessment of the seismic performance of structures, and it is crucial to target the development of new analytical models and design methods. Objective: Quasi-static tests can provide information on the non-linear behaviour of subassemblies, but it is often difficult to relate the imposed force or displacement histories to those that might occur during an earthquake. The pseudo-dynamic method combines an on-line computer simulation with experimental information about the tested structure, providing the application of realistic dynamic response histories. In this paper, the preliminary analysis and the design of a pseudo-dynamic testing facility for the experimental study of a real scale two storeys-two bays steel MRF, with classical and innovative joint details, are shown. Methods: Pushover and Incremental Dynamic Analyses carried out with Seismostruct software estimate the forces and displacements expected at each storey for the selected ground motions. These analyses have been performed by varying the structural detail of the beam-to-column connections. Results / Conclusion: In this paper, the analytical prediction of the performance of two bays-two storeys steel frames equipped with different solutions of beam-to-column joints is focused. Based on the performed analyses, it has been recognized that steel frames with partial strength joints can provide satisfactory performance under severe seismic actions provided that the joints are adequately designed.

ACS Style

Antonella B. Francavilla; Massimo Latour; Gianvittorio Rizzano. The Design of a Real-Scale Steel Moment-Resisting Frame for Pseudo-Dynamic Earthquake Testing. The Open Construction and Building Technology Journal 2020, 14, 174 -184.

AMA Style

Antonella B. Francavilla, Massimo Latour, Gianvittorio Rizzano. The Design of a Real-Scale Steel Moment-Resisting Frame for Pseudo-Dynamic Earthquake Testing. The Open Construction and Building Technology Journal. 2020; 14 (1):174-184.

Chicago/Turabian Style

Antonella B. Francavilla; Massimo Latour; Gianvittorio Rizzano. 2020. "The Design of a Real-Scale Steel Moment-Resisting Frame for Pseudo-Dynamic Earthquake Testing." The Open Construction and Building Technology Journal 14, no. 1: 174-184.

Journal article
Published: 09 July 2020 in Journal of Constructional Steel Research
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In the case of steel Moment Resisting Frames (MRFs), the adoption of beam-to-column joints equipped with friction dampers represents an efficient alternative to traditional joint typologies. In fact, the introduction of devices able to dissipate the seismic input energy providing only low or negligible damage leads to significant benefits in terms of structural reparability and resilience. Even though in recent times theoretical and experimental efforts have been made to provide a better understanding of the seismic response of these innovative connection typologies, to date no pre-qualified design guidelines are available. In order to fill this knowledge gap, in this paper, exploiting the framework of the pre-qualification procedures proposed by AISC-358, a precise set of design criteria is set up. In particular, step-by-step design guidelines based on the outcomes of previous research works are suggested. The accuracy of the proposed design rules is verified by means of four experimental tests on full-scale subassemblies of beam-to-column joints which have been designed according to the proposed criteria. The experimental work under cyclic loading conditions has regarded two different configurations of friction dampers: i) friction damper plan parallel to the beam flange or ii) friction damper plan parallel to the beam web. The experimental results highlight the accuracy of the proposed rules which provide beam-to-column joints able to sustain large inelastic rotations demands with negligible damage to the non-dissipative joint components.

ACS Style

Antonella B. Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. Design criteria for beam-to-column connections equipped with friction devices. Journal of Constructional Steel Research 2020, 172, 106240 .

AMA Style

Antonella B. Francavilla, Massimo Latour, Vincenzo Piluso, Gianvittorio Rizzano. Design criteria for beam-to-column connections equipped with friction devices. Journal of Constructional Steel Research. 2020; 172 ():106240.

Chicago/Turabian Style

Antonella B. Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 2020. "Design criteria for beam-to-column connections equipped with friction devices." Journal of Constructional Steel Research 172, no. : 106240.

Journal article
Published: 06 August 2018 in Soil Dynamics and Earthquake Engineering
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The experimental activity presented in this work intends to study in detail the cyclic behaviour of a set of three different friction shims preliminary selected in a previous experimental work regarding the behaviour of friction dampers of Sliding Hinge Joints (SHJs). These connections are able to dissipate seismic energy by means of friction through a proper application of capacity design principles. Their bending resistance is proportional to the slip resistance of a friction device which is usually installed at the bottom beam flange and can be governed controlling only two parameters: the friction coefficient and the clamping force of the high strength bolts. The main goal of the experimental campaign presented is to investigate the dependence of the friction coefficient on some of possible significant parameters. In particular, the 51 tests presented are devoted to evaluate the response of the interfaces taking into account the effect of the bolts preloading, the effect of the type of washers and the influence of the random material variability. In detail, the tests have been carried out with four different configurations of washers (with flat washers and disk springs), considering a possible range of values of the clamping forces (between 40% and 100% of the standard proof preload). The results of the experimental activity are reported in the paper proposing a possible definition of the values of the friction coefficients to be used in design and regression analyses of the experimental data of the slip tests to be used in simplified rigid-plastic modelling for seismic analyses.

ACS Style

Giovanni Ferrante Cavallaro; Antonella Bianca Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. Cyclic response of low yielding connections using different friction materials. Soil Dynamics and Earthquake Engineering 2018, 114, 404 -423.

AMA Style

Giovanni Ferrante Cavallaro, Antonella Bianca Francavilla, Massimo Latour, Vincenzo Piluso, Gianvittorio Rizzano. Cyclic response of low yielding connections using different friction materials. Soil Dynamics and Earthquake Engineering. 2018; 114 ():404-423.

Chicago/Turabian Style

Giovanni Ferrante Cavallaro; Antonella Bianca Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 2018. "Cyclic response of low yielding connections using different friction materials." Soil Dynamics and Earthquake Engineering 114, no. : 404-423.

Journal article
Published: 23 March 2018 in The Open Construction and Building Technology Journal
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Background: The deformation capacity of beam-to-column connections strongly influences the robustness of earthquake-resistant Moment Resistant Frames (MRFs) when subjected to a loss-of column scenario. As a consequence, with the aim of foresee the structural response up to the failure, an accurate modelling of the ultimate behaviour of the joints is needed. Objective: In this paper, the influence of the connections on the behaviour of MRFs under a loss-of-column scenario has been analysed considering an accurate modelling of the joints. Method: In addition, in order to achieve this goal, different beam-to-column joints designed for seismic actions and tested at the Salerno University, have been modelled and introduced in a case-study structure, whose response has been evaluated by means of push-down analyses. In particular, the connections analysed and modelled are of three different types: a dog-bone connection, a partial strength Double Split Tee (DST) joint and a partial strength connection with friction dampers. Results / Conclusion: The results of pushdown analyses performed by means of SAP2000 computer software have been examined with the aim to determine the Residual Reserve Strength Ratio (RRSR) index that, combined with the energy balance method proposed by Izzudin et al. (2008), allow to assess the structural ro-bustness.

ACS Style

Antonella Bianca Francavilla; Massimo Latour; Gianvittorio Rizzano; Jean-Pierre Jaspart; Jean-François Demonceau. On the Robustness of Earthquake-Resistant Moment-Resistant Frames: Influence of Innovative Beam-to-Column Joints. The Open Construction and Building Technology Journal 2018, 12, 101 -111.

AMA Style

Antonella Bianca Francavilla, Massimo Latour, Gianvittorio Rizzano, Jean-Pierre Jaspart, Jean-François Demonceau. On the Robustness of Earthquake-Resistant Moment-Resistant Frames: Influence of Innovative Beam-to-Column Joints. The Open Construction and Building Technology Journal. 2018; 12 (1):101-111.

Chicago/Turabian Style

Antonella Bianca Francavilla; Massimo Latour; Gianvittorio Rizzano; Jean-Pierre Jaspart; Jean-François Demonceau. 2018. "On the Robustness of Earthquake-Resistant Moment-Resistant Frames: Influence of Innovative Beam-to-Column Joints." The Open Construction and Building Technology Journal 12, no. 1: 101-111.

Article
Published: 13 September 2017 in ce/papers
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A FREE from DAMage friction connection is a connection where friction dampers are introduced by adding friction pads, sliding on slotted steel plates, pre-stressed with high strength bolts. Even though such a technology provides great advantages in terms of removal of damage to the structural elements, it has the main drawback to provide a limited re-centering capability. In fact, during a seismic loading history, FREEDAM joints rotate concentrating the dissipation in the friction interface but, due to their high stiffness, after the end of the ground motion, they remain in a deformed position, leaving also the structure with residual drifts resulting in out-of-plumbs. The goal of the work is to propose an approach to provide FREEDAM structures with a self-centering capacity by studying particular devices, to be installed in beam-to-column joints or column base joints. In this paper, the attention is focused on the problem of re-centering of base plate joints studying a detail consisting in a connection located at the base of the columns of the first storey equipped with friction dampers and threaded bars. The threaded bars work as elastic springs thanks to sets of Belleville washers used to increase the deformability and to allow the opening of a gap in the connection. The main breakthrough of the proposed technology with respect to the existing literature, aside from the methodology employed for the design of the friction connection, is that the self-centering capability is obtained with re-centering elements (threaded bars and Belleville springs) which are not conceived to be extended up to the end of the column at the top storey of the building, but they have a size similar to the column splice's cover plates. The work reports the results of a preliminary experimental investigation on this joint detail which has regarded cyclic and pseudo-dynamic tests. The experimental results presented seems very encouraging towards the possible development of base plate joints with self-centering capacity combined with friction dampers.

ACS Style

A. Santiago; L. Simoes Da Silva; L.C. Fernandes da Silva; Ferrante Cavallaro G.; A. Francavilla; M. Latour; V. Piluso; G. Rizzano. 11.30: Experimental behaviour of base plate joints equipped with self-centering system and friction dampers. ce/papers 2017, 1, 3082 -3091.

AMA Style

A. Santiago, L. Simoes Da Silva, L.C. Fernandes da Silva, Ferrante Cavallaro G., A. Francavilla, M. Latour, V. Piluso, G. Rizzano. 11.30: Experimental behaviour of base plate joints equipped with self-centering system and friction dampers. ce/papers. 2017; 1 (2-3):3082-3091.

Chicago/Turabian Style

A. Santiago; L. Simoes Da Silva; L.C. Fernandes da Silva; Ferrante Cavallaro G.; A. Francavilla; M. Latour; V. Piluso; G. Rizzano. 2017. "11.30: Experimental behaviour of base plate joints equipped with self-centering system and friction dampers." ce/papers 1, no. 2-3: 3082-3091.

Article
Published: 13 September 2017 in ce/papers
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A FREE from DAMage friction connection is a connection where at the level of the lower beam flange is realized a friction damper by means of angles and plates pre-stressed with high strength bolts. In these connections, the bending moment transferred to the column through the connection can be easily calibrated controlling the friction coefficient of the material employed to realize the friction damper and the value of the preload applied by means of high strength bolts. Therefore, in order to guarantee a correct behaviour of the friction connection both under Serviceability and Ultimate limit states (SLS, ULS), it is necessary to know with a sufficient level of accuracy the value of the static and dynamic friction coefficients and the value of the bolts' preloading.The aim of this paper is to provide a characterization of the friction coefficient of some materials appropriate for the application in the FREEDAM connections. To this scope, the results of an experimental programme consisting of 51 specimens, developed following the guidelines provided by EN 1090-2 and EN 15129 (anti-seismic devices), are presented. The experimental work is mainly devoted to the evaluation of the response of three different materials, applied as a coating on steel plates by means of thermal spray, investigating the influence of the bolt preloading level and of the washer's typology on their response. In particular, the possible influence of the pressure applied to the analysed interfaces is considered carrying out tests at variable values of the pre-loading (between 40% and 100% of the standard pre-loading value), and the influence of the washers' configuration is evaluated performing tests with flat washers and different configurations of series and parallel of Belleville disc springs. The influence of the washer's typology is considered in order to assess the effectiveness of the Belleville disc springs in the reduction of the bolts' loosening during a cyclic test.The main results of the experimental activity are represented in terms of static and kinetic friction coefficients evaluating also the bolt's force degradation, the development of heat during the test and the degradation of the effective damping. Some of the tests are realized with the aim to determine the random variability of the friction coefficient of the analysed interfaces and to provide values of the friction coefficient to be used in design for ULS and SLS.

ACS Style

Giovanni Ferrante Cavallaro; Antonella Bianca Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 01.19: Cyclic behaviour of friction materials for FREEDAM connections. ce/papers 2017, 1, 332 -341.

AMA Style

Giovanni Ferrante Cavallaro, Antonella Bianca Francavilla, Massimo Latour, Vincenzo Piluso, Gianvittorio Rizzano. 01.19: Cyclic behaviour of friction materials for FREEDAM connections. ce/papers. 2017; 1 (2):332-341.

Chicago/Turabian Style

Giovanni Ferrante Cavallaro; Antonella Bianca Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 2017. "01.19: Cyclic behaviour of friction materials for FREEDAM connections." ce/papers 1, no. 2: 332-341.

Article
Published: 13 September 2017 in ce/papers
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The analysis and modelling of the ultimate behaviour of the beam-to-column connections is certainly one of the most studied topics in the field of steel structures. In particular, seismic design of steel frames is commonly carried out to assure the dissipation of the seismic input energy in the so-called “dissipative zones” which have to be properly detailed in order to assure wide and stable hysteresis loops. Once avoided the yielding of columns, beam-to-column joints play a role of paramount importance. In fact, beam-to-column joints can be designed either as Full Strength (FS) or Partial Strength (PS). In the first case, the seismic input energy is dissipated by means of plastic cyclic excursions of the beam ends. In the second case, dissipation requires the plastic engagement of ductile joint components.This paper addresses the design criteria to be adopted to assure a full-strength full-ductility behaviour of Unstiffened Extended End-Plate (U-EEP) beam-to-column joints. The validation of the design procedure is accomplished by three-dimensional finite element analyses with ABAQUS 6.13 software.

ACS Style

Antonella B. Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 01.23: Seismic design of full-strength full-ductility extended endplate beam-to-column joints. ce/papers 2017, 1, 362 -371.

AMA Style

Antonella B. Francavilla, Massimo Latour, Vincenzo Piluso, Gianvittorio Rizzano. 01.23: Seismic design of full-strength full-ductility extended endplate beam-to-column joints. ce/papers. 2017; 1 (2):362-371.

Chicago/Turabian Style

Antonella B. Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 2017. "01.23: Seismic design of full-strength full-ductility extended endplate beam-to-column joints." ce/papers 1, no. 2: 362-371.

Article
Published: 13 September 2017 in ce/papers
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A FREE from DAMage (FREEDAM) friction connection is a particular type of sliding hinge joint where in correspondence of the lower beam flange is realized a friction damper with steel angles and coated plates, pre-stressed with high strength bolts. In order to master the resistance of a FREEDAM connection it is crucial to know accurately the value of the friction coefficient of the materials employed to realize the damper and to control the preload applied to the friction interface by means of high strength bolts.Dealing with this last topic, according to Eurocode 3 and EN 1090-2, High Strength bolts (both of HR or HV type), when installed in friction bearing connections, must be installed based on one of four proposed procedures. The methods currently recommended are torque, combined, HRC and DTI and each of them, as already partially reported in technical literature, can lead to a different level of accuracy. Additionally, once the bolt is tightened it is well known that it undergoes to an “instantaneous” (short-term relaxation) and to a “long-term” loosening that, obviously, may affect the response of the FREEDAM connection which has to be designed not to slip under service loading conditions. Within this framework, the goals of the paper are multiple. First of all, by means of experimental analysis, it is wanted to assess the accuracy of some of the codified tightening methods, namely torque and combined, when applied to FREEDAM connections. Additionally, the possible bolts’ loosening occurring in short/medium periods of time (up to one month) are evaluated performing specific tightening tests. Finally, the effectiveness of Belleville spring washers in keeping the pre-loading constant during the life-time of the FREEDAM connection is assessed. In order to analyse all these aspects, an experimental analysis carried out at the STRENGTH laboratory of the University of Salerno, regarding 84 tightening tests performed on specimens of friction dampers is presented. All the specimens have been tested measuring with annular load cells the initial force applied to the bolts in order to evaluate the achievement of the target preload. Additionally, in some cases, the loss of pre-load over a period of time has been monitored.

ACS Style

Giovanni Ferrante Cavallaro; Antonella Bianca Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 01.18: Optimization of the pre-loading procedure for high-strength bolts of FREEDAM connections. ce/papers 2017, 1, 316 -331.

AMA Style

Giovanni Ferrante Cavallaro, Antonella Bianca Francavilla, Massimo Latour, Vincenzo Piluso, Gianvittorio Rizzano. 01.18: Optimization of the pre-loading procedure for high-strength bolts of FREEDAM connections. ce/papers. 2017; 1 (2):316-331.

Chicago/Turabian Style

Giovanni Ferrante Cavallaro; Antonella Bianca Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano. 2017. "01.18: Optimization of the pre-loading procedure for high-strength bolts of FREEDAM connections." ce/papers 1, no. 2: 316-331.

Article
Published: 13 September 2017 in ce/papers
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Seismic response of steel structures in case of destructive events strongly depends on their ability to dissipate seismic energy. Traditional design of steel Moment Resisting Frames (MRFs) is based on the assumption that this energy is dissipated by steel members or connections. In the former case, full strength joints are adopted and plastic hinges are developed in beam ends while, in the latter case, partial strength connections are adopted, promoting the plastic engagement of some of the connections’ components. In both cases, the design for rare seismic events concedes high levels of damage in some structural parts, requiring high costs for the retrofit. In order to overcome this drawback, recently, the FREE from DAMage design strategy has been proposed as a combination of partial strength and supplementary energy dissipation strategies. Indeed, in previous works, a new joint typology called FREEDAM, has been conceived with the aim to avoid the structural damage (even in case of rare seismic events), thanks to the capacity of the connection to withstand high rotations without developing any plasticization of the steel parts. More specifically, a FREEDAM connection is a connection where friction dampers are introduced at the level of the beam bottom flange. The main feature of this connection is that its resistance and rotational capacity are very easy to control by means of a proper calibration of preload applied to the friction pads with high strength bolts and length of slotted holes, designed to allow the relative movement between the beam and the column. Within this framework, in this paper, the attention is focused on the behaviour of two possible types of FREEDAM connections. In addition, design rules for the friction components of the connections are also discussed. The design procedure is developed in view of application of a hierarchical design, applied at the level of the joint components, able to concentrate energy dissipation in the friction damper and to avoid any damage to all the other parts. The effectiveness of FREEDAM connections is subsequently verified by means of finite element simulations under both monotonic and cyclic loading.

ACS Style

Mario D'aniello; Mariana Zimbru; Massimo Latour; Antonella Francavilla; Raffaele Landolfo; Vincenzo Piluso; Gianvittorio Rizzano. 01.12: Development and validation of design criteria for free from damage steel joints. ce/papers 2017, 1, 263 -271.

AMA Style

Mario D'aniello, Mariana Zimbru, Massimo Latour, Antonella Francavilla, Raffaele Landolfo, Vincenzo Piluso, Gianvittorio Rizzano. 01.12: Development and validation of design criteria for free from damage steel joints. ce/papers. 2017; 1 (2-3):263-271.

Chicago/Turabian Style

Mario D'aniello; Mariana Zimbru; Massimo Latour; Antonella Francavilla; Raffaele Landolfo; Vincenzo Piluso; Gianvittorio Rizzano. 2017. "01.12: Development and validation of design criteria for free from damage steel joints." ce/papers 1, no. 2-3: 263-271.

Article
Published: 13 September 2017 in ce/papers
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Robustness of Moment Resistant Frames (MRFs) designed according to current seismic codes and subjected to a loss-of-column scenario is strictly linked to the deformation capacity of beam-to-column connections, which are usually subjected to combined axial and bending loads. In the seismic design of steel frames, once avoided the yielding of columns, a global dissipative collapse mechanism has to be ensured by imposing the formation of plastic hinges at the ends of the beams or in the connections and guarantying, provided that the elements involved in plastic range have an adequate energy dissipation capacity. Within this framework, the aim of this paper is to analyse the influence of the response of the connections designed for seismic application on the global behaviour of MRFs under a loss-of-column scenario providing an accurate modelling of connections subjected to combined axial and bending loads. To this scope four different beam-to-column joints designed for seismic actions, previously tested under cyclic load history at the STRENGTH laboratory of Salerno University, have been modelled and introduced in a case-study structure, whose response has been assessed by means of push-down analyses. The performances of the analysed frames have been analysed and is compared using the Residual Reserve Strength Ratio (RRSR) index combined with the energy balance method.

ACS Style

Antonella B. Francavilla; Massimo Latour; Gianvittorio Rizzano; Jean-Pierre Jaspart; Jean-François Demonceau. 14.01: Influence of beam-to-column joints on the robustness of earthquake-resistant moment-resistant frames. ce/papers 2017, 1, 3861 -3870.

AMA Style

Antonella B. Francavilla, Massimo Latour, Gianvittorio Rizzano, Jean-Pierre Jaspart, Jean-François Demonceau. 14.01: Influence of beam-to-column joints on the robustness of earthquake-resistant moment-resistant frames. ce/papers. 2017; 1 (2-3):3861-3870.

Chicago/Turabian Style

Antonella B. Francavilla; Massimo Latour; Gianvittorio Rizzano; Jean-Pierre Jaspart; Jean-François Demonceau. 2017. "14.01: Influence of beam-to-column joints on the robustness of earthquake-resistant moment-resistant frames." ce/papers 1, no. 2-3: 3861-3870.

Article
Published: 13 September 2017 in ce/papers
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Accurate response predictions of steel structures subjected to earthquake loading involve the use of models able to simulate properly the cyclic behaviour of the regions where nonlinear phenomena take place. These include hardening, softening, strength and stiffness degradation, pinching and gap closure. In case of full-strength joints, all nonlinear effects appear in the members connected, and particular relevance is assumed by softening and strength degradation. Even though a number of phenomenological models have been developed in the last decades, their calibration seems to have received less attention. Usually, calibration is based on matching the experimental and numerical cyclic responses under loading protocols proposed by standards. These protocols have been developed to give a reliable estimate of the cyclic deformation demand of the considered structural system, since demand strongly depends on the loading history and the hysteretic behaviour when dealing with structural elements characterised by nonlinear behaviour. In general, the accuracy of a numerical model calibrated minimising the discrepancy between experimental and computed response is controlled by the sensitivity of the considered response on the parameters, and since the original aim of loading protocols is not the calibration of numerical models, investigation is needed to assess the predictive capability of so calibrated models. In this work, a calibration procedure based on the minimisation of response discrepancy is presented and critically discussed, with reference to an experimental programme carried out at the University of Salerno. In particular, cyclic, monotonic and pseudo-dynamic tests were carried out on a hollow square member, with the aim of calibrating an advanced phenomenological model. It is shown that a calibration based on cyclic response under ordinary loading protocols only is not robust, since its accuracy under different loading conditions may deteriorate. In particular, loading histories characterised by sudden strong impulses after small-amplitude cycles may involve parameters which are not well represented by ordinary cyclic loading protocols. The introduction of the monotonic test in a multi-objective framework may be effective, and its accuracy is confirmed by the results of pseudo-dynamic tests.

ACS Style

Corrado Chisari; Antonella B. Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano; Claudio Amadio. 11.08: Reliable calibration of cyclic models for steel members. ce/papers 2017, 1, 2887 -2896.

AMA Style

Corrado Chisari, Antonella B. Francavilla, Massimo Latour, Vincenzo Piluso, Gianvittorio Rizzano, Claudio Amadio. 11.08: Reliable calibration of cyclic models for steel members. ce/papers. 2017; 1 (2-3):2887-2896.

Chicago/Turabian Style

Corrado Chisari; Antonella B. Francavilla; Massimo Latour; Vincenzo Piluso; Gianvittorio Rizzano; Claudio Amadio. 2017. "11.08: Reliable calibration of cyclic models for steel members." ce/papers 1, no. 2-3: 2887-2896.