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Marco Fasan
Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy

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Journal article
Published: 18 August 2021 in Sustainability
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Current standards for seismic-resistant buildings provide recommendations for various structural systems, but no specific provisions are given for structural glass. As such, the seismic design of joints and members could result in improper sizing and non-efficient solutions, or even non-efficient calculation procedures. An open issue is represented by the lack of reliable and generalized performance limit indicators (or “engineering demand parameters”, EDPs) for glass structures, which represent the basic input for seismic analyses or q-factor estimates. In this paper, special care is given to the q-factor assessment for glass frames under in-plane seismic loads. Major advantage is taken from efficient finite element (FE) numerical simulations to support the local/global analysis of mechanical behaviors. From extensive non-linear dynamic parametric calculations, numerical outcomes are discussed based on three different approaches that are deeply consolidated for ordinary structural systems. Among others, the cloud analysis is characterized by high computational efficiency, but requires the definition of specific EDPs, as well as the choice of reliable input seismic signals. In this regard, a comparative parametric study is carried out with the support of the incremental dynamic analysis (IDA) approach for the herein called “dynamic” (M1) and “mixed” (M2) procedures, towards the linear regression of cloud analysis data (M3). Potential and limits of selected calculation methods are hence discussed, with a focus on sample size, computational cost, estimated mechanical phenomena, and predicted q-factor estimates for a case study glass frame.

ACS Style

Silvana Mattei; Marco Fasan; Chiara Bedon. On the Use of Cloud Analysis for Structural Glass Members under Seismic Events. Sustainability 2021, 13, 9291 .

AMA Style

Silvana Mattei, Marco Fasan, Chiara Bedon. On the Use of Cloud Analysis for Structural Glass Members under Seismic Events. Sustainability. 2021; 13 (16):9291.

Chicago/Turabian Style

Silvana Mattei; Marco Fasan; Chiara Bedon. 2021. "On the Use of Cloud Analysis for Structural Glass Members under Seismic Events." Sustainability 13, no. 16: 9291.

Conference paper
Published: 11 January 2021 in Lecture Notes in Civil Engineering
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The prevention of unfavourable machine-induced vibrations represents a crucial issue for the design of industrial facilities. A special attention is required for the structural assessment of the load-bearing members, that should be optimally designed with the support of specific input parameters. The characterization of the expected vibration sources, together with a reliable structural model, is in fact a key step for the early design stage. In this paper, a case-study eyewear factory is investigated. Its layout takes the form of a two-span, two-story precast concrete frame. The lack of customer/designer communication resulted in various non-isolated Computer Numerical Control (CNC) vertical machinery centers mounted on the inter-story floor. Accordingly, the floor started to suffer for severe resonance issues. This research study focuses on the dynamic investigation of the structure. An efficient, coupled experimental-numerical approach is presented and validated for early predictive studies. Based on field experiments on the floor, but also on the machinery components, the most unfavourable conditions are first detected and characterized with the support of accelerometers and video-tracking displacement acquisitions. The experimental outcomes are then further assessed with Finite Element (FE) numerical models, giving evidence of the accurate predictability of resonance issues.

ACS Style

Chiara Bedon; Enrico Bergamo; Marco Fasan; Salvatore Noé. Assessment of CNC Machine-Induced Vibrations on an Industrial Inter-story Floor. Lecture Notes in Civil Engineering 2021, 306 -315.

AMA Style

Chiara Bedon, Enrico Bergamo, Marco Fasan, Salvatore Noé. Assessment of CNC Machine-Induced Vibrations on an Industrial Inter-story Floor. Lecture Notes in Civil Engineering. 2021; ():306-315.

Chicago/Turabian Style

Chiara Bedon; Enrico Bergamo; Marco Fasan; Salvatore Noé. 2021. "Assessment of CNC Machine-Induced Vibrations on an Industrial Inter-story Floor." Lecture Notes in Civil Engineering , no. : 306-315.

Conference paper
Published: 23 November 2020 in Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications
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Machine-induced vibrations and their control represent, for several reasons, a crucial design issue for buildings, and especially for industrial facilities. A special attention is required, at the early design stage, for the structural and dynamic performance assessment of the load-bearing members, given that they should be optimally withstand potentially severe machinery operations. To this aim, however, the knowledge of the input vibration source is crucial. This paper investigates a case-study eyewear factory built in Italy during 2019 and characterized by various non-isolated computer numerical control (CNC) vertical machinery centers mounted on the inter-story floor. Accordingly, the structure started to suffer for pronounced resonance issues. Following the past experience, this paper reports on the efficiency of a coupled experimental-numerical method for generalized predictive and characterization studies. The advantage is that the machinery features are derived from on-site experiments on the equipment, as well as on the floor. The experimental outcomes are then assessed and integrated with the support of Finite Element (FE) numerical simulations, to explore the resonance performance of the floor. The predictability of marked resonance issues is thus analyzed, with respect to the reference performance indicators.

ACS Style

Enrico Bergamo; Marco Fasan; Chiara Bedon. Predictivity of CNC Machine-Induced Vibrations on Inter-Story Floors Based on Coupled Experimental-Numerical Investigations. Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications 2020, 64, 15 .

AMA Style

Enrico Bergamo, Marco Fasan, Chiara Bedon. Predictivity of CNC Machine-Induced Vibrations on Inter-Story Floors Based on Coupled Experimental-Numerical Investigations. Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications. 2020; 64 (1):15.

Chicago/Turabian Style

Enrico Bergamo; Marco Fasan; Chiara Bedon. 2020. "Predictivity of CNC Machine-Induced Vibrations on Inter-Story Floors Based on Coupled Experimental-Numerical Investigations." Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications 64, no. 1: 15.

Journal article
Published: 29 October 2020 in Structures
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The usual seismic design of buildings, based on current codes of practice, does not account for the occurrence of seismic sequences. Structures are designed to resist one single earthquake and then it is supposed that, before the following event, there is enough time to retrofit the damaged construction. This paper investigates the effects of seismic swarms on single storey Concentric X-Braced steel Frames, a very common construction system for industrial buildings. The selected seismic sequences have been chosen so that the first event is considered as the mainshock, and following events have a similar or greater PGA (Peak Ground Motion). The sequences can represent a swarm or a sequence of earthquakes spaced over time, occurring before the structures are retrofitted. The investigation of the effects on steel frames has been conducted in a simplified way through the analysis of Single Degree Of Freedom (SDOF) systems with a behaviour calibrated on the response of Multi-Degree Of Freedom (MDOF) real Concentrically Braced Frames (CBFs). One of the main focuses of this work is on the additional ductility to be used in the seismic design to account for the effects of seismic sequences. For this purpose, the 95th percentile of the required ductility ratio has been calculated in the typical fundamental frequency range of single storey concentric braced steel frames, as to estimate the increase of ductility or strength to be adopted in design. As a result, a reduction of behaviour factor up to 37% has been found.

ACS Style

Giovanni Rinaldin; Marco Fasan; Ljuba Sancin; Claudio Amadio. On the behaviour of steel CBF for industrial buildings subjected to seismic sequences. Structures 2020, 28, 2175 -2187.

AMA Style

Giovanni Rinaldin, Marco Fasan, Ljuba Sancin, Claudio Amadio. On the behaviour of steel CBF for industrial buildings subjected to seismic sequences. Structures. 2020; 28 ():2175-2187.

Chicago/Turabian Style

Giovanni Rinaldin; Marco Fasan; Ljuba Sancin; Claudio Amadio. 2020. "On the behaviour of steel CBF for industrial buildings subjected to seismic sequences." Structures 28, no. : 2175-2187.

Journal article
Published: 16 September 2020 in Actuators
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Machine-induced vibrations represent, for several reasons, a crucial design issue for industrial buildings. At the early design stage, special attention is thus required for the static and dynamic performance assessment of the load-bearing members, given that they should optimally withstand ordinary design loads but also potentially severe machinery operations. The knowledge and reliable description of the input vibration source is a key step, similarly to a reliable description of the structural system, to verify. However, such a kind of detailing is often unavailable and results in a series of simplified calculation assumptions. In this paper, a case-study eyewear factory built in 2019 is investigated. Its layout takes the form of a two-story, two-span (2 × 14.6 m) precast concrete frame (poor customer/designer communication on the final equipment resulted in various non-isolated computer numerical control (CNC) vertical machines mounted on the inter-story floor, that started to suffer from pronounced resonance issues. Following past experience, this paper investigates the validity of a coupled experimental–numerical method that could be used for efficient assessment predictive studies. Based on on-site experiments with Micro Electro-Mechanical Systems (MEMS) accelerometers mounted on the floor and on the machine (spindle included), the most unfavorable machine-induced vibration sources and operational conditions are first characterized. The experimental outcomes are thus used to derive a synthetized signal that is integrated in efficient one-bay finite element (FE) numerical model of the floor, in which the machine–structure interaction can be taken into account. The predictability of marked resonance issues is thus emphasized, with a focus on potential and possible limits of FE methods characterized by an increasing level of detailing and computational cost.

ACS Style

Enrico Bergamo; Marco Fasan; Chiara Bedon. Efficiency of Coupled Experimental–Numerical Predictive Analyses for Inter-Story Floors Under Non-Isolated Machine-Induced Vibrations. Actuators 2020, 9, 87 .

AMA Style

Enrico Bergamo, Marco Fasan, Chiara Bedon. Efficiency of Coupled Experimental–Numerical Predictive Analyses for Inter-Story Floors Under Non-Isolated Machine-Induced Vibrations. Actuators. 2020; 9 (3):87.

Chicago/Turabian Style

Enrico Bergamo; Marco Fasan; Chiara Bedon. 2020. "Efficiency of Coupled Experimental–Numerical Predictive Analyses for Inter-Story Floors Under Non-Isolated Machine-Induced Vibrations." Actuators 9, no. 3: 87.

Correction
Published: 04 February 2020 in Applied Sciences
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We, the authors, wish to make the following corrections to our paper

ACS Style

Chiara Bedon; Marco Fasan. Correction: Bedon, C.; Fasan, M. Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway. Appl. Sci. 2019, 9, 1936. Applied Sciences 2020, 10, 1032 .

AMA Style

Chiara Bedon, Marco Fasan. Correction: Bedon, C.; Fasan, M. Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway. Appl. Sci. 2019, 9, 1936. Applied Sciences. 2020; 10 (3):1032.

Chicago/Turabian Style

Chiara Bedon; Marco Fasan. 2020. "Correction: Bedon, C.; Fasan, M. Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway. Appl. Sci. 2019, 9, 1936." Applied Sciences 10, no. 3: 1032.

Journal article
Published: 11 May 2019 in Applied Sciences
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The vibration performance of pedestrian structures attracts the attention of several studies, especially with respect to unfavorable operational conditions or possible damage scenarios. Given a pedestrian system, specific vibration comfort levels must be satisfied in addition to basic safety requirements, depending on the class of use, the structural typology and the materials. To this aim, guideline documents of the literature offer simplified single-degree-of-freedom (SDOF) approaches to estimate the maximum expected vibrations and to verify the required comfort limits. Most of these documents, however, are specifically calibrated for specific scenarios/structural typologies. Dedicated methods of design and analysis, in this regard, may be required for structural glass pedestrian systems, due to their intrinsic features (small thickness-to-size ratios, high flexibility, type and number of supports, live-to-dead load ratios, use of materials that are susceptible to mechanical degradation with time/temperature/humidity, etc.). Careful consideration could be then needed not only at the design stage, but also during the service life of a given glass walkway. In this paper, the dynamic performance of an in-service glass walkway is taken into account and explored via field vibration experiments. A set of walking configurations of technical interest is considered, involving 20 volunteers and several movement features. The vibration comfort of the structure is then assessed based on experimental estimates and existing guideline documents. The intrinsic uncertainties and limits of simplified approaches of literature are discussed, with respect to the performance of the examined glass walkway. In conclusion, the test predictions are also used to derive “perception index” data and scales that could support a reliable vibration comfort assessment of in-service pedestrian glass structures.

ACS Style

Chiara Bedon; Marco Fasan. Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway. Applied Sciences 2019, 9, 1936 .

AMA Style

Chiara Bedon, Marco Fasan. Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway. Applied Sciences. 2019; 9 (9):1936.

Chicago/Turabian Style

Chiara Bedon; Marco Fasan. 2019. "Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway." Applied Sciences 9, no. 9: 1936.

Journal article
Published: 02 February 2019 in Engineering Structures
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The seismic behaviour of masonry structures is, as well-known, strongly influenced by axial stresses. During a seismic event, variations in axial loading cause in fact a change, that can be substantial, in the response in the lateral resistance capacity of masonry panels. Moreover, the axial stress can be modified by the vertical component of the seismic input during an event, which can amplify the strength variations, in particular if there is a near-fault excitation. In general, such vertical component is neglected in a traditional design. In this work, the influence of the vertical component of a seismic event is evaluated by measuring the lateral resistance of masonry piers. Such influence is estimated through a cyclic phenomenological model which calculates in an analytical way the lateral strength of a masonry panel on the base of the actual axial loading, reached step-by-step during a non-linear analysis. This model is used to simulate the cyclic behaviour of an unreinforced masonry façade made of 3 piers, having the same section for 2 floors and connected by rigid spandrels. The wall, representative of a typical masonry façade, is subjected to a series of earthquake records, with and without the vertical component of the seismic input. The differences in the responses are quantified through the use of seismic reduction factors, in such a way to satisfy the checking of the piers adopting the current design codes.

ACS Style

Giovanni Rinaldin; Marco Fasan; Salvatore Noé; Claudio Amadio. The influence of earthquake vertical component on the seismic response of masonry structures. Engineering Structures 2019, 185, 184 -193.

AMA Style

Giovanni Rinaldin, Marco Fasan, Salvatore Noé, Claudio Amadio. The influence of earthquake vertical component on the seismic response of masonry structures. Engineering Structures. 2019; 185 ():184-193.

Chicago/Turabian Style

Giovanni Rinaldin; Marco Fasan; Salvatore Noé; Claudio Amadio. 2019. "The influence of earthquake vertical component on the seismic response of masonry structures." Engineering Structures 185, no. : 184-193.

Journal article
Published: 05 January 2019 in Buildings
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Given a series of intrinsic features of structural glass systems (i.e., material properties, type of restraints, operational conditions, etc.), special care should be spent at the design stage, to ensure appropriate fail-safe requirements, but also in the service life of these innovative building components and assemblies. In this paper, the dynamic characterization of simple monolithic glass elements is presented, based on non-destructive laboratory experiments and Operational Modal Analysis (OMA) techniques, including Finite Element (FE) numerical simulations, classical analytical models, and video-tracking approaches. It is shown, in particular, how the actual restraint condition (i.e., flexibility of supports, with respect to ideal boundaries) can affect the vibration parameters of a given glass member (frequency and damping capacity). This turns out in possible variations of its overall structural performance, including stress-strain-related effects, hence suggesting the need for even further dedicated studies and methods for the reliable analysis and design of structural glass assemblies and complex systems under dynamic loads.

ACS Style

Chiara Bedon; Marco Fasan; Claudio Amadio. Vibration Analysis and Dynamic Characterization of Structural Glass Elements with Different Restraints Based on Operational Modal Analysis. Buildings 2019, 9, 13 .

AMA Style

Chiara Bedon, Marco Fasan, Claudio Amadio. Vibration Analysis and Dynamic Characterization of Structural Glass Elements with Different Restraints Based on Operational Modal Analysis. Buildings. 2019; 9 (1):13.

Chicago/Turabian Style

Chiara Bedon; Marco Fasan; Claudio Amadio. 2019. "Vibration Analysis and Dynamic Characterization of Structural Glass Elements with Different Restraints Based on Operational Modal Analysis." Buildings 9, no. 1: 13.

Journal article
Published: 01 December 2017 in Journal of Constructional Steel Research
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In current design practice for seismic resistant steel braced frames, general rules and standard provisions are\ud aimed to ensure a structural behaviour for beam-to-column joints of non-braced spans as close as possible to\ud perfect hinges. This is done to prevent any kind of interaction with the bracing systems, in particular under\ud horizontal loads. However, the global performance of composite joints is markedly affected by the structural\ud interaction between the concrete slab and the steel components and - especially during seismic events - struts\ud can occur in the slab at the beam-to-column intersection.\ud In this paper, the possibility of realizing a composite joint that behaves as moment-resisting under gravitational\ud loads and essentially as hinged under horizontal loads is investigated. Aiming to assess the actual slab-interaction\ud effects on the overall response, a full 3D Finite Element (FE) model representative of a beam-to-column composite\ud joint taking part of a braced frame is described in ABAQUS and validated towards past full-scale experiments.\ud A parametric study is hence proposed, by accounting for three geometrical configurations, being characterized by\ud (i) isolated slab with absence of rebar continuity (i.e. fully disconnected slab and steel joint only), (ii) presence of\ud slab with partial column interaction (i.e. isolated slab and continuity of rebar), (iii) presence of fully interacting\ud slab. It is shown that, if properly detailed, a joint with isolated slab and continuous rebars can be used in nonbraced\ud spans of composite braced frames without affecting the behaviour of the bracing system (i.e. as in\ud presence of a hinge). Nonetheless, the composite beam can be designed as continuous on multiple supports\ud under vertical loads, hence leading to a reduction of the steel cross-sectional size

ACS Style

Claudio Amadio; Chiara Bedon; Marco Fasan. Numerical assessment of slab-interaction effects on the behaviour of steel-concrete composite joints. Journal of Constructional Steel Research 2017, 139, 397 -410.

AMA Style

Claudio Amadio, Chiara Bedon, Marco Fasan. Numerical assessment of slab-interaction effects on the behaviour of steel-concrete composite joints. Journal of Constructional Steel Research. 2017; 139 ():397-410.

Chicago/Turabian Style

Claudio Amadio; Chiara Bedon; Marco Fasan. 2017. "Numerical assessment of slab-interaction effects on the behaviour of steel-concrete composite joints." Journal of Constructional Steel Research 139, no. : 397-410.

Journal article
Published: 01 May 2017 in Engineering Structures
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This paper proposes a refined Finite-Element (FE) numerical approach to predict both global and local behaviour of steel-concrete composite welded joints subjected to seismic loads. The reference FE model is implemented in ABAQUS and first extensively validated to the full-scale experimental results of a welded steel-concrete composite specimen tested in a past research project, where the beam-to-column sub-assemblages were designed according to the prescriptions of Eurocode 4 and Eurocode 8. As shown, due to the FE modelling assumptions, a rather close agreement was generally found between the FE predictions and the corresponding test measurements, both in terms of global and local phenomena. Therefore, it is first expected that such numerical approach could be implemented as an alternative to costly and time consuming full-scale experimental tests, allowing an extensive parametric investigation of composite joints and possible design optimizations. An implicit advantage of the implemented FE model, in fact, is that according to a refined analysis of the experimental and numerical results for the welded joint object of investigation, the efficiency of the Eurocode 8 design prescriptions for steel-concrete composite joint details can be critically discussed and reviewed. In the specific case, a possible improvement of the design recommendations for the slab reinforcement around the column is proposed

ACS Style

Claudio Amadio; Chiara Bedon; Marco Fasan; Maria Rosa Pecce. Refined numerical modelling for the structural assessment of steel-concrete composite beam-to-column joints under seismic loads. Engineering Structures 2017, 138, 394 -409.

AMA Style

Claudio Amadio, Chiara Bedon, Marco Fasan, Maria Rosa Pecce. Refined numerical modelling for the structural assessment of steel-concrete composite beam-to-column joints under seismic loads. Engineering Structures. 2017; 138 ():394-409.

Chicago/Turabian Style

Claudio Amadio; Chiara Bedon; Marco Fasan; Maria Rosa Pecce. 2017. "Refined numerical modelling for the structural assessment of steel-concrete composite beam-to-column joints under seismic loads." Engineering Structures 138, no. : 394-409.