Stefano Lenci | Università Politecnica delle Marche, Italy (original) (raw)

Papers by Stefano Lenci

Research paper thumbnail of Preliminary study of the influence of different modelling choices and materials properties uncertainties on the seismic assessment of an existing RC school building

INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016), 2017

This paper studies the influence of some aleatory and epistemic uncertainties on the seismic beha... more This paper studies the influence of some aleatory and epistemic uncertainties on the seismic behaviour of an existing RC school building through a codified sensitivity analysis that uses pushover analyses and a logic tree approach. The considered epistemic uncertainties, i.e. diaphragm stiffness and modelling of stairs, seem not influencing the final assessment in term of index of seismic risk. Vice versa, aleatory ones, i.e. concrete and steel mechanical properties, strongly affect the Index. For this reason, investigations and tests should focus on the study of the mechanical properties, and, in particular, on the study of columns’ concrete mechanical properties, which have the largest impact on the building seismic response.

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Research paper thumbnail of Numerical model upgrading of a historical masonry palace monitored with a wireless sensor network

International journal of masonry research and innovation, 2016

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Research paper thumbnail of Cultural Heritage and Earthquake: The Case Study of “Santa Maria Della Carità” in Ascoli Piceno

The Open Civil Engineering Journal, Dec 29, 2017

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Research paper thumbnail of Vibration-Based SHM of Ordinary Buildings: Detection and Quantification of Structural Damage

One of the most important issues in civil and in mechanical engineering is the detection of struc... more One of the most important issues in civil and in mechanical engineering is the detection of structural damages, which are defined as changes of material properties, of boundary conditions and of system connectivity, which adversely affect the system’s performances. The damage identification process generally requires establishing existence, localization, type and intensity of the damage.During its service life, a structure, besides his natural aging, can be subjected to earthquakes. These events may have a deep impact on building safety and a continuous monitoring of the structure health conditions, through Structural Health Monitoring (SHM) techniques, is necessary in many cases.Within this a background, the purpose of this work is to propose an integrated novel approach for the diagnosis of structures after a seismic event. The proposed monitoring system is based on recording the accelerations of the real structure during a seismic input, and the reintroduction of them into a numerical model, suitably tuned, in order to outline a possible post-earthquake scenario.This approach provides an estimation of the health of the building and of its residual life, and to detect and quantify the damage, some of the crucial aspects of SHM. Actually, we also get both online and self-diagnosis of the structural health.The technique is applied to a real structure, an industrial building liable of some seismic vulnerabilities. It it did not undergo an earthquake, so we have not recordered accelerations, and get them from a different numerical models subjected to the ground acceleration of a realistic earthquake.Copyright © 2015 by ASME

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Research paper thumbnail of Proof of concept of the structural health monitoring of framed structures by a novel combined experimental and theoretical approach

Structural control & health monitoring, Nov 2, 2015

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Research paper thumbnail of Dry Masonry Strenghtening through Basalt Fibre Ropes: Experimental Results against Out-of-Plane Actions

Key Engineering Materials, Sep 1, 2014

One of the most important characteristics that historical masonry should have is that of a monoli... more One of the most important characteristics that historical masonry should have is that of a monolithic behavior. Without these basic feature, no structural analysis could be considered reliable. If this characteristic is absent, strengthening bearing masonry giving it a transversal monolithic behavior is one of the first retrofitting actions to do so as to improve its seismic performance. Hence come out the idea to develop a new consolidation technique specially formulated for historical masonry. Stitching masonry through continuous flexible elements is an innovative technique, able to connect the several masonry components and to attribute to it a monolithic behavior according to the principles that govern the intervention on existing buildings: minimal intervention, compatibility, reversibility, respect of authenticity, matter conservation, control of the visual impact and possibility of recognizing the intervention. Basalt fibers ropes of 4 mm of nominal diameter (declared by manufacturer), have been used in this experimental program as continuous flexible element. The technique has been already tested and proved to be effective for improving the behavior against “in-plane” actions. Good results has been obtained also excluding synthetic adhesives (resins), with an enhancement about reversibility. In this paper, the results of an experimental campaign aimed to evaluate the technique effectiveness against “out-of-plane” loads are presented. Reinforced and unreinforced brick masonry specimens have been tested simulating vertical bending mechanism activation to evaluate the stitches contribute.

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Research paper thumbnail of Damage detection in a precast structure subjected to an earthquake: A numerical approach

Engineering Structures, Nov 1, 2016

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Research paper thumbnail of Global Analysis of Stochastic Nonlinear Dynamical Systems. Part 2: Influence of Uncertainties and Noise on Basins/Attractors Topology and Integrity

This paper explores the influence of uncertainties and noise on the global dynamics of nonlinear ... more This paper explores the influence of uncertainties and noise on the global dynamics of nonlinear systems, with emphasis on the basins and attractors’ topology and on the dynamic integrity of coexisting solutions. For this, the adaptive phase-space discretization strategy proposed in Part I [1] is employed. Two well-known archetypal oscillators found in engineering applications, the Helmholtz and Duffing oscillators under harmonic or parametric excitation with uncertain parameters or added load noise, are studied. The results demonstrate the adaptive capability of the proposed method, increasing the resolution without increasing the computational cost. Mean basins of attraction and attractors’ distributions are obtained. The time-dependency of stochastic responses is demonstrated, with long-transients influencing the short-term behavior. Finally, the effect of uncertainties and noise on the basins areas, attractors distributions and basin boundaries is discussed, which can be used to...

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Research paper thumbnail of Global Analysis of Stochastic Nonlinear Dynamical Systems. Part 1: Adaptative Phase-Space Discretization Strategy

An adaptative phase-space discretization strategy for the global analysis of stochastic nonlinear... more An adaptative phase-space discretization strategy for the global analysis of stochastic nonlinear dynamical systems with competing attractors considering parameter uncertainty or noise is proposed. The strategy is based on the classical Ulam method. The appropriate transfer operators for a given dynamical system are derived and applied to obtain and refine the basins of attraction boundaries and attractors distributions and densities. A review of the main concepts of parameter uncertainty and stochasticity from a global dynamics perspective is given, and the necessary modifications to the Ulam method are addressed. The stochastic basin of attraction definition here used replaces the usual basin concept. It quantifies the probability of the response associated with a given set of initial conditions converging to a particular attractor. The phase-space dimension is augmented to include the extra dimensions associated with the parameter space for the case of parameter uncertainty, bein...

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Research paper thumbnail of The Non-Smooth Story of Different Masonry Towers Damaged by the Central Italy Seismic Sequence of 2016

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2019

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Research paper thumbnail of Sustainable Engineering for Resilient Built and Natural Environments

The First Outstanding 50 Years of “Università Politecnica delle Marche”, 2019

We discuss the research that is being carried out at the Department of Civil and Building Enginee... more We discuss the research that is being carried out at the Department of Civil and Building Engineering and Architecture (Dipartimento di Ingegneria Civile, Edile e Architettura, DICEA) of the Universita Politecnica delle Marche (UNIVPM). Over the years the DICEA has steadily focused its attention on resilient environments and buildings, making a growing know-how and skill available to the local and broad communities. Pivotal to this have been dedicated projects and funds, like the UNIVPM strategic projects and the MIUR Dipartimenti di Eccellenza award. In conjunction with the four companion papers, produced by researchers of the four divisions of DICEA, we illustrate the DICEA’s trajectory in the analysis of sustainable engineering for resilient built and natural environments.

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Research paper thumbnail of Continuous and Discontinuous Descriptions of Blocked Structures: The Case Study of Santissimo Crocifisso Churches in Pretare (Italy)

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2021

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Research paper thumbnail of Discontinuous approaches for nonlinear dynamic analyses of an ancient masonry tower

Engineering Structures, 2021

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Research paper thumbnail of 1:1 Internal Resonance in a Two D.O.F. Complete System: A Comprehensive Analysis and Its Possible Exploitation for Design

Meccanica, 2020

The internal resonance of a two degree-of-freedom mechanical system with all typical (quadratic a... more The internal resonance of a two degree-of-freedom mechanical system with all typical (quadratic and cubic) geometric nonlinearities is studied, limiting to the case of free dynamics. The Multiple Time Scale method is used to provide an analytical, closed form, approximation of the backbone curves. The cornucopia of different possible behaviours that can been obtained by varying the nonlinear stiffnesses is discussed in depth, illustrating them with some examples and verifying with numerical simulations. Some partially unexpected or relevant behaviours are highlighted, and some hints on how to exploit the proposed results to design nonlinearly tailored systems are given.

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Research paper thumbnail of Influence of FE Modelling Approaches on Vulnerabilities of RC School Buildings and Proposal of a CFRP Retrofitting Intervention

The Open Construction and Building Technology Journal, 2019

Background: The vulnerability assessment of existing school buildings against earthquakes represe... more Background: The vulnerability assessment of existing school buildings against earthquakes represents a priority concern for society. In recent years, several countries promote seismic rehabilitation projects of school buildings, including the allocation of funds to regions with high seismic hazard. Objective: This research aims to highlight some key role aspects related to difficulties encountered in the numerical modelling of RC structures hosting school activities. This work evaluates the seismic vulnerability of school buildings located in the municipality of Trecastelli (Marche, Central Italy) to quantify the effective influence of typical and specific seismic vulnerabilities detected on the global seismic behaviour of each building. The effectiveness of a possible Carbon Fibre Reinforced Polymer (CFRP) local strengthening intervention, for the case study, aimed to confine unconfined beam-column joints is also considered. Methods: Three different numerical models of a Reinforced...

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Research paper thumbnail of Damage assessment of ancient masonry churches stroked by the Central Italy earthquakes of 2016 by the non-smooth contact dynamics method

Bulletin of Earthquake Engineering, 2019

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Research paper thumbnail of Cross-checking asymptotics and numerics in the hardening/softening behaviour of Timoshenko beams with axial end spring and variable slenderness

Archive of Applied Mechanics, 2016

Two approximate solutions for the nonlinear free oscillations of a planar Timoshenko beam are com... more Two approximate solutions for the nonlinear free oscillations of a planar Timoshenko beam are compared to each other. The beam has an axial spring that permits to consider different boundary conditions, from axially free (which has a softening nonlinear behaviour) to perfectly axially restrained (which has a hardening nonlinear behaviour). The first approximation is analytical and is obtained by the asymptotic development method, while the second is numerical and is obtained by the finite element method. The comparison is made in terms of backbone curves describing the dependence of the (nonlinear) frequency on the oscillation amplitude. Very good agreement is found, for both slender and thick beams, and for varying stiffness of the end spring. This is a cross-check verification of the reliability of both approximate solutions.

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Research paper thumbnail of A comprehensive analysis of hardening/softening behaviour of shearable planar beams with whatever axial boundary constraint

Meccanica, 2016

The free nonlinear oscillations of a planar elastic beam are investigated based on a comprehensiv... more The free nonlinear oscillations of a planar elastic beam are investigated based on a comprehensive asymptotic treatment of the exact equations of motion. With the aim of investigating the behaviour also for low slenderness, shear deformations and rotational inertia are taken into account. Attention is payed to the influence of the geometrical and mechanical parameters, and of the boundary conditions in changing the nonlinear behaviour from softening to hardening. An axial linear spring is added to one end of the beam, and it is shown how the behaviour changes qualitatively on passing from the hinged-hinged (commonly hardening) to the hinged-supported (commonly softening) case. Some interesting, and partially unexpected, results are obtained also for values of the slenderness moderately low but still in the realm of practical applications.

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Research paper thumbnail of Seamless variation of isometric and anisometric dynamical integrity measures in basins’s erosion

Communications in Nonlinear Science and Numerical Simulation, 2018

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Research paper thumbnail of Reply to the Discussion on ‘A comprehensive analysis of hardening/softening behavior of shearable planar beams with whatever axial boundary constraint’, by D. Genovese

Meccanica, 2017

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Research paper thumbnail of Preliminary study of the influence of different modelling choices and materials properties uncertainties on the seismic assessment of an existing RC school building

INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016), 2017

This paper studies the influence of some aleatory and epistemic uncertainties on the seismic beha... more This paper studies the influence of some aleatory and epistemic uncertainties on the seismic behaviour of an existing RC school building through a codified sensitivity analysis that uses pushover analyses and a logic tree approach. The considered epistemic uncertainties, i.e. diaphragm stiffness and modelling of stairs, seem not influencing the final assessment in term of index of seismic risk. Vice versa, aleatory ones, i.e. concrete and steel mechanical properties, strongly affect the Index. For this reason, investigations and tests should focus on the study of the mechanical properties, and, in particular, on the study of columns’ concrete mechanical properties, which have the largest impact on the building seismic response.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Numerical model upgrading of a historical masonry palace monitored with a wireless sensor network

International journal of masonry research and innovation, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Cultural Heritage and Earthquake: The Case Study of “Santa Maria Della Carità” in Ascoli Piceno

The Open Civil Engineering Journal, Dec 29, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Vibration-Based SHM of Ordinary Buildings: Detection and Quantification of Structural Damage

One of the most important issues in civil and in mechanical engineering is the detection of struc... more One of the most important issues in civil and in mechanical engineering is the detection of structural damages, which are defined as changes of material properties, of boundary conditions and of system connectivity, which adversely affect the system’s performances. The damage identification process generally requires establishing existence, localization, type and intensity of the damage.During its service life, a structure, besides his natural aging, can be subjected to earthquakes. These events may have a deep impact on building safety and a continuous monitoring of the structure health conditions, through Structural Health Monitoring (SHM) techniques, is necessary in many cases.Within this a background, the purpose of this work is to propose an integrated novel approach for the diagnosis of structures after a seismic event. The proposed monitoring system is based on recording the accelerations of the real structure during a seismic input, and the reintroduction of them into a numerical model, suitably tuned, in order to outline a possible post-earthquake scenario.This approach provides an estimation of the health of the building and of its residual life, and to detect and quantify the damage, some of the crucial aspects of SHM. Actually, we also get both online and self-diagnosis of the structural health.The technique is applied to a real structure, an industrial building liable of some seismic vulnerabilities. It it did not undergo an earthquake, so we have not recordered accelerations, and get them from a different numerical models subjected to the ground acceleration of a realistic earthquake.Copyright © 2015 by ASME

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Research paper thumbnail of Proof of concept of the structural health monitoring of framed structures by a novel combined experimental and theoretical approach

Structural control & health monitoring, Nov 2, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dry Masonry Strenghtening through Basalt Fibre Ropes: Experimental Results against Out-of-Plane Actions

Key Engineering Materials, Sep 1, 2014

One of the most important characteristics that historical masonry should have is that of a monoli... more One of the most important characteristics that historical masonry should have is that of a monolithic behavior. Without these basic feature, no structural analysis could be considered reliable. If this characteristic is absent, strengthening bearing masonry giving it a transversal monolithic behavior is one of the first retrofitting actions to do so as to improve its seismic performance. Hence come out the idea to develop a new consolidation technique specially formulated for historical masonry. Stitching masonry through continuous flexible elements is an innovative technique, able to connect the several masonry components and to attribute to it a monolithic behavior according to the principles that govern the intervention on existing buildings: minimal intervention, compatibility, reversibility, respect of authenticity, matter conservation, control of the visual impact and possibility of recognizing the intervention. Basalt fibers ropes of 4 mm of nominal diameter (declared by manufacturer), have been used in this experimental program as continuous flexible element. The technique has been already tested and proved to be effective for improving the behavior against “in-plane” actions. Good results has been obtained also excluding synthetic adhesives (resins), with an enhancement about reversibility. In this paper, the results of an experimental campaign aimed to evaluate the technique effectiveness against “out-of-plane” loads are presented. Reinforced and unreinforced brick masonry specimens have been tested simulating vertical bending mechanism activation to evaluate the stitches contribute.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Damage detection in a precast structure subjected to an earthquake: A numerical approach

Engineering Structures, Nov 1, 2016

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Research paper thumbnail of Global Analysis of Stochastic Nonlinear Dynamical Systems. Part 2: Influence of Uncertainties and Noise on Basins/Attractors Topology and Integrity

This paper explores the influence of uncertainties and noise on the global dynamics of nonlinear ... more This paper explores the influence of uncertainties and noise on the global dynamics of nonlinear systems, with emphasis on the basins and attractors’ topology and on the dynamic integrity of coexisting solutions. For this, the adaptive phase-space discretization strategy proposed in Part I [1] is employed. Two well-known archetypal oscillators found in engineering applications, the Helmholtz and Duffing oscillators under harmonic or parametric excitation with uncertain parameters or added load noise, are studied. The results demonstrate the adaptive capability of the proposed method, increasing the resolution without increasing the computational cost. Mean basins of attraction and attractors’ distributions are obtained. The time-dependency of stochastic responses is demonstrated, with long-transients influencing the short-term behavior. Finally, the effect of uncertainties and noise on the basins areas, attractors distributions and basin boundaries is discussed, which can be used to...

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Research paper thumbnail of Global Analysis of Stochastic Nonlinear Dynamical Systems. Part 1: Adaptative Phase-Space Discretization Strategy

An adaptative phase-space discretization strategy for the global analysis of stochastic nonlinear... more An adaptative phase-space discretization strategy for the global analysis of stochastic nonlinear dynamical systems with competing attractors considering parameter uncertainty or noise is proposed. The strategy is based on the classical Ulam method. The appropriate transfer operators for a given dynamical system are derived and applied to obtain and refine the basins of attraction boundaries and attractors distributions and densities. A review of the main concepts of parameter uncertainty and stochasticity from a global dynamics perspective is given, and the necessary modifications to the Ulam method are addressed. The stochastic basin of attraction definition here used replaces the usual basin concept. It quantifies the probability of the response associated with a given set of initial conditions converging to a particular attractor. The phase-space dimension is augmented to include the extra dimensions associated with the parameter space for the case of parameter uncertainty, bein...

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Research paper thumbnail of The Non-Smooth Story of Different Masonry Towers Damaged by the Central Italy Seismic Sequence of 2016

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sustainable Engineering for Resilient Built and Natural Environments

The First Outstanding 50 Years of “Università Politecnica delle Marche”, 2019

We discuss the research that is being carried out at the Department of Civil and Building Enginee... more We discuss the research that is being carried out at the Department of Civil and Building Engineering and Architecture (Dipartimento di Ingegneria Civile, Edile e Architettura, DICEA) of the Universita Politecnica delle Marche (UNIVPM). Over the years the DICEA has steadily focused its attention on resilient environments and buildings, making a growing know-how and skill available to the local and broad communities. Pivotal to this have been dedicated projects and funds, like the UNIVPM strategic projects and the MIUR Dipartimenti di Eccellenza award. In conjunction with the four companion papers, produced by researchers of the four divisions of DICEA, we illustrate the DICEA’s trajectory in the analysis of sustainable engineering for resilient built and natural environments.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Continuous and Discontinuous Descriptions of Blocked Structures: The Case Study of Santissimo Crocifisso Churches in Pretare (Italy)

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2021

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Discontinuous approaches for nonlinear dynamic analyses of an ancient masonry tower

Engineering Structures, 2021

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 1:1 Internal Resonance in a Two D.O.F. Complete System: A Comprehensive Analysis and Its Possible Exploitation for Design

Meccanica, 2020

The internal resonance of a two degree-of-freedom mechanical system with all typical (quadratic a... more The internal resonance of a two degree-of-freedom mechanical system with all typical (quadratic and cubic) geometric nonlinearities is studied, limiting to the case of free dynamics. The Multiple Time Scale method is used to provide an analytical, closed form, approximation of the backbone curves. The cornucopia of different possible behaviours that can been obtained by varying the nonlinear stiffnesses is discussed in depth, illustrating them with some examples and verifying with numerical simulations. Some partially unexpected or relevant behaviours are highlighted, and some hints on how to exploit the proposed results to design nonlinearly tailored systems are given.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of FE Modelling Approaches on Vulnerabilities of RC School Buildings and Proposal of a CFRP Retrofitting Intervention

The Open Construction and Building Technology Journal, 2019

Background: The vulnerability assessment of existing school buildings against earthquakes represe... more Background: The vulnerability assessment of existing school buildings against earthquakes represents a priority concern for society. In recent years, several countries promote seismic rehabilitation projects of school buildings, including the allocation of funds to regions with high seismic hazard. Objective: This research aims to highlight some key role aspects related to difficulties encountered in the numerical modelling of RC structures hosting school activities. This work evaluates the seismic vulnerability of school buildings located in the municipality of Trecastelli (Marche, Central Italy) to quantify the effective influence of typical and specific seismic vulnerabilities detected on the global seismic behaviour of each building. The effectiveness of a possible Carbon Fibre Reinforced Polymer (CFRP) local strengthening intervention, for the case study, aimed to confine unconfined beam-column joints is also considered. Methods: Three different numerical models of a Reinforced...

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Research paper thumbnail of Damage assessment of ancient masonry churches stroked by the Central Italy earthquakes of 2016 by the non-smooth contact dynamics method

Bulletin of Earthquake Engineering, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Cross-checking asymptotics and numerics in the hardening/softening behaviour of Timoshenko beams with axial end spring and variable slenderness

Archive of Applied Mechanics, 2016

Two approximate solutions for the nonlinear free oscillations of a planar Timoshenko beam are com... more Two approximate solutions for the nonlinear free oscillations of a planar Timoshenko beam are compared to each other. The beam has an axial spring that permits to consider different boundary conditions, from axially free (which has a softening nonlinear behaviour) to perfectly axially restrained (which has a hardening nonlinear behaviour). The first approximation is analytical and is obtained by the asymptotic development method, while the second is numerical and is obtained by the finite element method. The comparison is made in terms of backbone curves describing the dependence of the (nonlinear) frequency on the oscillation amplitude. Very good agreement is found, for both slender and thick beams, and for varying stiffness of the end spring. This is a cross-check verification of the reliability of both approximate solutions.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A comprehensive analysis of hardening/softening behaviour of shearable planar beams with whatever axial boundary constraint

Meccanica, 2016

The free nonlinear oscillations of a planar elastic beam are investigated based on a comprehensiv... more The free nonlinear oscillations of a planar elastic beam are investigated based on a comprehensive asymptotic treatment of the exact equations of motion. With the aim of investigating the behaviour also for low slenderness, shear deformations and rotational inertia are taken into account. Attention is payed to the influence of the geometrical and mechanical parameters, and of the boundary conditions in changing the nonlinear behaviour from softening to hardening. An axial linear spring is added to one end of the beam, and it is shown how the behaviour changes qualitatively on passing from the hinged-hinged (commonly hardening) to the hinged-supported (commonly softening) case. Some interesting, and partially unexpected, results are obtained also for values of the slenderness moderately low but still in the realm of practical applications.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Seamless variation of isometric and anisometric dynamical integrity measures in basins’s erosion

Communications in Nonlinear Science and Numerical Simulation, 2018

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Reply to the Discussion on ‘A comprehensive analysis of hardening/softening behavior of shearable planar beams with whatever axial boundary constraint’, by D. Genovese

Meccanica, 2017

Bookmarks Related papers MentionsView impact