Nicolò Vaiana

Nicolò Vaiana
University of Naples Federico II | UNINA · Department of Structures for Engineering and Architecture

Research Fellow in Structural Mechanics and Dynamics

About

48
Publications
6,854
Reads
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506
Citations
Introduction
Fields of Interest: nonlinear dynamics: hysteretic mechanical systems, seismically base-isolated structures; computational techniques: numerical time integration methods; nonlinear models: rate-(in)dependent hysteretic models; experimental dynamics: experimental validation of nonlinear models; hysteretic devices: elastomeric and sliding seismic isolators, wire rope isolators; matlab codes for education and research.
Additional affiliations
October 2017 - present
University of Naples Federico II
Position
  • PostDoc Position
Description
  • Nonlinear Dynamics. Advisor: Prof. L Rosati
September 2017 - present
University of Naples Federico II
Position
  • Teaching Assistant | SSD 08/B2
Description
  • Scienza delle Costruzioni, Analisi Strutturale con gli Elementi Finiti, FEM in Nonlinear Structural Analysis
August 2015 - May 2016
University of California, Berkeley
Position
  • Researcher
Description
  • Simulation of the Seismic Response of Base-Isolated Structures. Advisor: Prof. FC Filippou
Education
March 2014 - February 2017
University of Naples Federico II
Field of study
  • Structural, Geotechnical and Seismic Engineering
September 2013 - January 2015
University of Naples Federico II
Field of study
  • Emerging Technologies for Construction (ETeC)
September 2007 - May 2013
University of Calabria
Field of study
  • Building Engineering and Architecture

Publications

Publications (48)
Poster
Full-text available
International short course at California State University, Long Beach (US) Instructors: D Losanno and N Vaiana
Chapter
The fulfillment of the Drucker postulate applied to a phenomenological hysteretic constitutive model is hereby investigated. Such a material is defined in terms of analytical functions so that it is capable of determining the response and its tangent operator in closed form and does not require any iterative algorithm. Hence, the constitutive model...
Article
Full-text available
This paper investigates the rocking behavior of rigid bodies seismically protected by means of lead rubber bearings and high damping rubber bearings, which are the most popular kinds of elastomeric isolators in the market. The complex nonlinear force–displacement relationship displayed by such devices is predicted by a phenomenological model based...
Presentation
Full-text available
We are very happy to announce that we will have 𝗱𝗿. 𝗦𝗶𝗹𝘃𝗶𝗮 𝗠𝗮𝘇𝘇𝗼𝗻𝗶 as invited speaker for a short lecture entitled “𝙃𝙮𝙨𝙩𝙚𝙧𝙚𝙩𝙞𝙘 𝙈𝙤𝙙𝙚𝙡𝙨 𝙞𝙣 𝙊𝙥𝙚𝙣𝙎𝙚𝙚𝙨”. Dr. Silvia Mazzoni has been training OpenSees users for over 20 years. She developed the first OpenSees Days workshops held at the University of California at Berkeley as part of the OpenSees Developme...
Article
Full-text available
The dynamic response and bifurcations of high-dimensional systems endowed with hysteretic restoring forces in all degrees of freedom are investigated. Two types of hysteresis models are considered, namely the Bouc–Wen model and a differential version of the so-called exponential model of hysteresis. The numerical technique tailored for tackling hig...
Article
This paper presents a novel family of multiple springs models capable of reproducing the nonlinear response typical of mechanical systems and materials having a biaxial kinematic rate-independent hysteretic behavior. In such a formulation, the generalized force vector, representing the output variable, is computed by summing the contribution of n s...
Article
The paper addresses the theoretical framework and the numerical procedure developed to carry out the sectional analysis preliminary to the use of a recently formulated isotropic and homogeneous beam model consistently derived from the Saint Venant solid one. Specifically, in order to ensure the equivalence of the new beam model with the 3D solid on...
Article
Full-text available
The complex response characterizing elastomeric isolation bearings is reproduced by employing a novel uniaxial hysteretic model that has been recently formulated and successfully implemented in OpenSees. Such a novel OpenSees material model offers several advantages with respect to differential models typically available in commercial software prod...
Article
The use of elastomeric bearings for base isolation is well established through several studies. This paper is mainly focused on an innovative Fiber-Reinforced Bearing (FRB) developed using recycled rubber (RR-FRBs) and glass fabric reinforcement. These bearings tend to have better dissipation capacity, low weight and reduced cost in comparison with...
Article
We extend a recently developed class of uniaxial symmetric rate-independent models to simulate complex asymmetric mechanical hysteresis phenomena. The main features of the novel formulation, that allows for the evaluation of the generalized force by solving a scalar equation and employing only one history variable, are illustrated by developing two...
Chapter
A two-step form-finding strategy for determining the heights of a shell of a given plan-form is presented. The shell heights are determined in such a way that the structure can equilibrate applied loads by pure membrane actions. To this end, a set of algebraic equations are obtained by applying the finite difference method to the differential equat...
Conference Paper
Full-text available
In this work we investigate the rocking response of the Riace bronze A, a slender statue modelled as an equivalent rigid body freestanding on an isolated base supported on: (a) Steel Reinforced Elastomeric Bearings, (b) Fiber Reinforced Elastomeric Bearings, (c) Flat Surface Sliding Bearings, and (d) Curved Surface Sliding Bearings. The dynamic res...
Presentation
Full-text available
It is time to submit your abstract(s) to the Mini-Symposium 30 organized within the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering #COMPDYN2021. The deadline for abstract submission is 30 November, 2020. Look at the brochure for more details and remember to specify the code MS-30-CAG in the...
Data
I share a video showing the nonlinear response of a SDOF mechanical system characterized by a rate-independent #asymmetric #hysteretic #behavior and subjected to an external random force. To simulate such a hysteretic behavior, a recently developed #Asymmetric #Exponential #Model has been employed. Some details can be found here: https://www.scie...
Article
Full-text available
We present a systematic approach to the derivation of complete solutions for three-dimensional transversely isotropic elastic problems. The class of solutions derived in the paper is obtained by exploiting the entire kernel of the differential operator \(\mathcal {C}\) expressing the elastic equilibrium problem of transversely isotropic media. In p...
Article
The paper illustrates the numerical procedure, based upon a Boundary Element (BE) approach, developed to efficiently evaluate the warping functions in the Saint Venant theory of beam-like solids having both compact and thin-walled sections. Specifically, Chebyshev nodes are selected as collocation points of the BE formulation associated with the re...
Chapter
Full-text available
Nonlinear time history analysis represents the most appropriate structural analysis procedure to accurately analyze seismically base-isolated structures since their dynamic response is typically governed by a system of coupled nonlinear ordinary differential equations of the second order in time. The selection of a suitable phenomenological model,...
Article
Full-text available
An inverse strategy is developed for identifying the parameters of the hysteretic phe-nomenological constitutive model presented in Vaiana et al. (2019) and belonging to a wider class of hysteretic models. The model, differently from the celebrated Bouc-Wen one, permits the definition of either stress-strain or load-displacement relationships by cl...
Article
Full-text available
This paper presents a computational strategy that combines a novel rate-independent phenomenological model with an explicit time integration method to efficiently perform nonlinear dynamic analyses of non-stiffening hysteretic mechanical systems. The novel rate-independent model, developed by specializing a general class of uniaxial phenomenologica...
Presentation
Full-text available
Formulation of a novel algebraic hysteretic model and related matlab code.
Presentation
First #StudentResearchContest on #ComputationalNonlinearDynamics organized within the course of #AnalisiStrutturaleconElementiFiniti (Proff. F. Marmo and L. Rosati) at the Department of Structures for Engineering and Architecture of the University of Naples Federico II. Waiting for very interesting ideas!
Article
Capacity domains of reinforced concrete elements, computed according to Eurocode 2 provisions, have been investigated from a probabilistic perspective in order to examine the variability of the failure probability over different regions of the domain boundary. To this end, constitutive parameters, such as limit stresses and strains, have been defin...
Presentation
Full-text available
All the details can be found in: Vaiana N, Sessa S, Marmo F, Rosati L (2019) An accurate and computationally efficient uniaxial phenomenological model for steel and fiber reinforced elastomeric bearings. Composite Structures 211: 196-212.
Presentation
Full-text available
Preliminary Draft of the Short Course Program for Ph.D. students scheduled for February, 2019. Other details available soon.
Article
Through-the-thickness (TT) confinement of masonry and concrete panels by composite or steel reinforcements, aiming at seismic retrofit of existing structures, has recently growth in popularity. However, structural design of transversal reinforcements, modelled as an homogeneized material, is often performed by neglecting the cyclic nature of seismi...
Presentation
Full-text available
Dear Colleagues, within the International Conference on Nonlinear Solid Mechanics, to be held in Rome on June 16-19 2019, we are organizing a Mini-Symposium on Mathematical Models and Numerical Methods for Hysteretic Mechanical Systems and Materials (http://www.memocsevents.eu/iconsom2019/mini-symposia/). We are pleased to invite you to participa...
Article
Full-text available
A procedure is presented for performing Eurocode 8-compliant spectral analyses of reinforced concrete structures by means of seismic response envelopes. To account for global torsion effects in the computation of the supreme envelope an algorithmic rotational response spectrum is defined. The presented strategy turns out to be particularly appropri...
Article
Full-text available
The paper investigates the accuracy, the stability and the computational efficiency of a mixed explicit–implicit time integration approach proposed for predicting the nonlinear response of base-isolated structures subjected to earthquake excitation. Adopting the central difference method for evaluating the response of the nonlinear base isolation s...
Article
We present a uniaxial phenomenological model to accurately predict the complex hysteretic behavior of bolted steel reinforced elastomeric bearings and unbonded fiber reinforced elastomeric bearings. The proposed model is based on a set of only five parameters, directly associated with the graphical properties of the hysteresis loop, leads to the so...
Presentation
One of the most interesting aspects of the research world is the possibility to share ideas around the world. Sharing ideas is the first step toward innovation. My special thanks go to my colleague, Stefania Lo Feudo, who made the organization of this seminar at #Supméca possible. Hoping that such an event will be the beginning of future research...
Article
Full-text available
We present a general formulation of a class of uniaxial phenomenological models, able to accurately simulate hysteretic phenomena in rate-independent mechanical systems and materials, which requires only one history variable and leads to the solution of a scalar equation for the evaluation of the generalized force. Two specific instances of the cla...
Article
The results of an extensive series of dynamic and static experimental tests conducted on four Wire Rope Isolators (WRIs) under different values of vertical load are presented. The main aim of this work is identifying the mechanical characteristics of WRIs in three displacements ranges, that is, small, relatively large and large displacements ranges...

Network

Cited By

Projects

Projects (2)
Project
All Dear Colleagues – Collaborators and Their Laboratories are invited to attach to this project Their old, new, and future works or messages about "Stability of Structures under their Own Weight" what takes under consideration the stability of buildings, towers, domes, bridges, hills, slopes, dams, ... et cetera ... , and stability under own weight of columns, beams, plates, cones, ... et cetera ... , as well as designing and vulnerability of structures under dynamic, seismic, earthquake loading. ... if any RSGate Member wants to be added to the project as the Collaborator (at least a co/authorship of one work about the "Stability of Structures under their Own Weight" would be required), He needs to be a follower of a Member ... , sorry ... , but in another way, the system of the project doesn't recognize Him, and He can't be added ... , ... if any Dear Colleague–Collaborator of the Project wants to add other Colleagues, which work on the stability (at least the co/authorship of one work about the stability would be required) ... - don't hesitate to invite them ... The main rules of our Project are as follows: 1. every Colleague–Collaborator of our Project should attach at least 1 work about "Stability of Structures under their Own Weight" or a message about it, 2. every Colleague–Collaborator of our Project should follow each other, 3. every Colleague–Collaborator of our Project should read and recommend, if only would be so possibility regarding a scientific level of researches, all works with each other, 4. every Colleague–Collaborator of our Project should comment works to each other if only would be a reason to do that - comments naturally may be critical but with respect to authors, 5. every Colleague–Collaborator of our Project should cite each other - if only would be so possibility regarding research works of each one, i.e. in every new work attached to our Project should be cited a big number, e.g. 100 works of Collaborators of our Project, 6. every Colleague–Collaborator of our Project should collaborate and write common (with the Collaborators as co-authors) papers, books, ... and other kinds of works, if only would be so possibility, 7. if any Colleague–Collaborator of our Project has a possibility to help to publish works (e.g. as a member of a scientific journal or publishing house editorial board) should give massage about it in the "goal of the project" or in "updates" in our Project, 8. if any Colleague–Collaborator knows about a conference with "Stability of Structures under their Own Weight" as a panel or topic - He should inform us in the "goal of the project" or in "updates" in our Project ... I hope that the above rules of our Project would help us to get success in our scientific work ... , every one of us would like that His work would be noted, read, recommended, commented, discussed, and cited ... , but somebody should do that ... Simultaneously I would like to note that renunciation of the rules of the Project, can be taken by other Collaborators as kind of dishonesty, especially when a Collaborator would like to obtain a lot of "Reads", "Recommendations" and "Citations", but self doesn't take any so activity ... The all Dear Colleagues – Collaborators are invited to be added to the Stability of Structures’s Lab regarding the rules of the Lab: https://www.researchgate.net/lab/Stability-of-Structuress-Lab-Krzysztof-Murawski Faithfully Yours Krzysztof Murawski
Project
Dear Colleagues-Collaborators are invited by Our Dear Colleague-Collaborator Professor Chao Xu to send their papers to the "Hydraulic Engineering Modeling and Technology", accessed in the platform https://www.mdpi.com/journal/sustainability/special_issues/Hydraulic_Engineering_Modeling_Technology Dear Colleagues-Collaborators are invited to send their papers to the "International Journal of Structural Glass and Advanced Materials Research" , accessed in the platform: https://thescipub.com , where the member of the Board is our Dear Collaborator Professor Chiara Bedon ... Open access, free of charge, min 6 pages ... open yearly calls for best paper and young researcher awards ! , ... and it works ... (it was tested ...) All Dear Colleagues – Collaborators and Their Laboratories are invited to attach to this project Their old, new and future works or messages about Stability of Structures, especially: buckling, wrinkling, crimpling, crumpling ... and their energy absorption as well as about dynamic stability, slope stability .. of axially and non-axially loaded structures like columns, tubes, pipes, beams, plates, boxes, tanks, silos, pales, poles, pillars, conical shells, thin-walled structures as well as nanostructures, foams, gels.. et cetera .. made of metals, wood, plywood, bamboo, bones, composite, laminate, glass, ceramic, gypsum, concrete, rock, brick .. et cetera .. If any RSGate Member wants to be added to the project as the Collaborator (at least a co/authorship of one work about the stability and following of 50 Members of the Project would be required), He needs to be a follower of a member of the project ... , sorry ... , but in another way, the system of the project doesn't recognize Him, and He can't be added ... Naturally, all Dear Colleagues–Collaborators are asked to add every Colleague, which works on the stability (at least the co/authorship of one work about the stability and following of 50 Members of the Project would be required) ... - and don't hesitate to invite them ... Dear Colleagues–Collaborators, I would like to thank You very much for Your current engagement in our Project, but let me allow to remind You what does mean "Collaboration" in the case of our Project, i.e.: 1. every Colleague–Collaborator of our Project should attach at least 1 work about "Stability of Structures" or a message about it, 2. every Colleague–Collaborator of our Project should follow each other (at least 50 Members of the Project), 3. every Colleague–Collaborator of our Project should read and recommend, if only would be so possibility regarding a scientific level of researches, all works with each other, 4. every Colleague–Collaborator of our Project should comment works to each other if only would be a reason to do that - comments naturally may be critical but with respect to authors, 5. every Colleague–Collaborator of our Project should cite each other - if only would be so possibility regarding research works of each one, i.e. in every new work attached to our Project should be cited a big number, e.g. 100 (a minimum number: 50) works of Collaborators of our Project, 6. every Colleague–Collaborator of our Project should collaborate and write common (with the Collaborators as co-authors) papers, books, ... and other kinds of works, if only would be so possibility, 7. if any Colleague–Collaborator of our Project has a possibility to help to publish works about "Stability of Structures" (e.g. as a member of a scientific journal or publishing house editorial board) should give massage about it in the "goal of the project" or in "updates" in our Project, 8. if any Colleague–Collaborator knows about a conference with "Stability of Structures" as a panel or topic - He should inform us in the "goal of the project" or in "updates" in our Project ... I hope that the above rules of our Project would help us to get success in our scientific work ... , every one of us would like that His work would be noted, read, recommended, commented, discussed, and cited ... , but somebody should do that ... Simultaneously I would like to note that renunciation of the rules of the Project, can be taken by other Collaborators as a kind of dishonesty, especially when a Collaborator would like to obtain a lot of "Reads", "Recommendations" and "Citations", but self doesn't take any so activity ... The all Dear Colleagues – Collaborators are invited to be added to the Stability of Structures’s Lab regarding the rules of the Lab: https://www.researchgate.net/lab/Stability-of-Structuress-Lab-Krzysztof-Murawski Faithfully Yours Krzysztof Murawski