http://elea.unisa.it/xmlui/handle/10556/49 2026-04-20T09:53:02Z 2026-04-20T09:53:02Z Penna, Rosa http://elea.unisa.it/xmlui/handle/10556/4283 2025-04-30T15:21:55Z 2018-07-25T00:00:00Z

Mechanical behavior of web-flange junctions of thin-walled pultruded fiber-reinforced polymer profiles: an experimental and numerical evaluation Penna, Rosa Fibre-reinforced polymer (FRP) composites represent a class of advanced materials whose use has spread from the aeronautical, mechanical and naval industry to civil infrastructure, which has generated a new set of challenges. Composites have unique features, such as high corrosion resistance, electromagnetic transparency, low maintenance costs and high strength-to-weight ratio. During the past few decades, pultruded fibre-reinforced polymer (PFRP) composites have been used in several successful applications related to corrosive environments such as cooling towers, mining and petrochemical facilities, water and wastewater treatment plants, as well as, off-shore structures. By mid-1990s, major applications of these materials were initiated in the field of seismic and corrosion repair and strengthening of existing reinforced concrete bridges and buildings. Historically, off-the-shelf PFRP composites were developed and designed by the pultrusion industry and were intended for low-stress applications. Recently, composites have been introduced as primary structural members to replace or complement other conventional materials, such as steel, concrete and wood, in critical applications such as bridge decks, pedestrian bridges, and recently in highway bridges and other infrastructural systems. ... [edited by Author] 2012 - 2013

2018-07-25T00:00:00Z Carullo, Pellegrino http://elea.unisa.it/xmlui/handle/10556/3067 2025-04-30T14:48:38Z 2017-10-12T00:00:00Z

La scuola per l'infanzia e primaria in Italia tra architettura e pedagogia. Proposte per la trasformazione degli spazi di apprendimento Carullo, Pellegrino Starting from the recent law provisions contained in the MIUR (Italian Ministry of Education) Plan - and aimed to revamp school buildings, this Ph.D. thesis has investigated methods and preliminary criteria applicable to the transformation of learning spaces for preschool and primary school, presuming an interconnection among “pedagogy”, “architecture” and “technical regulations”. The results of the research are therefore to be found in both pedagogy and architecture, which have characterized the Ph.D. activities. That is to say, identifying meta-project guidelines for the transformation of existing spaces for preschools and primary schools in Italy – after analyzing a complex critical apparatus divided into working phases validated by the choice and analysis of case histories and by the selection of general and technical bibliographies. This made possible the development of a research based on the widespread knowledge of the phenomenology of the first-level school-system, through the understanding of pedagogical, architectural and legislative values and parameters that have served as the basis of its founding elements, as time passed by. As a result of such an interaction, several concept proposals have been put forward to scientifically implement the ongoing debate on the themes of strategic connections for models of “school regeneration”, that can affect the quality and organization of the architectural space at the service of Science of Education. It is clear that such a work presents some critical method- and content-related points. In the first case, it comes to acknowledging that the research identifies different procedures aiming to offer designers a technical and cultural argument-based framework, which is expressed above all through general operational guidelines. A sort of “evaluation and conceptual manual” apart from current “literature”, and therefore subject to changes in the parameters adopted. The second case complements the first one: namely, this Ph.D. experience could have continued subsequently as an “applied research” field activity, so as to verify the theses assumed in the foreword and gathered from meta-project results. Due to the general purposes of the different phases of the research, such a goal could not be achieved in this work and is therefore addressed to other and subsequent scientific research activities... [edited by Author] 2015 - 2016

2017-10-12T00:00:00Z Giordano, Carla http://elea.unisa.it/xmlui/handle/10556/2607 2025-04-30T14:24:08Z 2017-05-22T00:00:00Z

Abitare la sanità: la riqualificazione dell'edilizia ospedaliera mediante il Building information modeling Giordano, Carla 2013 - 2014

2017-05-22T00:00:00Z Lodato, Alessio http://elea.unisa.it/xmlui/handle/10556/2467 2025-04-30T14:25:58Z 2016-05-24T00:00:00Z

Analisi dell’affidabilità sismica delle strutture isolate mediante dispositivi Friction Pendulum Bearings System Lodato, Alessio The thesis investigates the seismic reliability of isolated structures with FPBs (Friction Pendulum Bearings) towards failure due to high vertical component excitation and friction coefficient variations. In the end, it has been studied the influence of the uncertainty of the input excitation on the vulnerability of complex structures such as viaducts in the case of different seismic isolation strategies application. The last seismic events (Christchurch 2011, L’Aquila 2009) have highlighted lacks in the actual design philosophies (PBD) due to the high structural damage experimented by structures. The Passive Control Technique of seismic response allows high structural performances respect to the one of fixed base structures, in this way making sustainable the repairing costs of structures in the case of medium high intensity seismic event. After introducing a rich bibliography on matemathical theory of base isolated structures, with some remarks on the state space formulation which allow to carry out modal analysis of non classically damped structures such as the one object of the study, on the mechanical and dynamical behavior of Friction Pendulum System device and on the current Technical Code in Italy (NTC08), it has been introduced the theme to be investigated. Being the FPS behavior related to the friction force, the seismic response can be affected by particular seismic event as near fault event characterized by high vertical component intensity of seismic excitation. Moreover the degradation of the sliding interface due to velocity, pressure and temperature variations can influence the seismic response of the device. To the scope of investigating the collapse phenomenon of the device, non linear dynamic analysis have been carried out through deterministic parametric methods with different near fault input excitations, on two different systems: the first described by a rigid superstructure and isolation system described by the Nagarajaiah model (1990), the second representative of a benchmark r.c. building of four levels (Almazan 2003). The subsequent stochastic analysis carried out by means of the use of Montecarlo simulation, taking advantage of the inversion method, on a system described by rigid superstructure and isolation system described by a rigid-plastic behavior with hardening, have highlighted the relation between the stochastic response and the uncertainty of the friction coefficient in the case of sinusoidal excitation. Finally, it has been investigated the vulnerability of bridge structures in different isolation system design configurations by using fragility analysis, carried out taking advantage of the Multi Stripes method (Baker 2014). Results show the probability of exceedance of the limit state considered variations taking into account the uncertainty of the input excitation. [edited by Author]; Il lavoro di tesi ha indagato l’affidabilità sismica delle strutture isolate mediante dispositivi FPBs (Friction Pendulum Bearings) nei confronti dei fenomeni dello scalottamento e delle variazioni del coefficiente d’attrito che caratterizza l’interfaccia di scorrimento del dispositivo. In ultima analisi, è stata indagata l’influenza dell’aleatorietà dell’input in ingresso sulla vulnerabilità di strutture complesse quali viadotti nel caso di applicazione di differenti strategie di isolamento. Gli ultimi eventi sismici (Christchurch 2011, L’Aquila 2009) hanno evidenziato carenze nelle filosofie prestazionali attuali (PBD) a causa dell’elevato danneggiamento agli elementi strutturali sperimentato dalle costruzioni. Le tecniche di controllo passivo della risposta sismica consentono elevate prestazioni in termini di performance strutturali rispetto a quelle a base fissa, in tal modo rendendo sostenibili i costi di riparazione delle costruzioni in caso di eventi sismici di medio alta intensità. Dopo una ricca bibliografia sulla teoria matematica alla base delle strutture isolate, con cenni alla formulazione nello spazio degli stati che consente l’analisi modale di strutture non classicamente smorzate, sul comportamento meccanico e dinamico del dispositivo Friction Pendulum System e sulle attuali Norme Vigenti in Italia (NTC08), si è introdotta la problematica oggetto di studio. Essendo il comportamento del dispositivo FPS dipendente dalla forza d’attrito, la risposta sismica può essere affetta da particolari eventi sismici di tipo near fault caratterizzati da componenti verticali dell’eccitazione sismica di elevata intensità. Inoltre l’usura della superficie di scorrimento dovuta a variazioni di velocità, pressione e temperatura può influenzare la risposta sismica del dispositivo. Al fine di indagare il fenomeno dello scalottamento del dispositivo sono state condotte analisi dinamiche non lineari mediante metodologie deterministiche parametriche con differenti eccitazioni in ingresso di tipo near fault, su un sistema descritto da una sovrastruttura rigida e sistema di isolamento descritto dal modello di Nagarajaiah (1990), e su un sistema rappresentativo di un edificio benchmark in c.a. a 4 livelli (Almazan 2003). Inoltre, le successive analisi stocastiche condotte mediante l’utilizzo della simulazione Montecarlo, sfruttando il metodo dell’inversione, su un sistema descritto da sovrastruttura rigida e sistema di isolamento descritto da una legge attritiva rigido plastica con incrudimento, hanno messo in evidenza la dipendenza della risposta stocastica dall’aleatorietà del coefficiente d’attrito nei confronti di eccitazioni sinusoidali. Infine è stata indagata la vulnerabilità di strutture da ponte in differenti configurazioni di progetto del sistema di isolamento mediante analisi di fragilità condotte sfruttando il metodo Multi Stripes (Baker 2014). Esse mostrano le variazioni nella probabilità di superamento degli stati limite in considerazione dell’aleatorietà dell’input in ingresso. [a cura dell'Autore] 2014 - 2015

2016-05-24T00:00:00Z