Search results for "DAMAGE"
showing 10 items of 1289 documents
Modal Analysis of a Reinforced Concrete Frame in Various States of Damage
2005
The purpose of this paper is to report selected results of an experiment in which two, natural size r/c frames were put on shaking table and subjected to a sequence of seismic excitations with increasing intensity interlaced with low level, diagnostic tests. The shaking table experiment aimed at working out new methodology for monitoring vibrations of r/c structures to assess their state. Characteristic decrease of natural frequencies and increase of structural damping was observed and analyzed in detail. It was interesting to note 20 per cent drop in natural frequencies prior to visual detection of any cracks.
The interphase elasto-plastic damaging model
2013
Heterogeneous materials present a mechanical response strongly dependent on the static and kinematic phenomena occurring in the constituents and at their joints. In order to analyze this kind of materials it is a common practice to distinguish a macroscopic length scale of interest from a mesoscopic one, where the mesoscopic length scale is of the order of the typical dimensions of the constituents. At the mesoscopic level the interaction between the units is simulated by mean of apposite mechanical devices. Among these devices is popular the zero thickness interface model where contact tractions and displacement discontinuities are the primary static and kinematic variables respectively. H…
Responsability in management of the early stages in clinical evaluation of oral-facial traumatic events
2019
Obiettivi Scopo del presente lavoro è esaminare gli eventi traumatici oro-facciali e i loro effetti e individuare linee e schemi comportamentali e un linguaggio clinico e medico-legale appropriato che aiutino a identificare con immediatezza l’evento traumatico e i suoi postumi, e una corretta gestione dello stesso, in modo consono alle esigenze assicurative e/o giudiziarie, oltre che strettamente cliniche. Si vuole, inoltre, sottolineare l’importanza clinica e medico-legale della prima visita. Materiali e metodi I diversi aspetti dell’argomento sono esaminati sia da un punto di vista clinico che medico legale. Attraverso l’analisi delle diverse tipologie di trauma e degli schemi procedurali…
Vulnerability of a Damaged Bridge Abutment in a Seismic Area
2018
The case of the abutment of a motorway urban viaduct damaged by human intervention is presented. Built in the 1960s, it lies in a critical seismic area and the human-induced damage involved the elements of the abutment foundation. The structure is geometrically complex and the evaluations of its structural safety were carried out by applying Italian codes from different times: those concerning the time of construction, those of a recent past (1996), and those of the present (2008), inspired by Eurocodes. A comparison between the safety checks performed and the requirements of all these codes is presented and discussed, especially regarding safety coefficients after the damage was done. Two …
An integral equation for damage identification of Euler-Bernulli beams under static loads
2004
A Strain Sensing Structural Health Monitoring System for Delaminated Composite Structures
2012
Structural Health Monitoring (SHM) for composite materials is becoming a primary task due to their extended use in safety critical applications. Different methods, based on the use of piezoelectric transducers as well as of fiber optics, has been successfully proposed to detect and monitor damage in composite structural components with particular attention focused on delamination cracks.In the present paper a Structural Health Monitoring model, based on the use of piezoelectric sensors, already proposed by the authors for isotropic damaged components, is extended to delaminated composite structures. The dynamic behavior of the host damaged structure and the bonded piezoelectric sensors is m…
Fattispecie indennitaria e danno da processo penale
2017
L’indennizzo per i danni del processo penale è inquadrato nell’ambito della responsabilità da attività lecita della pubblica amministrazione. Nel diritto amministrativo la concezione “assistenzialistica”, ispirata a un regime di specialità, si affianca a un modello fondato sul paradigma civilistico, con influenze derivanti dalla responsabilità dell’imprenditore da rischio, ovvero dalle molteplici fattispecie di responsabilità oggettiva. Spesso il parametro indennitario si confonde con quello risarcitorio extracontrattuale o precontrattuale. In alcuni casi, gli sviluppi della fattispecie pongono l’accento sulla “tutela dell’affidamento” del privato o sulla «colpa di apparato». Analoghe forme…
La controvertida indemnización por lesión de los derechos fundamentales de las personas trabajadoras
2021
El reconocimiento y cuantificación de las indemnizaciones por vulneración de derechos fundamentales en el orden social de la jurisdicción ha sido, desde siempre, y por diferentes razones, una cuestión especialmente compleja. En ciertos casos ¿como sucede con la automaticidad del daño moral derivado de la violación del derecho fundamental- las contradicciones y vaivenes judiciales son ya un ¿clásico¿ en la materia; en otros, las dudas guardan relación con el significado y la repercusión que una incorporación legal efectuada por la LRJS -la finalidad preventiva de la indemnización- debe tener en la práctica judicial; y, finalmente, las discrepancias se refieren a la posibilidad misma de conce…
Genotoxicity of dental materials.
1996
This study was performed to characterize the (possible) DNA-damaging properties of dental materials and to identify specific compounds that contribute to this genotoxicity. For screening, three tests that assay for different aspects of genotoxicity (i) the bacterial umu-test; (ii) the eucaryotic DNA synthesis inhibition test; and (iii) the in vivo alkaline filter elution technique were chosen. This investigation gives several lines of evidence that most dental materials tested (14 chemical monosubstances present in dental devices and 7 extracts of dental materials) yield 'positive' results in at least one of the genotoxicity tests, however, with effects ranging from 'borderline' to 'strong …
High spatial resolution analysis of the iron oxidation state in silicate glasses using the electron probe
2018
The iron oxidation state in silicate melts is important for understanding their physical properties, although it is most often used to estimate the oxygen fugacity of magmatic systems. Often high spatial resolution analyses are required, yet the available techniques, such as μrXANES and μMössbauer, require synchrotron access. The flank method is an electron probe technique with the potential to measure Fe oxidation state at high spatial resolution but requires careful method development to reduce errors related to sample damage, especially for hydrous glasses. The intensity ratios derived from measurements on the flanks of FeLα and FeLβ X-rays (FeLβf/FeLαf) over a time interval (time-depend…