Search results for "dam"

Condition Monitoring Technologies for Synthetic Fiber Ropes - a Review

2020

This paper presents a review of different condition monitoring technologies for fiber ropes. Specifically, it presents an overview of the articles and patents on the subject, ranging from the early 70’s up until today with the state of the art. Experimental results are also included and discussed in a conditionmonitoring context,where failuremechanisms and changes in physical parameters give improved insight into the degradation process of fiber ropes. From this review, it is found that automatic width measurement has received surprisingly little attention, and might be a future direction for the development of a continuous condition monitoring system for synthetic fiber ropes.

Machine learning at the interface of structural health monitoring and non-destructive evaluation

2020

While both non-destructive evaluation (NDE) and structural health monitoring (SHM) share the objective of damage detection and identification in structures, they are distinct in many respects. This paper will discuss the differences and commonalities and consider ultrasonic/guided-wave inspection as a technology at the interface of the two methodologies. It will discuss how data-based/machine learning analysis provides a powerful approach to ultrasonic NDE/SHM in terms of the available algorithms, and more generally, how different techniques can accommodate the very substantial quantities of data that are provided by modern monitoring campaigns. Several machine learning methods will be illu…

A Boundary Element Formulation for Modelling Structural Health Monitoring Applications

2015

In this paper, a boundary element formulation for modelling pitch-catch damage detection applications is introduced. The current formulation has been validated by both finite element analyses and physical experiments. Comparing to the widely used finite element method, the current formulation does not only use less computational resources, but also demonstrates higher numerical stability. doi: 10.12783/SHM2015/221

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…