0000000000188326
AUTHOR
Gaetano Russo
Seismic behavior of exterior RC beam-column joints without code-specified ties in the joint core
Abstract Beam-column joint design for reinforced concrete (RC) buildings is a critical issue for modern earthquake engineering, because for these structural elements, the current codes provide several geometrical constraints and reinforcement provisions, which may be very complex to implement during the construction phase. To investigate how a construction error might influence the joint behavior, two identical full-scale exterior beam-column joints specimens are built, according to Italian Building Code specifications for the high ductility class, but without the required horizontal ties inside the joint panel. This construction error could be plausible because, according to the design dra…
Structural behavior of the old masonry bridge in the Gulf of Castellammare
Abstract Masonry arch bridges represent a very significant part of the heritage of road and railway artworks all over the word and especially in the Mediterranean area, both in terms of: numbers; reduced environmental impact; and static efficiency. In these cases, the cost of maintenance is often limited to the content and channeling of surface water and control of vegetation, which can eventually take root on the joints of the masonry at the shoulders. In masonry bridges, there are no expansion joints or hinges with support equipment or trolleys, as in metal bridges and reinforced concrete ones, or paint, or resin surface protection, all items that affect the cost of maintenance. The perma…
LONG-TERM STRUCTURAL DEFICIENCIES IN A MAT FOUNDATION ON CLAY SOIL
A 3-story building with a mat foundation consisting of a slab on a grid of grade beams performed poorly on clay soil. Cracking of the slab became rogressively worse as a result of the incorrect esign and fluctuations in the groundwater pressure under the foundation. The cyclic presence and absence of water rusted the steel reinforcement, and the sulfates in the clay soil caused formation of ettringite in the concrete. Plastic hinges formed in the slab and settlements occurred, causing damage to the beams. The situation is still in progress and may lead to the collapse of the structure under normal service conditions. The geotechnical and structural investigations performed to survey and ass…
Supero-lateral Hoffa's fat pad edema: associazione con malallineamento o conflitto femoro-rotuleo.
OBIETTIVO. Il nostro studio è stato disegnato per valutare sistematicamente la correlazione dell'edema della porzione supero-laterale del corpo adiposo di Hoffa con diversi parametri anatomici della morfologia trocleare e dell'allineamento della rotula. MATERIALI E METODI. Abbiamo riesaminato in maniera retrospettiva 50 esami RM di ginocchio di 47 pazienti, eseguiti nel periodo gennaio 2011-marzo 2011 per la presenza di edema nella porzione supero-laterale del cuscinetto adiposo di Hoffa e di anomalie anatomiche associate dell'articolazione femoro-rotulea. RISULTATI. Dei 50 esami, 25 (50%) hanno mostrato edema della porzione supero-laterale del corpo adiposo di Hoffa, e differenze statistic…
Testing of “Global Young's Modulus E” on a rehabilitated masonry bell tower in Venice
Abstract This paper shows the effectiveness of the techniques chosen for the rehabilitation of the historic “Sant'Andrea” masonry bell-tower in Venice. The achieved rehabilitation projects based on the indenting technique consisting in removing and replacing bricks in bad conditions, and on the isolation of the bells at the belfry quote, respect all the constraints represented by the aesthetic and structural features of the building. Moreover, the experimental analyses used to define the existing state of the structure are described in detail. The tower is also an interesting case study for the validation of the proposed method to determine the global young's modulus in a rehabilitated maso…
In-situ NDT testing procedure as an integral part of failure analysis of historical masonry arch bridges
Abstract A nineteenth-century masonry arch bridge was analyzed as an illustrative example to explain the role of in-situ test campaigns in failure analysis and retrofit design. Test results were studied to find out the advantages of each technique, with the aim of proposing an optimized in-situ testing procedure. Standard static penetrometer, flat jack, thermographic and georadar in-situ tests were conducted. Traffic effects were analyzed by means of vibrational tests. The experimental analysis performed to investigate damage on the bridge structures shows the degree of reliability offered by each technique in evaluating specific information and reproducing the global behavior of the struct…
Trattamento con pappa piastrinica delle lesioni parziali isolate del legamento crociato posteriore: nostra esperienza e risultati preliminari.
OBIETTIVO. Lo scopo del nostro lavoro è quello di valutare l'efficacia del trattamento con pappa piastrinica (PRP) delle lesioni parziali isolate del legamento crociato posteriore. MATERIALI E METODI. Sono stati arruolati 7 pazienti sportivi (5 uomini e 2 donne; range d'età: 18-43 anni; età media: 27 anni) che avevano subito una lesione parziale isolata del legamento crociato posteriore diagnosticata con esame RM ed ecografia. E' stata eseguita una singola iniezione di PRP. L'outcome clinico è stato valutato utilizzando una scala visuo-analogica (VAS) del dolore il giorno dell'iniezione (T0), dopo tre settimane (T1), dopo sei settimane (T2); inoltre, per valutare la struttura del legamento …