1,721,244 research outputs found
FORMULAZIONE GENERALE DELLE EQUAZIONI DEI PONTI STRALLATI AUTOANCORATI CON SOSPENSIONE A CORTINA
No full text
Analisi della vulnerabilità sismica del Liceo “Quinto Orazio Flacco
No full textDue to the high level of uncertainty characterizing existing buildings, the evaluation of the seismic behaviour of these structures must be preceded by an accurate reconstruction of their history. At this aim the present paper focuses firstly on the historical analysis and successively on the investigation of the seismic vulnerability of the "Quinto Orazio Flacco" school, built in Bari in 1933. The three-storey main masonry building has a M-shaped plan with maximum dimensions equal to 57.8 m and 82.4 m respectively in the transversal and longitudinal directions. In 1963 a new reinforced concrete building separated from the pre-existent masonry one was realized along its free perimeter. By the analysis of the capacity curves obtained by suitable pushover procedures performed separately for each building, it emerges that masonry and reinforced-concrete buildings are vulnerable to earthquake-induced structural pounding in the longitudinal direction. In order to investigate this structural aspect, in this paper time history analyses are carried out, using detailed finite element three-dimensional models of the two buildings and a numerical procedure suitable elaborated by Matlab software
Seismic vulnerability of the “Quinto Orazio Flacco” school
No full textHistorical buildings in seismically active regions are severely damaged by earthquakes, since they certainly were not explicitly designed by the original builders to withstand seismic effects. The assessment of their seismic safety is an important first step in planning the appropriate interventions for improving their pertinent resistance. This paper deals with the investigation of the seismic behaviour of the "Quinto Orazio Flacco" school. Its construction goes back to the early 20th century. The three-storey main masonry building has a M-shaped plan with maximum dimensions equal to 57.8m and 82.4m respectively in the transversal and longitudinal directions. In 1963 a new reinforced concrete building separated from the pre-existent masonry one as realized along its free perimeter. In order to simulate the actual seismic behaviour of the school, both non-linear static procedures and time history analyses are carried out, using detailed finite element models of the two buildings and suitable numerical procedures
Dynamic response of a bridge deck with one torsional degree of freedom under turbulent wind
No full textUnder special conditions of turbulent wind, suspension and cable-stayed bridges could reach
instability conditions. In various instances the bridge deck, as like a bluff body, could exhibit singledegree
torsional instability. In the present study the turbulent component of flow has been considered as a
solution of a differential stochastic linear equation. The input process is represented by a Gaussian zeromean
white noise. In this paper the analytical solution of the dynamic response of the bridge has been
determined. The solution has been obtained with a technique of closing on the order of the moments
Una formulazione approssimata del comportamento elasto-viscoso di strutture non omogenee ad inerzia e schema statico variabile nel tempo
No full textAdeguamento sismico di strutture intelaiate in c.a. progettate con le vecchie Norme Tecniche
No full textProper Orthogonal Decomposition for simulating the alongwind Equivalent Static Force of long-span bridges
No full textThis paper develops and discusses a method by which it is possible to evaluate the Equivalent Static Force (ESF) of wind in the case of long-span bridges. Attention is focused on the alongwind direction. The study herein carried out deals with the classical problems of determining the maximum effects due to the alongwind action and the corresponding ESFs. In order to derive the wind-induced effects acting on the deck, the Gust Effect Factor (GEF) technique is extended to long-span bridges. By adopting the GEF technique, it is possible to define the ESF that applied on the structure produces a specified maximum effect. Nevertheless in the case of long-span bridges the application of the ESF associated to a specified maximum effect does not furnish the correct maximum values of other wind-induced effects acting on the deck. Based on this observation, a new technique is proposed which allows to define an ESF able to simultaneously reproduce the maximum alongwind effects of the bridge deck. The proposed technique is based on the GEF and the Proper Orthogonal Decomposition (POD) techniques and represents a valid instrument of research for the understanding of the wind excitation mechanism
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