1,720,994 research outputs found
L'influenza dei criteri di dimensionamento sul comportamento sismico dei telai in acciaio.
No full text4° Convegno Nazionale A.N.I.D.I.S. "L'Ingegneria Sismica in Italia", Milano, 4-6 October 198
L'influenza dei criteri di dimensionamento sul comportamento sismico dei telai in acciaio.
No full text4° Convegno Nazionale A.N.I.D.I.S. "L'Ingegneria Sismica in Italia", Milano, 4-6 October 198
A new approach to assess the influence of road roughness on driver speed behavior based on driving simulator tests
No full textVehicle speed is one of main parameters describing driver behavior and it is of paramount importance as it affects the travel safety level. Speed is, in turn, affected by several factors among which in-vehicle vibration may play a significant role. Most of speed reducing traffic calming countermeasures adopted nowadays rely on vertical vibration level perceived by drivers that is based on the dynamic interaction between the vehicle and the road roughness. On the other hand, this latter has to be carefully monitored and controlled as it is a key parameter in pavement managements systems since it influences riding comfort, pavement damage and Vehicle Operating Costs. There is therefore the need to analyse the trade-off between safety requirements and maintenance issues related to road roughness level. In this connection, experimental studies aimed at evaluating the potential of using road roughness in mitigating drivers’ speed in a controlled environment may provide added value in dealing with this issue. In this paper a new research methodology making use of a dynamic driver simulator operating at the TEST Laboratory in Naples is presented in order to investigate the relationship between the driver speed behavior on one hand, and the road roughness level, road alignment and environment, vehicle characteristics on the other. Following an initial calibration phase, preliminary results seem fairly promising since they comply with the published data derived from scientific literature
Study of the impact of vehicles against the concrete barriers delimiting the area of approach to narrower carriageways in function of the barrier's feature.
No full text
Sub Ballast Role in Dynamic Train-Track-Superstructure Interaction in High Speed Lines
No full textPARI
Structural Analysis of Bituminous Road Pavements Embedding Charging Units for Electric Vehicles
No full textAmong the arising technologies for electric mobility, the on-the-road (dynamic) vehicle charging appears to be a promising solution in order to overcome the current limitations of the electric vehicles’ batteries. For achieving this purpose, the use of Charging Units (CUs) embedded into the road pavements is needed. These CU are made of a cement concrete box in which the electric technologies are allocated. However, the CUs have not to be detrimental for the structural behavior of the pavements, including their load resistance performances. The lack of scientific studies in the available literature demonstrate that the topic is not fully investigated. Moreover, the available scientific papers assume the CU as a solid, not considering it as a box (having a void for the electric technologies). However, it is a key factor for the pavements’ structural response. This is the reason why this research was devoted to assess the structural response of electrified roads (e-roads), in which the CUs are embedded, compared to the traditional roads (t-roads), using a Finite Element Modelling (FEM) approach. Therefore, the main scope of this study is the optimization of the void dimensions into CU from a pavement structural performances point of view. The optimization included different cross-sectional geometries and load positions. As a result of these FEM investigations, a first set of interesting outcomes were obtained, as shown and discussed in the paper
A Methodological Approach for the Safety Evaluation of Minor Two-Lane Rural Roads
No full textA methodological approach for the safety evaluation of two lane rural roads which use both analytical procedures referring to alignment design consistency models and the "Safety review" process is suggested. Alignment features and design consistency related to road safety conditions can be effectively evaluated using both Accident Prediction Models and "Safety Criteria" defining three different levels of judgment (good, fair, poor). The model of IHSDM was adapted to the Italian accident and road design characteristics. The Safety Criteria allow to evaluate three different levels of inconsistencies in the horizontal alignment. It is useful to integrate the results of the analyses carried out from the theoretical-experimental models with those deriving from the judgments collected on inspected sites (the Safety Reviews). The low cost of the procedure and his capability in addressing the safety problems not identified in the previous steps highlight the effectiveness of the Safety Inspection method as part of the safety evaluation process on existing roads. The methodological framework presented in the paper, consisting of safety inspections carried out as support of the analyses conducted through the theoretical-experimental models, will be applied in Italy as part of the “IASP” project financed by European Commission
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