PROGETTO DI INFRASTRUTTURE STRADALI

The course aims to provide students with the knowledge necessary for the design of road infrastructures, with particular regard to the geometry of the road and the validation of the safety conditions

Class lessons

Exercises in the class

Geometric Design of road

1. INTRODUCTION TO THE COURSE

The roads in the history and evolution of the design criteria. Functional aspects, road safety and environmental problems. Design according to standard and design according to performance.

2. ROAD INFRASTRUCTURE

The new Highway Code and the D.M. 05/11/2001. The functional classification of roads. The problem related to the classification of the existing road network. The roadway: Road section, platform, roadway, road solid.

3. ROAD DESIGN ACCORDING TO STANDARD

Ministry of Infrastructures and Transport, Ministerial Decree 05/11/2001: Functional and Geometric Regulations for Road Construction. Organization of the roadway: section, additional lanes, marginal elements. Extension in the curve for the registration of vehicles and for the visibility of obstacles. Geometry of the road axis: Design speed. The contact rotates the pavement and the values ​​of the coefficient of adhesion. Clear view distances (stop, overtaking, lane change). Circulation of vehicles along the circular curves. Minimum radius and criteria for determining the inclination of the platform, the straight lines, the variable radius fittings, the design and insertion in the tracing of the clotoidic fittings. Compositional criteria of the road axis and planimetric coordination of the geometric elements. Criteria for positioning the levels. Limit slope up and down. Critical length of the level. The inclusion of lanes for slow vehicles. The vertical fittings. The plano-altimetric coordination. The project speed diagram. Speed ​​of slow vehicles. Track verification based on speed diagrams.

4. ROAD DESIGN ACCORDING TO PERFORMANCE

Safety performance: The European and national framework on the state of road safety. The European directive on the management of road infrastructure safety and the Ministerial Decree 15/03/2011. Direct measurement of road safety and performance indicators: Road safety performance functions. The distribution of Poisson and Negative-Binomial. Incident modification factors. The Bayesian Empiric Correction. Estimation of the expected number of accidents and comparative analysis of different design solutions. Direct and indirect costs of road safety. Discounting of costs and benefits. Benefits / Costs Report. The indirect measure of road safety: design speed, commercial speed, legal limit speed and operating speed. The operating speed and the geometric consistency of the track. The preventive checks on the safety of road projects. International reference framework and National Guidelines.

Traffic performance (overview): Evaluation of the level of service for the project practice. The HCM model (single or separate carriageway roads). Free flow speed. Measurements of effectiveness (average travel speed, percentage of time in queue, vehicle density).

5. FUNCTIONAL FURNITURE EQUIPMENT

The definition of clear areas and areas to be protected. Safety performances related to road margins: clear zone width, slope gradients, fixed obstacles presence, types of barriers. The influence of the characteristics of the vehicles and the modalities of deviation on the consequences of the impact. The types of safety barriers to be adopted, their location and related complementary works, the regulatory framework and the EN standards.

6. ROAD GEOTECNICS

The construction of the road body. Physical characteristics of the land. Granulometric analysis. Soil composition: specific gravity, index of voids, porosity. The measurement of water susceptibility: Atterberg limits. The classification of land. Group index, Classification CNR-UNI 10006. The compaction of the lands. Lift of the substrates. Catalog of road paving. The Volume of Road Solid. Diagrams of Areas and Volumes. Compensation works. Construction machinery and equipment for earthmoving.

7. DRAFTING THE ROAD PROJECT

Design levels, basic mapping, tracing study. Executive design: type sections, layout plan, project plan, layout of the hydraulic works of defense, longitudinal profile, cross-sections, notebook of the sections and analytical calculation of the volumes. Construction details of vertical fittings, construction details of works of art, general chorography, project report. Computer-assisted planning.

-T. Esposito, R. Mauro “La geometria stradale”. Hevelius Edizioni.

-T. Esposito, R. Mauro “La progettazione Funzionale delle strade”. Hevelius Edizioni.

-M. Agostinacchio, D. Ciampa, S. Olita “Strade Ferrovie Aeroporti”, EPC Libri

-M. Agostinacchio, D. Ciampa, S. Olita «La Progettazione delle Strade», EPC Libri, 2007

-Lamm, Cafiso et alt. “How to make two lane rural roads safer”,Witpress, 2007

- Santagata, Le Strade - Teoria e Tecnica delle Costruzioni Stradali, Pearson, 2016

- Highway Safety Manual. AASHTO, 2010