72816 - Laboratory of Bridge Design M

Learning outcomes

The student develops an individual design project of a simple r.c. precast-beam bridge. To this purpose, during the course, the design and dimensioning criteria of a girder bridge deck and of the corresponding substructures are studied; numerical and graphical applications are then required.

Course contents

REQUIREMENTS / PRIOR KNOWLEDGE

A prior knowledge and understanding of the concepts of structural mechanics, construction techniques and geotechnics is required to attend with profit this course. In particular, the student should be really conversant with structural design.

This knowledge is usually acquired by passing the exams of Scienza delle Costruzioni (Structural Mechanics), Teoria delle Strutture (Theory of Structures), Tecnica delle Costruzioni (Building Techniques), Calcolo Automatico delle Strutture (Computational Structural Mechanics), Progetto di Strutture (Design of Structures), Geotecnica (Geotechnics).

Fluent spoken and written Italian is a necessary pre-requisite: all lectures and tutorials, and study material will be in Italian. Part of the study material will be given in English.

 

COURSE CONTENTS

1. THE DESIGN OF A PRECAST-BEAM BRIDGE

Characteristics of the design project
Elements of road geometry
The transversal cross-section of the bridge deck
The crash barriers

2. DESIGN CRITERIA OF THE BRIDGE DECK

The general approach of the design
The slab design
Simplified analysis for the transversal load distribution

3. PRESTRESSED CONCRETE STRUCTURES

History, development and general principles of prestressed concrete structures
Prestressing technologies (bonded and unbounded tendons, pre-tensioning and post-tensioning systems)
Codes
Determination of the internal forces
Flexure and shear
Loss of prestress
End anchorages and local verifications

4. THE CALCULATION OF THE PRESTRESSED CONCRETE BEAMS

The loads
The stages of loading
Dimensioning and verification of the prestressed concrete beams

5. BEARING DEVICES AND DECK JOINTS

Classification of the bearing
Reinforced elastomeric bearings
Seismic devices
Joint typologies

6. THE SUBSTRUCTURES

The piers
The abutments

7. THE LOADING TESTS

Test setup
Deflection measurements

8. FATIGUE VERIFICATIONS

General issues about fatigue strength of materials
Fatigue verifications for steel and r.c. bridges
Load spectra by the codes
Applicative example with reference to a composite steel-beam-and-slab bridge

Readings/Bibliography

TEXTBOOKS ON BRIDGE DESIGN
- G. Albenga, I ponti, Voll. I e II, Ed. UTET, Torino, 1953
- E. Siviero, Il progetto del ponte, Ed. Coll. Ingg. Prov. Padova, Padova, 1994
- M.P. Petrangeli, Progettazione e costruzione di ponti, IV ed., Ed. Masson, Milano, 1997
- F.Martinez, Ponti e viadotti: concezione, progetto, analisi, gestione, Ed. Pitagora, Bologna, 2000
- Autori vari, Nuovi orientamenti per la progettazione di ponti e viadotti, Ed. Dario Flaccovio, Palermo, 2005

TEXTBOOKS ON PRESTRESSED REINFORCED CONCRETE STRUCTURES
- C. Cestelli Guidi, Cemento armato precompresso, Ed. Hoepli, Milano, 1987
- F. Leonhardt, C.a. e c.a.p. Calcolo di progetto e tecniche costruttive. I ponti, Ed. Tecniche Milano, Milano, 1979
- T.Y. Lin, N.H. Burns, “Design of prestressed concrete structures", Wiley, 1982
- R. Walther, M.Miehlbradt, "Progettare in calcestruzzo armato", Hoepli, 1990
- L. Santarella, "Il cemento armato", 22a ediz., Hoepli, 1998
- L. Goffi, P. Marro, "Appunti sul Cemento armato precompresso", CLUT editrice, Torino, 1998

GENERAL TEXTBOOKS ON STRUCTURAL DESIGN
- O. Belluzzi, Scienza delle costruzioni, Vol. II, Ed. Zanichelli, Bologna, 1966
- P. Pozzati, Teoria e tecnica delle strutture, Vol. I (1972) e Vol. II (1977) Ed. UTET, Torino
- Autori vari, Manuale di Ingegneria Civile, Volume II, Ed. Zanichelli/ ESAC, Bologna, 1991

Teaching methods

Frontal lessons mainly at the blackboard (occasional use of Power-Point slides).
Numerical applicative examples at the blackboard.
Revision of the individidual design projects developed by the students with the help of a tutor.

Assessment methods

Assessment of the individual design project (of a precast-beam bridge) developed by the student.
This assessment consists in:
1. examination of the technical drawings
2. analysis of the technical report
3. calculation and design criteria and technical drawings of the construtive details

A positive evaluation of the individual design project allows the access to the final oral exam of the associated BRIDGE DESIGN M course.

Teaching tools

Possible lecture-notes supplied by the teacher.
Power-Point presentations.

Links to further information

http://www.unibo.it/docenti/stefano.silvestri

Office hours

See the website of Stefano Silvestri