Unit DESIGN AND MANAGEMENT OF BRIDGES AND LARGE STRUCTURES
- Course
- Civil engineering
- Study-unit Code
- A003036
- Curriculum
- In all curricula
- Teacher
- Ilaria Venanzi
- Teachers
-
- Ilaria Venanzi
- Hours
- 84 ore - Ilaria Venanzi
- CFU
- 12
- Course Regulation
- Coorte 2022
- Offered
- 2022/23
- Learning activities
- Caratterizzante
- Area
- Ingegneria civile
- Academic discipline
- ICAR/09
- Type of study-unit
- Obbligatorio (Required)
- Type of learning activities
- Attività formativa monodisciplinare
- Language of instruction
- Italian (with availability to teach in English if requested by international students, subject to approval of Department Committee)
- Contents
- Actions on constructions with particular reference to bridges. Influence lines. Steel-concrete composite beams and columns. Prestressed concrete beams. Two-dimensional structures: reinforced concrete plates, orthotropic steel plates, tubes, girder bridges.
- Reference texts
- E.Cosenza, G.Manfredi, M.Pecce "Strutture in cemento armato - Basi della progettazione - Terza Edizione" Hoepli, 2019.
Nigro E., Bilotta A., "Progettazione di strutture composte acciaio-calcestruzzo", Palermo, Dario Flaccovio Editore, 2011.
Radogna E.F., "Tecnica delle costruzioni" Volumi 2 e 3, Milano, Masson ESA, 1996.
Cestelli-Guidi C., "Cemento armato precompresso", Milano, Hoepli, 1987.
M.P. Petrangeli, Progettazione e Costruzione di Ponti, CEA - Casa Editrice Ambrosiana ingegneria, 1996.
Additional references edited by the professor. - Educational objectives
- Design of Structures combines theoretical knowledge on structural mechanics and practical skills consisting of the ability to design civil constructions, including the ability to prepare a computational report and to elaborate design sheets and drawings at the executive level.
The principal aim of the course consists of providing the students with the theoretical knowledge and the practical skills for structural analysis and for the design of structural elements in prestressed concrete and in steel-concrete composite section, as well as two-dimensional structures such as plates and tubes and special elements.
The main acquired knowledge (1st Dublin descriptor) will be:
- how to evaluate actions on constructions
- theory of influence lines
- theory of steel-concrete composite constructions
- basic elements of the theory of concrete viscoelasticity
- theory of prestressed concrete
- linear first order analysis of two-dimensional structures
- typical structural schemes in buildings and in bridges
The main competences (2nd and 3rd Dublin descriptors) will be:
- being able to draw influence lines of general frames and using such lines in order to assess the most unfavorable configuration of the loads.
- designing and graphically drawing structural elements in reinforced concrete, prestressed concrete and in steel-concrete composite section
- conceive the structural scheme of civil constructions such as buildings and bridges - Prerequisites
- In order to understand the theoretical notions and to be able to apply the techniques described within the course of Design of Structures, students are required to have the following knowledge:
• Strength of Materials: the fundamentals of the Theory of Elasticity, the Energy Theorems, the ability to solve statically determined and undetermined structures (computation of boundary reactions, internal actions and generalized displacements)
• Structural Design: theory of concrete and steel structures both in the elastic range and at the ultimate limit state, ability to design simple structural elements in reinforced concrete and in steel with reference to the serviceability and ultimate limit states as required by the technical standards.
This knowledge represent a mandatory prerequisite for the student who aims to effectively attend the course. - Teaching methods
- The course is organized as follows:
- class lessons on all the topics of the course
- proposal and solution of exercises in preparation of the written test
- optional discussion time regarding the solution of design excercises. - Learning verification modality
- The exam consists of a written and an oral test that normally take place on the same day.
The written test has a duration of 2 hours and consists of the solution of 2 problems, among which one typically focusing on influence lines and the other one on a practical design/assessment aspect.
The first part of the oral test consists of an interview about 15 minutes long aiming to ascertain: i) the knowledge level and the understanding capability acquired by the student on theoretical and methodological contents as indicated in the program (1st Dublin descriptor), ii) the competence level in the presentation of the possible technical solutions in problems of structural design (2nd Dublin descriptor), iii) the autonomy (3rd Dublin descriptor) in proposing the most appropriate approach for any applicative field. The oral test will also allow to verify the student communication skills and her/his autonomy in the organization and exposure of the theoretical topics (4th Dublin descriptor).
The second part of the oral test consists of the discussion about 15 minutes long of a case study proposed by the Professor, consisting of a group design of structural elements. During the discussion the student will explain the issues raised by the assigned case and the possible design alternatives. She/he will also present and defend the basic principles guiding the proposed design and will describe the construction techniques. The examination, as a whole, allows to verify both the ability of knowledge and understanding, and the ability to apply the acquired skills and to display, learn and develop solutions for independent thinking.
The final mark will be evaluated by the Committee by assigning a maximum of 15 points to the written test and 15 points to the oral test. - Extended program
- 1. Actions on constructions with particular reference to bridges.
Introduction to bridge structures. Permanent actions, traffic loads on bridges, loads without external forces, static wind actions with notes on the theory of the atmospheric boundary layer, aerodynamic wind actions and aeroelastic wind effects (buffeting, vortex shedding, lock-in, vertical and torsional galloping, torsional divergence, flutter), seismic actions, fatigue.
2. Influence lines.
Definition, construction with direct method and construction with energy theorems of the Theory of Elasticity.
3. Steel-concrete composite structural elements
Generalities, plastic analysis of bending, plastic interaction between bending moment and shear, elastic analysis of bending, effects of concrete creep and shrinkage, notes on the theory of viscoelasticity, stresses induced by shrinkage, serviceability limit states, influence of construction stages, connection system and elements of the theory of statically indeterminate composite beams. Steel-concrete composite columns: technologies and analysis at the ULS.
4. Prestressed concrete beams
Prestressed concrete and post-tensioned concrete, prestress equivalent actions, losses of prestress (immediate losses, friction along the tendon, anchorage losses, shrinkage losses, creep losses, relaxation of steel). Notes on statically undetermined prestressed beams and construction details of prestressed concrete elements.
5. Two-dimensional structural elements
Reinforced concrete plates: first order elastic analysis and rebar position. Local actions on reinforced concrete plates and orthotropic steel plates. First order theory of curved shell structures (tubes). Girder bridges: definition, distribution coefficients, solution with classic methods (Courbon, Engesser, Guyon).