- Docente: Claudio Mazzotti
- Credits: 9
- SSD: ICAR/09
- Language: English
- Moduli: Claudio Mazzotti (Modulo 1) Stefano Silvestri (Modulo 2)
- Teaching Mode: Traditional lectures (Modulo 1) Traditional lectures (Modulo 2)
- Campus: Bologna
- Corso: Second cycle degree programme (LM) in Civil Engineering (cod. 8211)
Learning outcomes
Advanced methods for the verification and design of structures
will be given. The methods are based on the mechanics and
simplified models for one- and two-dimensional structures. A
variety of civil engineering structures will be analysed. The
advanced methods will be used to solve some real problems, with
reference to European and US Codes and Guide Lines. The students
will design some one- and two-dimensional structures under the
supervision of the teacher. The course is divided into two teaching
units mainly focusing on concrete and steel structures,
respectively.
Course contents
The course is divided into two teaching units: the first one, with
6 credits, is mainly focused on the designing of reinforced
concrete structures while the second one refers to the design of
steel structures and prestressed RC elements.
Part 1 (Prof. Mazzotti)
1. Design of RC frame structures
Verification and design rules for RC sections under axial-bending loads according to the ultimate limit state method. Verification and design rules against shear and torsion. Provisions by European and American Guide Lines (Eurocodes and ACI).
2. Ductility of RC structures
Moment-curvature diagrams, tri-linear and bi-linear approximations. Ductility of RC sections under bending. Plastic hinge and admissible plastic rotation for RC elements under bending, Eurocode and ACI criteria. Influence of axial force. Examples. Ductility at sectional and structural scales.
3. Serviceability limit states of RC beams
Evolution of cracking phenomenon for RC elements under tensile axial force. Moment-curvature diagrams in cracked range. Crack width and deformability of beams in cracker range. Approximate formulas and normative requirements. Delayed deformation for concrete (shrinkage and creep). Theory of linear viscoelasticity. Creep and relaxation functions. The ageing phenomenon, CEB, ACI methods, Italian codes. Algebraic methods (EM, MS, AAEM methods). Problems concerning structures subject to delayed deformation. Principles of linear viscoelasticity. Numerical examples.
4. RC plates subject to in-plane loadings
Theory of elasticity (fundamentals), plane stress and plane strain states. Simplified methods. RC High beams: cracker range and failure modes, high beams with multiple supports. Design criteria and details. Suspended loads.
5. RC plates under transverse loads
Kirchhoff plate theory: Lagrange equations and boundary conditions. Simply-supported and clamped plates. RC plate structures: design criteria and details. RC slabs over columns: approximate methods for calculation of internal actions, design rules and details. Verification against punching.
6. Shell structures:
Slabs of revolution . Membrane of revolution. Examples for slabs and membranes. Cylindrical r.c. tank. Prestressed tanks. Spherical membrane. Semi-spherical membrane. Conical membrane. Displacements and deformations of membranes. Foundation hoop. Spheric dome: Geckeler solution.
7. Instability of RC structures
The model column method. The equilibrium state method. M-N interaction diagrams with II order effects. The effect of delayed deformations. The case of precast structures. CNR 10025 Design Guidelines and International GuideLines. Foundations for precast structures: Design criteria and construction details.
Part 2 (Dr. Silvestri)
GENERAL CONSIDERATIONS
- the design process and the role of the structural engineer
- the framework of the current technical codes (Italian codes and Eurocodes, USA specifications).
- basis of design: safety-checking formats (i.e. verification methods)
- materials
CONCEPTUAL DESIGN OF STRUCTURES
- loads path to the ground
- vertical-resisting systems
- horizontal-resisting systems (bracing systems, shear wall systems, pendular systems and moment-resisting frames).
- multi-storey steel building structures
- detailed analysis of a n-storey braced frame structure
DESIGN OF STEEL STRUCTURES
- serviceability limit states
- ultimate strengths (axial force, bending moment, shear, combined actions)
- buckling (axially loaded compression members, lateral-torsional buckling for beams, buckling for bending and axial force)
- brief notes about buckling of frames and second-order analysis methods
DESIGN OF COMPOSITE STRUCTURES
- idea
- composite beams (moment capacities, shear capacities, shear transfer and strength of shear connectors)
- composite columns
DESIGN OF PRESTRESSED CONCRETE STRUCTURES
- history, development and general principles of prestressed concrete structures
- prestressing systems
- determination of the internal forces
- traction (in order to understand the behaviour)
- flexure
- shear
- loss of prestress
- end anchorages and local verifications
Readings/Bibliography
Lesson Notes prepared by the theacher (under preparation).
Pozzati P. e Ceccoli C., Teoria e Tecnica delle strutture, ed. UTET, Torino, vol. II (1977).
Belluzzi O., Scienza delle costruzioni, ed. Zanichelli, Bologna, voll. II e III.
Leonhardt F., c.a. & c.a.p.: calcolo di progetto & tecniche costruttive. Edizioni Tecniche, Milano, voll. I-III, 1977.
Migliacci A., Progetto agli stati limite delle strutture in c.a., Masson Italia Ed., Milano, 1977.
Migliacci A., Progetti di strutture, Tamburini, Milano, 1968.
Cosenza E. e Greco C., Il calcolo delle deformazioni nelle strutture in cemento armato. CUEN, Napoli, 1996.
- E. Giangreco,
“Ingegneria delle strutture”, UTET
- E. Torroja, “La concezione strutturale”, UTET
- J. Heyman, 1998, “Structural analysis. A historical approach”,
Cambridge University Press
- G. Ballio, F.M. Mazzolani, “Strutture in acciaio”, Hoepli.
- G. Ballio, C. Bernuzzi, 2004, “Progettare costruzioni in
acciaio”, Hoepli.
- N. Scibilia, 2005, “Progetto di strutture in acciaio”, 4° ed.,
Dario Flaccovio Editore.
- V. Nunziata, 2000, “Teoria e pratica delle strutture in acciaio”,
2° ed., Dario Flaccovio Editore.
- F. Hart, W. Henn, H. Sontag, 1982, “Architettura Acciaio Edifici
Civili”, 2° ed., FINSIDER Gruppo IRI (edizione FINSIDER in lingua
italiana del volume “Stahlbauatlas-Geschossbauten”, 2° ed.,
pubblicato dall'Institut für Internationale
Architektur-Dokumentation di Monaco).
- J.C. McCormac, 2008, "Structrual steel design", Pearson Prentice
Hall
- J.C. Smith, 1996, "Structrual steel design. LRFD approach",
Wiley
- S.P. Timoshenko, J.M. Gere, 1961, "Theory of elastic stability",
Dover publications
- T.V. Galambos, A.E. Surovek, 2008, "Structrual stability of
steel", Wiley
- T.Y. Lin, N.H. Burns, 1982, "Design of prestressed concrete
structures", Wiley
- R. Walther, M.Miehlbradt, 1990, "Progettare in calcestruzzo
armato", Hoepli
- C. Cestelli-Guidi, 1987, "Cemento armato precompresso",
Hoepli
- L. Santarella, 1998, "Il cemento armato", 22a ediz., Hoepli
- L. Goffi, P. Marro, 1998, "Appuni sul Cemento armato
precompresso", CLUT editrice, Torino
From the technic-scientific book series for the design of steel structures by ITALSIDER:
- L.F. Donato, L. Sanpaolesi, 1970, “Gli acciai e la sicurezza
delle costruzioni”, Volume I.
- L. Finzi, E. Nova, 1971, “Elementi strutturali”, Volume IV.
- D. Danieli, F. De Miranda, 1971, “Strutture in acciaio per
l'edilizia civile e industriale”, Volume VI.
Teaching methods
In regular classes, problems concerning the modelling and the design of reinforced concrete structures are discussed. Finally, details of nodes, steel positioning, etc. will be shown and discussed. Guidelines for different structural problems reported in national and international codes will be considered. Some classes will be devoted to show designs of actual realizations concerning the subjects of regular classes.
Assessment methods
Each didactic unit has its own final verification.
6 CFU Unit: Final verification will be given according to a written test and an oral colloquium where the verification of the ability of the student to consider the main theoretical aspects of the course will be controlled.
3 CFU Unit: Verification of the individual homeworks (assigned during the course) and final oral test.
Teaching tools
Blackboard, overhead projector, video projector
Links to further information
http://corsi.unibo.it/Civil-Engineering/Pages/default.aspx
Office hours
See the website of Claudio Mazzotti
See the website of Stefano Silvestri