72756 - Advanced Design Of Structures

Academic Year 2015/2016

  • Moduli: Claudio Mazzotti (Modulo 1) Stefano Silvestri (Modulo 2) Claudio Mazzotti (Modulo 3)
  • Teaching Mode: Traditional lectures (Modulo 1) Traditional lectures (Modulo 2) Traditional lectures (Modulo 3)
  • Campus: Bologna
  • Corso: Second cycle degree programme (LM) in Civil Engineering (cod. 8895)

Learning outcomes

Advanced methods for the verification and design of concrete structures will be given. The methods are based on the mechanics and simplified models for one- and two-dimensional concrete 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.

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.

 

Part 2 (Prof. 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

Notes from the classes (in progress).

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.

The assesment procedure will clarify if the student acquired a sufficient number of the originally predicted learning outcomes.

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