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STRUCTURAL MECHANICS I MODULE 2

CODE 72508
ACADEMIC YEAR 2022/2023
CREDITS
  • 12 cfu during the 2nd year of 8715 INGEGNERIA CIVILE E AMBIENTALE (L-7) - GENOVA
  • 12 cfu during the 2nd year of 8694 SCIENZE DELL'ARCHITETTURA (L-17) - GENOVA
  • SCIENTIFIC DISCIPLINARY SECTOR ICAR/08
    LANGUAGE Italian
    TEACHING LOCATION
  • GENOVA
  • SEMESTER 2° Semester
    PREREQUISITES
    Prerequisites
    You can take the exam for this unit if you passed the following exam(s):
    • Sciences of architecture 8694 (coorte 2021/2022)
    • MATHEMATICS 1 56394
    MODULES This unit is a module of:
    TEACHING MATERIALS AULAWEB

    AIMS AND CONTENT

    AIMS AND LEARNING OUTCOMES

    The course introduces students to the Solid Mechanics through the formulation of appropriate mathematical models able to simulate the real behavior of materials. Among these the simplest and most widely used is known as Cauchy continuum. Therefore, this course represents an introduction to the Mechanics of Materials (to use a terminology of English origin) which is fundamental in every field of Engineering, not only for Civil and Environmental Engineers. The main learning outcome of the course is to provide, in its first part, fundamentals on the analysis of tension, deformation and constitutive law of three-dimensional solids in the linear field (i.e., small displacements and displacement gradients). The second part of the course deals with a particular continuous model able to represent a continuous mono-dimensional beam type (i.e., the De Saint Venant model), whose solution allows to deal with all the stress cases present in the structural engineering problems. The strong connection with Module 1 is repeatedly underlined with simple examples. At the end of the course the students will be able to design and verify simple beams subject to stress not only of bi-dimensional but also of three-dimensional nature (as in the case of biaxial flexure and torsion).

    During the course the student must develop the following main skills as a result of the learning process:

    - physically interpreting deformation and stress states
    - determining principal deformations and stresses and their corresponding directions in both analytical and graphical approach
    - writing compatibility and equilibrium (balance) equations of the continuous body
    - using the constitutive law equations of isotropic linear elastic materials and write the potential elastic energy
    - to determine stress, strain and displacement fields deriving from different simple and compound stresses in the De Saint Venant continuous model: axial load, bending and biaxial flexure, combined bending and axial loading, torsion, transverse shear, combined torsion and shear stresses
    - graphically showing the stress fields determined
    - using approximate theories for the evaluation of uniform torsion in open and closed thin-walled sections
    - performing verifications of strength in the presence of multiaxial stress states
    - being able to deal with design and verification problems for simple beams

    TEACHING METHODS

    Lectures: on the blackboard using slide projections

    SYLLABUS/CONTENT

    The Cauchy continuum

      Deformation analysis
      Stress analysis
      Virtual Work Identity
      Constitutive law for isotropic material
      The elastic problem and the De Saint Venant principle

    The De Saint Venant problem

        Semi-inverse method
        General solution for normal stress
        Sub-problem 1: uniform extension
        Sub-problem 2: uniform bending
        Mixed problems (biaxial bending and eccentric normal force)
        Sub-problem 3: uniform torsion
        Sub-problem 4: non-uniform bending
        Mixed problems: transverse shear and torsion, shear center
        Notes on resistance criteria and equivalent (ideal) stress

    RECOMMENDED READING/BIBLIOGRAPHY

    Course notes available on Aulaweb

    Lecture videos available on Teams

    Nunziante, Gambarotta, Tralli - Scienza delle Costruzioni - McGraw Hll (capitoli 5 e 6)
    Luongo, Paolone - Scienza delle Costruzioni: Il continuo di Cauchy - Casa Editrice Ambrosiana (capitoli 1-6, 10)
    Casini, Vasta - Scienza delle Costruzioni - Città Studi Edizioni (capitoli 13-22, 24)

    TEACHERS AND EXAM BOARD

    Exam Board

    LUIGI GAMBAROTTA (President)

    ANDREA BACIGALUPO

    VITO DIANA

    GIUSEPPE PICCARDO (President Substitute)

    LESSONS

    Class schedule

    All class schedules are posted on the EasyAcademy portal.

    EXAMS

    EXAM DESCRIPTION

    The exam consists of a written and an oral test.

    Furthermore, during the Course, there will be two written tests on the first (Cauchy continuum) and the second part (DSV problem) of the Course. The students that will pass them, will be enabled to access directly the oral exam.

    ASSESSMENT METHODS

    The written test is based on the solution of some (2/3) problems similar to those dealt with during the course exercises, concerning the whole program of the course. The use of books or notes is allowed (open-book tests), but the use of electronic equipment of any kind (cell phones, tablets, laptops) is not permitted. The written tests are valid for the entire academic year in which they are taken. Students who have obtained a sufficient grade (usually equal to or greater than 18) in the written test are admitted to the oral exam. Handing in a test cancels the outcome of any previous written tests.

    The written partial tests proposed during the course (II semester), with an average grade approximately greater than 16 (with both tests having results higher than 7/30), replace the written test. The partial tests lose validity at the end of the Academic Year, until the start of the next course (around February). The topics of the partial tests concern the contents developed in the periods preceding the test itself and concern the first (Cauchy continuum) and the second part (DSV model solutions) of the course. Handing in a test cancels the outcome of the partial tests.

    The oral examination is aimed at verifying the acquisition of the concepts and analytical skills acquired by the student and the knowledge of the theoretical part of the program, as well as a possible discussion of the written test. To take the oral test it is necessary to have a valid written test and to be in compliance with the prerequisites. If the outcome of the oral test is not sufficient, it is possible to repeat the oral test ONLY ONCE keeping the written test valid but ONLY if the written test was passed with a mark higher than 18.

    The exams take place in Italian. The oral exam can be taken in English.

    Exam schedule

    Date Time Location Type Notes