# INTRODUCTION TO STRUCTURAL MECHANICS

12 CFU - Annual Tuition

### Teaching Staff

FRANCESCO CANNIZZARO - Module Introduction to structural mechanics - Statics - ICAR/08 - 8 CFU
SILVIO CHERUBINI - Module MECHANICS - FIS/01 - 4 CFU

## Learning Objectives

• Introduction to structural mechanics - Statics

The module of Statics aims at delivering studens the basic knowledge of the mechanics of structures, in view of the future courses of Mechanics of Structures and Design of Structures.

In particular, as shown below in the contents of the course, after dealing with the basic topics regarding the equilibrium, the statics and kinematics of rigid bodies, several plane structural typologies subjected to forces were analyzed (beams, frames, articulated systems, arches).

Such structures will be classified, characterized on the basis of a kinematic analysis, and the reactions and the force on the structure will be obtained.

Finally, a part of the course will be devoted to topics which will be applied in future courses with reference to the stress and strain analyses. In particular, the geometric properties of plane figures will be inferred.

## Course Structure

• Introduction to structural mechanics - Statics

Classes (with the possibility to be attended remotely, according to the anti-covid rules) and tutor activities.Classes will be recorded and the possibility to rewatch them is allowed (depending on the anti-covid rules). Classes will be held with the help of a graphical tablet, and all the projected material will be provided to the students.

## Detailed Course Content

• Introduction to structural mechanics - Statics
1. Theory of vectors and grephic statics (see the website of the course and reference books)

Polygon of forces, decomposition of a force along two assigned directions, definition of moment, resultant force and moment of a system of forces, equivalent system of forces, central axis, funicular polygon.

2.Cardinal equations of the statics (see the website of the course and reference books)

Definition of rigid body; the principles of dynamics; equilibrium with respect to translation and rotation, graphic method, analytical and graphic applications.

3.Statics and kinematics of restrained rigid bodies (see the website of the course and reference books)

Definition of restraint; static and kinematic characterization of external restraints; kinematics of rigid bodies; absolute centre of rotation; statically determined, statically indetermined and ill-conditioned systems; graphic and analytical evaluation of reactions for statically determined rigid bodies, uniaxial problems, bi-dimensional problems, forces, indefinite equilibrium equations, static and kinematic characterization of internal restraints, articulated systems, internal reactions, equilibrium of articulated systems, graphic method, symmetric systems, kinematic analysis of articulated systems, virtual displacement, relative centre of rotation, kinematic chains, Chasles and Kennedy's theorems, static-kinematic duality, virtual work principle for rigid bodies, computation of reaction and forces with the virtual work principle, applications.

4.Statically determined structural typologies (see the website of the course and reference books)

Truss systems; node equilibrium method, Ritter's section method, il metodo dell’equilibrio ai nodi; il metodo della sezione di Ritter; Gerber beams, arches, physical reality and structural modelling.

5.Geometry of areas (see the website of the course and reference books)

Center of gravity of discrete and continuous systems, graphic and analytical assessment, static moment, moment of inertia, Huygens's theorem, principal axes of inertia, central ellipse of inertia, pole and anipole with respect to the central ellipse of inertial, central core or inertia, application to common sections.

## Textbook Information

• Introduction to structural mechanics - Statics

1) J.L. Meriam, L.G. Kraige Statics (7th edition), Wiley

2) A. Greco, Scienza delle Costruzioni, Aracne Editrice, 2012

3) E. Viola. Esercitazioni di scienza delle costruzioni – vol.1: strutture isostatiche e geometria delle masse. Pitagora, 1977.

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