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Course organization

The course will be organized in eight lectures of two hours each and four tutorials, also with a duration of two hours. Two homework assignments will be presented during the tutorials. The students will have to hand in the assignments before the final exam.
The final grade will be based either on the grades obtained in the assignments and on the final exam.
English and Italian language may be used indifferently for lectures and tutorials.

Myths and fallacies in engineering structures

Programma

Course Outline

1. History of strength of materials (4 hours)
Greeks and Romans
XVII century – Galileo, Hooke, Mariotte, Euler and Lagrange
XVIII century – Coulomb, retaining walls, arches
XIX century – Navier, Cauchy, Poisson, Jourawski, Winkler
XIX century – De Saint-Venant, Mohr, Castigliano, Rayleigh

2. Understanding of earthquakes and dynamic actions (2 hours)
Ancient perceptions on earthquakes from the origin to the Age of Enlightenment
Robert Hooke and the theory of elasticity
Galileo, Newton and the law of inertia
Tectonics, waves, statistics and probability
Acceleration, velocity, displacement
• Hazard disaggregation
• EQ return period vs design life
• Code zonation vs site specific parameters
• Time dependent characterization of hazard
• Probabilistic vs deterministic characterization of hazard
• Acceleration, displacement and velocity as intensity parameters
Demand and capacity after the Messina earthquake
Early evaluation of ground acceleration and response spectra
Structural design, from elasticity to the discover of ductility
Strength demand in modern codes
Capacity design and detailing in modern codes
• Mechanism hierarchy
• Adjusting detailing to the level of inelastic deformation
• Probability aspects
• Detailing for actions exceeding the design level
• Simplified approaches
Displacement based design

3. Numerical modelling of structures (4 hours + 2 tutorials)
Stiffness based analysis
Equilibrium based analysis
Conceptual analysis
Static and dynamic analysis
Linear and non linear analysis
Structural stability
Lumped vs distributed parameter systems
Consideration and modelling of brittle failure modes
Finite elements

4. Structural testing (4 hours + 2 tutorials)
Laboratory testing
Field testing
Imposing loads and displacements
• Hydraulic actuators
• Screw jacks
Data acquisition
• Strain gauges
• Linear potentiometers
• Pressure transducers
• Load cells
• Accelerometers
• Seismometers
• Optical reading
Static and dynamic testing
Shake table testing
Pseudo–dynamic testing
Test control

5. Design philosophy in practice (2 hours)
Design life
Design intensity
Design performances and limit states
Design for damage control or avoidance
Simplifying structures
• From real structures to models
• From multi to single degree of freedom
Simplified design approaches
Correlation between protection and structural cost
Building structures
Bridges
Isolation and energy dissipation
Different standards for design and assessment
Assessment when details and material are known
Assessment approach when details are unknown
• Use of testing
• Use of design simulation
• Use of back analysis
Potential for step change in safety
Foundation assessment
Modification of damage and collapse mode
• Use of additional elements
• Local member strengthening
• Increasing local deformation capacity
• Reduction of displacement demand by added damping
• Introduction of base isolation
Policies for resources allocation, insurance policies, …

Teaching Assistants

Paola Ceresa
Ricardo Monteiro
Roberto Nascimbene
Francesco Lunghi

 

Svolgimento

Il corso si svolgerà dal 11 marzo al 3 aprile 2014 presso le Aule 1-15, 1-16 e 1-17 di Palazzo Broletto, come sotto riportato. N.B.: La lezione di mercoledì 2 aprile p.v. si terrà presso la Fondazione Eucentre.

Esame

Mercoledì 16 aprile p.v., ore 9.30, Aula 1-16

Ambito : Scienze e Tecnologie

Semestre: Semestre II

Anno accademico: 2013-2014