DSS implementation for bridge managment

Date (from - to) 07/01/2015 to 20/01/2015
Hours Number 60
Framework STRIT training
Task SK1 "Expert technician in risk assessment of major transport infrastructure." - Module A9
Organization STRESS s.c.a.r.l.
Featured activities Structural reliability, LCCA.
Course Schedule
Date (Hours Number) Topics
07/01/2015 (6 h)
  1. Course presentation.
    • General considerations, organization of lessons, exercises and method of examination.
    • Introductory overview on the topics.
  2. Description of the Italian bridges heritage.
    • Classification of the bridges on different bases (obstacle passed, road served, material, static scheme).
  3. Actions assessment on the bridges.
    • Standard actions: permanent loads, transit vehicles, wind load, load products from the obstacle passed (hydrodynamic forces, land forces, accidental knocks), fatigue.
    • Actions related to time: degradation of materials in time, shrinkage and creep of concrete, steel relaxation.
    • Seismic action.
08/01/2015 (6 h)
  1. Classification of the Italian legislation approaches (DM 14/01/2008 and Circular 617 of 02/02/2009).
    • Analytical methods provided and evaluation of structural safety for the bridges.
    • Concept of useful life and return period.
    • Evaluation of actions.
  2. Introduction to Bridge Managment through through the evaluation of the LCC.
    • Definition of the types of life cycle (physical, economic, functional, etc.).
    • Economic concepts (actual cost, discounted cost, discount factor).
    • Phases that characterize the management and analysis of a bridge.
  3. Considerations on bridge managment.
    • Importance of the study of the LCC for roads infrastructures.
    • Hypothesis, and optimization of the solution.
    • Sources of uncertainty and need for a probabilistic approach.
09/01/2015 (6 h)
  1. Basic concepts of probability.
    • Logical statements, basic rules, the concept of independence, variables mutually exclusive and collectively exhaustive.
    • Total probability theorem and Bayes' theorem.
  2. Distribution of probability and their statistics.
    • Discrete and continuous distributions, Probability Mass Function (PMF), Probability Density Function (PDF), Cumulative Mass Function (CMF), Cumulative Density Function (CDF), Complementary Cumulative Density Function (CCDF).
    • Fundamental probability distributions: Geometric, Poisson, Exponential, Normal, Log-Normal./li>
    • Statistics of probability distributions: median, mode, average, expected value, standard deviation.
  3. Exercises: probability distributions.
12/01/2015 (6 h)
  1. Linear regression.
    • Probabilistic model of linear regression, standard error of the regression, regression in the bi-logarithmic plan.
    • Various examples.
  2. Probabilistic and Seismic Hazard Analysis (PSHA)
    • Introduction to the concepts of hazard and seismic risk.
    • Measurements of seismic intensity.
    • Hazard curves and derivation of the uniform hazard spectrum.
    • Closed form expression of hazard curve (exponential) and the use of Italian code data.
  3. Exercises: regression and hazard curve determination.
13/01/2015 (6 h)
  1. Structural vulnerability.
    • Definition of fragility curve.
    • Procedures for make fragility curves using non-linear dynamic analysis: CLOUD and IDA.
    • Linear regression in the bi-logarithmic plan to calculate the fragility curves from data obtained from CLOUD analysis.
  2. Calculation of risk.
    • Rigorous methodology through the PEER formula
    • Closed form approach (SAC-FEMA 2000).
  3. Exercises: vulnerability and risk assessment.
14/01/2015 (6 h)
  1. Structural reliability.
    • Introduction to structural safety.
    • Definition of limite state function, failure probability and reliability index.
  2. Reliability assessment of structural elements.
    • Methods for structural reliability assessment. Definition of FORM, SORM and FOSM.
    • Structural reliability in the Italian code: LRFD.
    • Sources of uncertainties and alternative simulation-based methods. Importance sampling technique.
  3. Concepts of systemic reliability.
    • Properties of simple systems: series or parallel systems.
    • Composite systems: cutset, pathset.
    • Concept of weakest-link system.
  4. Exercises: structural reliability assessment.
15/01/2015 (6 h)
  1. Bridge managment: maintenance costs.
    • Description of maintenance costs, calculation of costs in closed form from the value of the mean annual cost.
    • Calculation of maintenance costs based on a database of maintenance performed.
  2. Bridge managment: the life cycle cost.
    • Calculation of life cycle cost profile given a certain maintenance profile.
    • Life cycle cost for a set of infrastructures, starting from different construction time and with an assigned maintenance profiles.
  3. Exercises: LCC assessment.
16/01/2015 (6 h)
  1. Bridge managment: maintenance programming.
    • Type of maintenance.
    • Reliability index and performance index.
    • Degradation laws of materials.
    • Calculation of the number of maintenances required (during the lifetime) in order to maintain an established reliability index.
    • Maintenance programming during the lifetime.
  2. Exercises: elaboration of maintenence programs.
19/01/2015 (6 h)
  1. General recap.
    • Bridges as critical infrastructure of the road network, life cycle costs and maintenance strategies.
    • Structural reliability, structural safety assessment, fragility curves.
    • Hazard curves and risk assessment.
  2. Exercise: complete management over time of a system of road infrastructures.
    • Problem definition and objectives.
    • Identification of a population of infrastructures.
    • State of the structures assessment, evaluation of life cycle cost and time schedule of maintenance.
20/01/2015 (6 h)
  • Final exam.
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