75460 - STRUCTURAL DIAGNOSTICS AND SEISMIC ASSESSMENT M

Anno Accademico 2021/2022

  • Docente: Nicola Buratti
  • Crediti formativi: 9
  • SSD: ICAR/09
  • Lingua di insegnamento: Inglese
  • Moduli: Nicola Buratti (Modulo 1) Nicola Buratti (Modulo 2) Camilla Colla (Modulo 3)
  • Modalità didattica: Convenzionale - Lezioni in presenza (Modulo 1) Convenzionale - Lezioni in presenza (Modulo 2) Convenzionale - Lezioni in presenza (Modulo 3)
  • Campus: Ravenna
  • Corso: Laurea Magistrale in Ingegneria dei processi e dei sistemi edilizi (cod. 8829)

Conoscenze e abilità da conseguire

At the end of the class, student has knowledge of the advanced concepts and tools for structural diagnosis, experimental testing and seismic assessment, with special attention for non-destructive techniques and in-situ structural assessment. In particular, at the end of the course he/she is able to assess historic structures, identify typical damage and conduct visual inspections, in situ investigation, non-destructive and slightly destructive techniques. In addition, he/she is able to carry out a seismic assessment, identify response spectrum analysis and damage and collapsing mechanisms in existing (particularly historical) structures.

Contenuti

The course comprises three modules:

  • module 1 and 2 concern the seismic assessment of masonry structures (6 CFU in total), they will be referred to as Seismic Assessment in the following.
  • module 3 concerns structural diagnostics techniques for masonry structures (3 CFU).

REQUIREMENTS

Fluent spoken and written English is a necessary prerequisite: all the lectures, tutorials, reference documents ad presentations will be in English.

Prior knowledge of construction materials and their forms of decay as well as of technology of historical constructions is required. Also, a prior knowledge and understanding of structural mechanics and of the mechanics of masonry structures is required to attend this course. These topics are covered in previous year courses and in the following courses:

  • Advanced Structural Mechanics M
  • Historic Masonry and Wood Structures M.

CONTENTS OF THE MODULI ON SEISMIC ASSESSMENT (6 CFU)

1. ENGINEERING SEISMOLOGY

a. Tectonics, faults, faulting mechanisms, earthquake recurrence, elastic rebound theory, magnitude measures, earthquake energy.

b. Accelerograms: recording, properties, basic intensity measures. Soil and topographic effects.

2. STRUCTURAL DYNAMICS OF SDOF SYSTEMS

a. Un-damped free vibrations;

b. Damped free vibrations;

c. Forced vibrations;

d. Response to a base acceleration: Duhamel integral and time-stepping procedures (Newmark method etc.).

3. RESPONSE SPECTRA

a. Acceleration, displacement, velocity, pseudo-acceleration and pseudo-velocity response spectra;

b. Ductility and constant ductility spectra .

4. SEISMIC HAZARD

a. Uniform hazard spectra.

b. Seismic Risk

5. STRUCTURAL DYNAMICS OF MDOF STRUCTURES

a. Mass, stiffness and damping matrixes;

b. Modal analysis of 2D structures;

c. Free vibration;

d. Response to ground acceleration;

e. Maximum response analysis (response spectrum analysis).

f. Damping models;

g. Modal combination rules: SRSS, CQC;

h. Analysis of 3D structures. Effects of regularity.

6. SEISMIC DESIGN FUNDAMENTALS

a. Performance based design: Definition of limit states and performance levels.

b. Design response spectra: behaviour factor;

c. Linear analysis methods;

d. Definition of masses and combination of seismic effects with the effects of other loads;

e. Capacity design fundamentals.

7. DESIGN OF MASONRY STRUCTURES

a. Design criteria for unreinforced masonry structures

8. SEISMIC VULNERABILITY OF EXISTING STRUCTURES

a. Behaviour of masonry elements under lateral loads

b. Analysis methods

c. Local failure modes.

d. Seismic vulnerability analysis of masonry structures

CONTENTS OF MODULE ON STRUCTURAL DIAGNOSTICS (3 CFU)

1. INTRODUCTION TO THE KNOWLEDGE PATH FOR DIAGNOSE OF HISTORIC CONSTRUCTIONS

a. context of the construction;

b. approach for visual inspection, identification of structural skeleton and construction details, vulnerabilities, materials, damage;

c. crack pattern survey and monitoring

2. IN-SITU EXPERIMENTAL TECHNIQUES

Experimental techniques for masonry state evaluations and determination of mechanical properties: in situ non-destructive, semi-destructive, destructive testing, image diagnostic NDTs.

a. investigations by IR thermography;

b. investigations by GPR radar;

c. measurement of mortar compressive strength using penetrometers;

d. measurement of masonry modulus of elasticity by sonic tests. Other uses of acoustic methods;

e. masonry local compressive stress measurement using single flat-jack;

f. masonry behaviour, compressive strength and elasticity modulus by double flat-jacks;

g. shear strength measurement using hydraulic jack or/and flat-jacks;

h. coring and sampling;

i. mentions to other in situ direct or indirect strength measurements (pull-out, diagonal compression in panels, …).

3. LABORATORY TESTING FROM SITE SAMPLING

a. optical monitoring for mechanical measurements;

b. tools and equipment for mechanical measurements;

c. units’ and masonry’ compressive strength and modulus of elasticity;

d. mortar’s double punch test;

e. mentions to other lab tests (splitting tensile strength using site cores, splitting tensile test on cores with mortar joint).

Testi/Bibliografia

    SEISMIC ASSESSMENT

    • Steven L. Kramer, Geotechnical Earthquake Engineering
    • C.A. Chopra, Dynamics of Structures: Theory and Applications to Earthquake Engineering, 1999
    • Tomazevic, Earthquake-Resistant Design of Masonry Buildings, ICP
    • Thomas Paulay and M. J. N. Priestley, Seismic Design of Reinforced Concrete and Masonry Buildings

    STRUCTURAL DIAGNOSTICS

    • V.M. Malhotra, N.J. Carino: “Handbook on Nondestructive Testing of Concrete”, CRC Press, USA, 2004.
    • M.J. Sansalone, W.B. Street: “Impact-echo”, Bullbrier Press, Ithaca, N.Y., 1997.
    • Other references will be pointed out to during the course.
    • In addition to personal research by students, other references will be pointed out to class during teaching course.

Metodi didattici

Cognitive and experiential learning. Theory lectures supported by powerpoint presentations and use of blackboard will be alternated with experiential lectures where learning methods include practical exercises and hands-on use of non-destructive equipment, lab demonstrations and site visits (when possible). Homework.

Modalità di verifica e valutazione dell'apprendimento

The final examination for the moduli on Seismic Assessment and for the modulus on Structural Diagnostics are independent. Students are allowed to take them in different sessions.

In each part, in order to obtain a passing grade, students are required to demonstrate a knowledge of the key concepts of the subjects, some ability for critical application, and a comprehensible use of technical language. A failing grade will be awarded if students show knowledge gaps in key-concepts of the subject, inappropriate use of language, and/or logic failures in the analysis of the subject. The final grade will be computed as the weighted average of the grades obtained in each part. o obtain a final passing grade, passing grades must be obtained in each of the two course parts (modules 1+2 and module 3).

Structural Diagnostics and Seismic Assessment M is part of the integrated course "LABORATORY OF STRUCTURAL DIAGNOSTICS AND REHABILITATION M C.I." (15 CFU). The final grad for the integrated course will be computed as the weighted average of the grades of Seismic Assessment (6 CFU), of Structural Diagnostics (3 CFU) and of Structural Strengthening and rehabilitation M (6 CFU). Structural Strengthening and rehabilitation M is given during the second semester.

Seismic Assessment grade and exam

The final grade for Seismic Assessment is defined as follows:

25% Homework + 75% Final exam

Homework

During the course one homework assignment will be given to students, it aims at assessing the following skills:

  • definition of elastic and design response spectra based on Eurocode 8 and Italian code Rules
  • application of standard seismic analysis methods on simple masonry structures
  • seismic verification of existing masonry structures.

The homework assignment must be completed and submitted in order to sit for the final examination. Deadlines are set for each final exam date and reported on Almaesami.

Final Exam

The final exam for "Seismic Assessment" is a closed-book written examination. This exam is based on either two or three open questions, aimed at evaluating the knowledge of the key concepts discussed during the course as well as their critical understanding. The duration of the final exam is between 1 hour and 1.5 hours.

Structural Diagnostics exam

Homework

During the course, a homework can be assigned to students, who will be instructed if working on the assignment alone, in pairs or small groups. Homework could vary for different groups of students and it can vary in different academic years. The homework aims at gaining some practical experience of phenomena or some skills in inspection and survey or data analysis procedure. The homework assignment – which may involve presentation to class by students - must be completed and submitted during the semester, within the deadline(s) indicated by teacher.

Final Exam

Structural Diagnostics achievements are assessed via a final oral exam (including homework. Exam duration between half an hour and 1 hour approximately) aimed at evaluating the knowledge of the concepts and procedures discussed during the teaching module as well as their critical understanding.

 

Strumenti a supporto della didattica

Oral lectures with powerpont presentations. Blackboard. Computer lab. Demonstrations. Lab visit. Site visits. Application examples.

Orario di ricevimento

Consulta il sito web di Nicola Buratti

Consulta il sito web di Camilla Colla

SDGs

Città e comunità sostenibili

L'insegnamento contribuisce al perseguimento degli Obiettivi di Sviluppo Sostenibile dell'Agenda 2030 dell'ONU.