EARTHQUAKE ENGINEERING
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- Versione italiana
- Academic year
- 2022/2023
- Teacher
- ALESSANDRA APRILE
- Credits
- 9
- Curriculum
- COSTRUZIONI
- Didactic period
- Primo Semestre
- SSD
- ICAR/09
Training objectives
- The course provides basic tools for the design and safety checks of civil structures built in seismic zones. The design approach is developed as part of the national legislation in force, with reference to the broader context of the Eurocodes.
The main knowledge will be gained on the following topics:
Regional seismic risk and conventional design seismic force;
Methods of static and dynamic structural analysis, both linear and non-linear;
Architectural and structural conceptual design of earthquake-resistant structures;
Conventional design criteria of earthquake-resistant structures, with particular reference to steel and reinforced concrete (RC) structures;
Methods of assessment of the seismic vulnerability of existing buildings;
Overview of non-conventional methods of intervention for the seismic retrofit of existing buildings.
The main acquired skills or, in other words, the ability to apply the gained knowledge will be:
To check the structural safety of a new or existing building subjected to seismic action;
To design a new earthquake-resistant building with steel or reinforced concrete structure;
To assess the seismic vulnerability of an existing construction and outline possible strategies of the structural retrofit. Prerequisites
- The course requires the following basic knowledge:
Methods for structural safety evaluation; Non-linear analysis of structures; Numerical methods for structural analysis; Design of steel and reinforced structures for non-seismic actions. Course programme
- The course provides 90 hours of lessons, of which 60 hours of lectures and 30 of training on the following topics:
SEISMIC RESPONSE OF ELASTIC STRUCTURAL SYSTEMS (20 hours). Simple oscillator subject to seismic excitation. Integration of the equations of motion Elastic response spectra according to Housner’s definition and according to the National and European legislation. Structural systems with multiple degrees of freedom with proportional damping subjected to generic and seismic actions. Classical modal analysis and response spectrum method. Concept of activated modal mass. Simplified modal analysis. Example: modal analysis and simplified analysis of a 2D shear type frame with three floors. Torsional effects of space structural systems. Example: modal analysis and simplified analysis to a single-storey 3D frame. Concept of structural regularity. Conventional analysis of torsional effects.
SEISMIC RESPONSE OF INELASTIC STRUCTURAL SYSTEMS (20 hours). Structural ductility. Connotation and distribution of dissipative zones. Inelastic response spectrum. Spectral reduction factor, behavior factor and structural redundancy. Design spectra in the Ultimate Limit State (ULS) and Damage Limit State (DLS) according to National and European legislation. Combination of the seismic action with other actions. Displacements evaluation. Required checks in the ULS and DLS. Vulnerability assessment of existing buildings.
DESIGN OF EARTHQUAKE RESISTANT BUILDINGS (20 hours). Basic principles of conceptual design. Qualitative analysis of complex structural systems: in-plane and space frames, masonry infilled frames, braced frames, simple and coupled walls. Performance-based design and strength hierarchy principle. Ductility classes and structural regularity. Design of steel and reinforced concrete frames. Design criteria for high and low ductility classes, joints and detailing. Design of dissipative braces. Design of single and coupled reinforced concrete walls. Design criteria for coupling beams and detailing.
TRAINIG (30 hours). Seismic vulnerability assessment of an existing building with steel or reinforced concrete structure. Execution of linear dynamic analysis with conventional response spectrum by using a commercial code of finite element numerical analysis. Didactic methods
- The course consists of lectures and training. Lectures deal with the basic knowledge of the seismic engineering. Training deals with the seismic vulnerability assessment of an existing construction. It is a real case study assigned by the teacher to small groups of 2 or 3 students.
Learning assessment procedures
- The purpose of the final examination is to assess the competence reached by the student in the learning objectives described above. The final examination consists of two tests:
1) Test of the acquired skills through the presentation and discussion of the project developed during the training.
2) Test of the acquired knowledge through the oral discussion of three topics covered during the course and their logical connections.
The two test results are evaluated with marks within the range of 18 to 30 of 30 and the final grade is calculated as the average of the two. In any case, it is requested to reach a mark higher than 18 to 30 in both tests. Reference texts
- Clough R.W., Penzien J. Dynamics of Structures. Mc Graw Hill, 1995.
Pozzati P., Teoria e Tecnica delle Strutture, UTET. 1986.
Petrini L, Pinho R., Calvi G.M., Criteri di progettazione antisismica degli edifici, IUSS PRESS. 2004.
Cosenza E., Maddaloni G., Magliulo G., Pecce M., Ramasco R. Progetto Antisismico di Edifici in Cemento Armato. IUSS PRESS. 2006.
Mazzolani F.M., Landolfo R., Della Corte G., Faggiano B. Edifici con Struttura di Acciaio in Zona Sismica. IUSS PRESS. 2006.
Manfredi G., Masi A., Pinho R., Verderame G., Vona M. Valutazione degli edifici esistenti in Cemento Armato. IUSS PRESS. 2007.
Wakabayashi M., Design of earthquake resistant buildings, Mc Graw Hill. 1989.
Gioncu V., Mazzolani F.M., Ductility of Seismic Resistant Steel Structures, Spon Press. 2002.
Paulay T., Priestley M.J.N., Seismic Design of Reinforced Concrete and Masonry Structures, John Wiley & Sons. 2002.
Decreto Ministeriale 17 gennaio 2018 - Aggiornamento delle «Norme tecniche per le costruzioni» di cui al D.M. 17.01.2018.
Circolare C.S.LL.PP. del 21 gennaio 2019, n. 7 - Istruzioni per l’applicazione dell’«Aggiornamento delle “Nuove norme tecniche per le costruzioni”» di cui al decreto ministeriale 17.01.2018.
UNI EN 1998-1- Eurocode 8: Design of structures for earthquake resistance -Part 1 : General rules, seismic actions and rules for buildings
UNI EN 1998-3 - Eurocode 8: Design of structures for earthquake resistance - Part 3: Assessment and retrofitting of buildings
