Seismic Engineering Basis
Code
10733
Academic unit
Faculdade de Ciências e Tecnologia
Department
Departamento de Engenharia Civil
Credits
3.0
Teacher in charge
Ana Maria Carvalho Pinheiro Vieira, João Paulo Bilé Serra
Weekly hours
3
Teaching language
Português
Objectives
At the end of this course the successful students will be able:
a. To define earthquake mechanisms of tectonic origin;
b. To analyze the seismic surface motions defined by accelerograms;
c. To evaluate the seismic design action of structures based on national legislation and structural Eurocodes;
d. To analyze the seismic response of structures represented by means of one degree of freedom linear oscillators;
e. To evaluate dynamic soil properties by means of laboratory and in situ cylic testing;
f. To analyze the seismic response of surface soil deposits and thus evaluate the seismic site effects;
g. To analyze the effects of the deformability of the foundation ground in the response of soil deposits;
h. To evaluate soil liquefaction susceptibility;
i. To analyze the seismic response of earth dams by different methods.
Subject matter
Chapter 1. Seismic hazards. Earthquake Engineering. Impact of earthquakes on communities. Historical earthquakes. Historical and instrumental seismicity.
Chapter 2. Generation mechanisms of earthquakes. Internal structure of the earth. Origin of earthquakes. Theories of seismic mechanisms. Faults and earthquakes generation. Elastic rebound theory.
Chapter 3. Seismic waves. Focus. Epicentre. Epicentral distance. Associated movements. Geometric and mechanical dissipation.
Chapter 4. Characterization of ground motions in seismology. Earthquake moment. Earthquake magnitude. Scales of magnitude and intensity. Seismic moment.
Chapter 5. Strong-motion measurements. Amplitude parameters. Frequency content parameters. Fourier amplitude and phase spectra. Equation of motion of the linear oscillator 1 degree of freedom. Notion of transfer function. Modelling continuous systems. Response and power spectra.
Chapter 6. Identification and evaluation of earthquake sources. Probabilistic hazard analysis. Recurrence times of seismic events. Probability of exceedance. Attenuation relationships for seismic parameters.
Chapter 7. Regulation of Safety and Actions for Buildings and Bridges Structures and Eurocode 8 (design of structures for earthquake resistance).
Chapter 8. Influence of dynamic soil properties on earthquake surface ground motions (local site effects). Cyclic behaviour of soils. Measurement of dynamic soil properties. Linear hysteretic model. Curves of variation of shear modulus and damping ratio with cyclic distortion. Equivalent linear approach.
Chapter 9. One-dimensional shear wave ground response analysis. Kelvin-Voigt model. Ambraseys solutions. Modal decomposition. Combination of modal responses
Chapter 10. Soils’ liquefaction potential. Basic concepts. Liquefaction related phenomena. Methods of liquefaction assessment by means of SPT and CPT in situ soil testing (Eurocode 8).
Chapter 11. Dynamic behaviour of earth dams. Pseudo-static and analysis and Makdisi-Seed method.
Bibliography
[1] Kramer, Steven L. (1996). Geotechnical Earthquake Engineering. University of Washington. Prentice-Hall International Series in Civil Engineering and Engineering Mechanics.
[2] Day, Robert W. (2002). Geotechnical Earthquake Engineering Handbook., McGraw-Hill Handbooks.
[3] RSA (1983). Regulamento de Segurança e Acções para Estruturas de Edifícios e Pontes. Imprensa Nacional Casa da Moeda. Decreto-Lei 235/83.
[4] EN1998-1 (2010). Eurocódigo 8. Parte 1: Regras gerais, acções sísmicas e regras para edifícios. NP EN 1998-1.
[5] Ishihara, K (1996). Soil Behaviour in Earthquake Geotechnics, Clarendon Press, Oxford Engineering Science
Series
Evaluation method
1 - Continuos evaluation: 2 individual works (TIi )and 2 mini-tests (MTi) .
2 - Minitests: 75 duration each.
3 - Discipline attendance: individual works approval and attendance in 2/3 of theoretical/pratical classes. Attendace is valid for one year, being released students that in the previous year had successefuly attend the discipline, according to n.º 2, art.º 5.º Evalution Regulation of FCT.
4 - Final classification by continuos evaluation: NF=35% MT1 + 35% MT2 + 15% TI1 + 15% TI2. MTi and TIj values are rounded to the nearest tenth.
5 - Final classification by final exame: obtained by the classifications rounded to the nearest tenth of the exame (EX) and of the individual works (TIj) according to the expression NF=70% EX +15% TI1 + 15% TI2. : If EX < 9 the the student do not pass and NF=EX.
6 - Students that obtain a classification higher then 17 must perform an oral test for confirmation. In such case they will get the oral test classification. In case they choose not to do this, a final classification of 17 values will be assigned.