ANNA UNIVERSITY, CHENNAI-
R - 2008
-B.E. CIVIL ENGINEERING
CE 2403 BASICS OF DYNAMICS AND ASEISMIC DESIGN L T P C
3 0 0 3
The main objective of this course is to introduce to the student the phenomena of earthquakes, the process, measurements and the factors that affect the design of structures in seismic areas. This objective is achieved through imparting rudiments of theory of vibrations necessary to understand and analyse the dynamic forces caused by earthquakes and structures. Further, the student is also taught the codal provisions as well as the aseismic design methodology.
UNIT I THEORY OF VIBRATIONS 9
Concept of inertia and damping – Types of Damping – Difference between static forces and dynamic excitation – Degrees of freedom – SDOF idealisation – Equations of motion of SDOF system for mass as well as base excitation – Free vibration of SDOF system – Response to harmonic excitation – Impulse and response to unit impulse – Duhamel integral
UNIT II MULTIPLE DEGREE OF FREEDOM SYSTEM 9
Two degree of freedom system – Normal modes of vibration – Natural frequencies - Mode shapes - Introduction to MDOF systems – Decoupling of equations of motion – Concept of mode superposition (No derivations).
UNIT III ELEMENTS OF SEISMOLOGY 9
Causes of Earthquake – Geological faults – Tectonic plate theory – Elastic rebound – Epicentre
– Hypocentre – Primary, shear and Raleigh waves – Seismogram – Magnitude and intensity of earthquakes – Magnitude and Intensity scales – Spectral Acceleration - Information on some disastrous earthquakes
UNIT IV RESPONSE OF STRUCTURES TO EARTHQUAKE 9
Response and design spectra – Design earthquake – concept of peak acceleration – Site specific response spectrum – Effect of soil properties and damping – Liquefaction of soils – Importance of ductility – Methods of introducing ductility into RC structures.
UNIT V DESIGN METHODOLOGY 9
IS 1893, IS 13920 and IS 4326 – Codal provisions – Design as per the codes – Base isolation techniques – Vibration control measures – Important points in mitigating effects of earthquake on structures.
TOTAL: 45 PERIODS
1. Chopra, A.K., "Dynamics of Structures – Theory and Applications to Earthquake
Engineering", Second Edition, Pearson Education, 2003.
1. Biggs, J.M., "Introduction to Structural Dynamics", McGraw–Hill Book Co., N.Y., 1964
2. Dowrick, D.J., "Earthquake Resistant Design", John Wiley & Sons, London, 1977
3. Paz, M., "Structural Dynamics – Theory & Computation", CSB Publishers & Distributors, Shahdara, Delhi, 1985
4. NPEEE Publications.