101703 BASICS OF DYNAMICS AND ASEISMIC DESIGN L T P C 3 0 0 3 OBJECTIVE: 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 TEXT BOOKS Chopra, A.K., “Dynamics of Structures – Theory and Applications to Earthquake Engineering”, Second Edition, Pearson Education, 2003. REFERENCES Biggs, J.M., “Introduction to Structural Dynamics”, McGraw–Hill Book Co., N.Y., 1964 Dowrick, D.J., “Earthquake Resistant Design”, John Wiley & Sons, London, 1977 Paz, M., “Structural Dynamics – Theory & Computation”, CSB Publishers & Distributors, Shahdara, Delhi, 1985 NPEEE Publications. 101704 PRESTRESSED CONCRETE STRUCTURE L T P C 3 0 0 3
OBJECTIVE
At the end of this course the student shall have a knowledge of methods of prestressing, advantages of prestressing concrete, the losses involved and the design methods for prestressed concrete elements under codal provisions.
UNIT I INTRODUCTION – THEORY AND BEHAVIOUR 9 Basic concepts – Advantages – Materials required – Systems and methods of prestressing – Analysis of sections – Stress concept – Strength concept – Load balancing concept – Effect of loading on the tensile stresses in tendons – Effect of tendon profile on deflections – Factors influencing deflections – Calculation of deflections – Short term and long term deflections  Losses of prestress – Estimation of crack width
UNIT II DESIGN CONCEPTS 9 Flexural strength – Simplified procedures as per codes – strain compatibility method – Basic concepts in selection of cross section for bending – stress distribution in end block, Design of anchorage zone reinforcement – Limit state design criteria – Partial prestressing – Applications.
UNIT III CIRCULAR PRESTRESSING 9 Design of prestressed concrete tanks – Pipes
UNIT IV COMPOSITE CONSTRUCTION 9 Analysis for stresses – Estimate for deflections – Flexural and shear strength of composite members
UNIT V PRESTRESSED CONCRETE BRIDGES 9 General aspects – pretensioned prestressed bridge decks – Post tensioned prestressed bridge decks – Principles of design only. TOTAL: 45 PERIODS TEXT BOOKS 1. Krishna Raju N., Prestressed concrete, Tata McGraw Hill Company, New Delhi 1998 2. Mallic S.K. and Gupta A.P., Prestressed concrete, Oxford and IBH publishing Co. Pvt. Ltd. 1997. 3. Rajagopalan, N, “Prestressed Concrete”, Alpha Science, 2002
REFERENCES 1. Ramaswamy G.S., Modern prestressed concrete design, Arnold Heinimen, New Delhi, 1990 2. Lin T.Y. Design of prestressed concrete structures, Asia Publishing House, Bombay 1995. 3. David A.Sheppard, William R. and Philips, Plant Cast precast and prestressed concrete – A design guide, McGraw Hill, New Delhi 1992.
