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Subject Code: 160605
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (Old) EXAMINATION - WINTER 2019
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Subject Name: Earthquake Engineering
Time: 02:30 PM TO 05:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- IS 13920, IS 1893 and IS 4326 are permitted.
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Q.1 (a) Define following terms: [07]
- Natural Frequency
- Vibration
- Resonance
- Oscillation
- Damping
- Static Load
- Dynamic Magnification Factor
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(b) Write short note on Logarithmic Decrement. [07]
Q.2 (a) Derive the equation of undamped free vibration of single degree of freedom system. [07]
(b) A spring mass model consists of 5 kg mass and spring of stiffness 5 N/mm was tested for viscous damped vibration. The test recorded two consecutive amplitude is 1.0 cm and 0.85 cm respectively. Determine (i) Natural frequency of un-damped system (ii) Logarithmic decrement (iii) Damping ratio (iv) Damping coefficient (v) Damped natural frequency of system. [07]
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OR
(b) A vertical cantilever of mild steel tube section is 2.5 m long and supports 5.0 kN weight at top. The tube has 250 mm external diameter and 5 mm wall thickness. The system is subjected to a horizontal harmonic force of 1.0 kN amplitude and 4 Hz frequency at top. Find the maximum steady state displacement and bending stress in the tube. Take damping 5% of the critical. [07]
Q.3 (a) Define degree of freedom. Explain in detail the types of degree of freedom with example and sketch. [07]
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(b) Write short note on liquefaction. Explain factors affecting liquefaction. [07]
OR
Q.3 (a) Enlist the different methods of structural control and explain any one in detail. [07]
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(b) Define ductility. Explain the importance of ductility and types of ductility. [07]
Q.4 (a) Explain various bands and vertical reinforcements for earthquake resistant masonry structures. [07]
(b) Define following terms: [07]
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- Focus
- Epicenter
- Aftershock
- Accelerometer
- Focal Depth
- Seismic Zone
- Seismograph
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OR
Q.4 (a) Write a short note on seismic waves. [07]
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(b) Explain elastic rebound theory in detail. [07]
Q.5 (a) Explain the Rigid Diaphragm Effect with sketch. [07]
(b) Explain four virtues of earthquake resistant design. [07]
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OR
Q.5 (a) Explain the effect of irregularities on performance of RC Buildings with sketch. [07]
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(b) Explain the step wise procedure to find the base shear of multi-storey building with seismic coefficient method with codal provisions. [07]
Date: 06/12/2019
Total Marks: 70
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