Download GTU BE/B.Tech 2019 Winter 7th Sem New 2170612 Earthquake Engineering Question Paper

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Subject Code: 2170612

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of IS 1893 — 2002 and IS 13920 — 1993 is permitted.

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1. 1. Differentiate between magnitude and intensity [03]
   2. Describe seismic waves briefly. [04]
   3. Define liquefaction and explain the causes and remedial measures of liquefaction. [07]
2. 1. Define and explain pounding effect [03]

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   2. Explain Time History Analysis method [04]
   3. Explain importance of various bands in masonry buildings? [07]

   OR

   1. Find the natural frequency of the system shown in the fig.1. [07]

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3. 1. Define the terms — 1. Focus 2. Base shear 3. Magnitude of Earthquake [03]
   2. Describe importance of shear wall in multistoried Buildings [04]
   3. Explain ductile detailings of Beam as per IS 13920 [07]

   OR

   1. Differentiate between inter plate and intra plate earthquake [03]

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   2. Elaborate elastic rebound theory [04]
   3. Describe base isolation technique [07]
4. 1. Explain PGA. [03]
   2. Describe the codal provisions for vertical reinforcement in masonry walls [04]

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   3. Discuss the expected damages by Earthquake in structures having
      1) Unsymmetrical plan ii) Floating columns iii) Soft storey
      iv) Building frames without shear panels v) Short Column [07]

   OR

   1. List assumptions made in Portal frame method of lateral load analysis [03]

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   2. Briefly explain four virtues of earthquake resistant design [04]
   3. A spring mass model consisting of 9 kg mass and a spring having stiffness 3.6 N/mm was tested for viscous damped vibration and the test record showed two successive amplitudes as 1.75 and 1.5. Determine
      1. Natural frequency of Undamped System 2. Logarithmic Decrement
      3. Damping ratio 4. Damping coefficient and 5. Damped natural period [07]

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5. 1. A three story building frame with uniform floor height of 4m is having lumped masses of 5 tonns, 6 tonns and 4 tonns at first, second and third floor respectively with uniform storey stiffness of 1000 kN/m at each floor. Calculate natural frequency and corresponding mode shapes for the fundamental mode only. Also draw mode shapes. [14]

   OR

   1. Determine the shear force distribution in each story of a four story building located in a city of earthquake Zone — V, using seismic coefficient method for the following data:
      1. No. of bays in X — direction - 9
      2. No. of bays in Y — direction - 7
      

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      3. Bay width in both direction — 4 m
      4. Clear Story height below beam bottom — 3 m
      5. Thickness of Slab - 140 mm
      6. Size of web of Beam - 230 mm x 460 mm
      7. Size of Column - 460 mm x 600 mm
      

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      8. Internal wall thickness - 120 mm
      9. External wall thickness - 250 mm
      10. Live Load - 4 kN/m²
      Assume suitable data if required. Give your calculation with appropriate clause number of code and draw shear distribution at each floor level. [14]

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