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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-V EXAMINATION WINTER 2018
Subject Code:X50602 Date: 16/11/2018
Subject Name: Earthquake Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
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, IS 13920-1993 IS 4326-1993 is permitted.
Q.1

Evaluate the statement as True False and Justify the same.
I. Damages due to earthquakes are always allowed in Structures.
II. Strong beam weak column theory is preferred in earthquake engineering.
III. The number of intraplate earthquakes in world is more than inter-plate earthquakes.
IV. Combination of S&L waves is most dangerous.
V. Intensity scale XI is highest scale.
VI. Damping should be considered in dynamic analysis of structures.
VII. A building is located in the boundary of zone III IV. It will be designed as per zone III criteria.
07

What is mathematical modeling? Explain the concept with appropriate examples. Also write assumptions made in it.
07
Q.2

Derive the equation of response of single degree free damped vibration system.
07

A vibrating system consist of mass 5 kg and spring stiffness of 3700 N/m is viscously damped so that the ratio of two successive amplitude is 1.0 to 0.8. Determine: Natural frequency of damped Undamped vibration the logarithmic decrement damping ratio damping constant.
07
OR

Determine the magnification factor of forced vibration produced by an oscillator fixed at the middle of beam having speed of 550 RPM. The weight concentrated at the middle of beam is W 4500 N and produce static deflection of 2.3X10-4 m. neglect the weight of beam and take C 19 N-S/mm.
07
Q.3

A four storey building has size of 25 m x 25 m. it is located in Ahmedabad and
resting on hard soil. The weights of the floors are 1000 KN, 1500 KN, 1500KN
and 1200 KN and height of each floor is 3.2 m respectively from slab no 1 from bottom. Calculate the Base Shear by static coefficient method. Assume the building as ordinary moment resisting office building. Take damping 5%.
07

For Calculate lateral forces at each floor level. Also draw distribution of
lateral force at each floor level.
07
OR
Q.3

For the two-storey building having both lumped masses as m1=m2 20000 kg and having storey stiffness k1=60 kN/m k2= 90 kN/m. Perform free vibration analysis and draw all mode shapes.
14
Q.4

Explain step by step procedure of any one approximate analysis method for the structural portal frame.
07

Explain the earthquake resistance feature of masonary structures.
07
OR
Q.4

Explain the concept of base isolation technique in detail.
07

Explain ductile detailing of column as per IS 13920 1993. Also give limitation of this code.
07
2
Q.5

Explain Rigid diaphragm effect. Also give difference between center of mass Center of stiffness.
07

Differentiate between: Magnitude Intensity Soft Week storey
07
OR
Q.5

Define liquefaction and explain the causes and remedial measures of liquefaction.
07

Explain Seismic design philosophy capacity design concept.
07