Exam Details

Subject structural dynamics and earthquake engineering
Paper
Exam / Course me
Department
Organization Gujarat Technological University
Position
Exam Date May, 2017
City, State gujarat, ahmedabad


Question Paper

1/2
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
ME SEMESTER-II • EXAMINATION SUMMER 2017
Subject Code: 2722010 Date: 26/05/2017
Subject Name: Structural Dynamics and Earthquake Engineering
Time: 02:30 PM To 05:00 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 and IS 13920 1993 is permitted.
Q.1

State whether following statements are true or false also justify your answer in short.
06
Nagaland is having least seismic risk.
Inter storey drift is maximum in Zero Period Structure.
Design philosophy for gravity loads design philosophy for lateral loads due to earthquake are same.
Non structural wall will fail before structural wall.
If mass of SDOF system will become four times, then frequency will increase become doubled.
P S waves are responsible for maximum damage to structures.

Give details of expected damages by Earthquake in structures with
1. Short columns,
2. Building frames without shear panels,
3. Floating columns,
4. Unsymmetrical plan.
08
Q.2

Define Ductility. Explain concept of ductile detailing as per IS 13920 1993.Sketch ductile detailing for beam as per the code.
07

Calculate maximum SF and BM at supports for the frame shown in Fig.1 after five cycle of vibration if the floor is displaced horizontally by 80 mm and suddenly released. Take fck 20 MPa and 500 mm diameter column size. Assume suitable damping. Also draw amplitude envelop for first five cycles of vibration.
07
OR

Derive expression for the free vibration response of damped SDOF structural system and differentiate the response with that of free un-damped response.
07
Q.3

Derive expression for the response of SDOF forced damped structural system.
07

A vertical cantilever of mild steel tube section is 3.0 m long and supports 7 kN weight. The tube has external diameter 200 mm and wall thickness 5 mm. The system is subjected to a harmonic force of 12 kN amplitude and 2.5 Hz frequency find the maximum steady state displacement in the tube. Take damping as of critical damping.
07
OR
Q.3

Explain the effects of architectural features on performance of buildings during earthquake.
07

Explain the importance of provision of shear walls in seismic regions.
07
2/2
Q.4
For a two storied single bay steel residential building located in seismic zone V and resting on medium soil, calculate design lateral forces, storey shear and storey drift using response spectrum method of analysis as per IS:1893-2002. The structural elements of the building will be detailed as per IS:13920-1993. The mass on each floor is 1.5 tonne and story stiffness is 200 kN/m for both storey. Height of each floor is 3.2 m and bay width 5m.
14
OR
Q.4

Explain modal mass participation, and missing mass correction
07

Explain importance of bands in masonry buildings.
07
Q.5

A typical floor as shown in Figure 2 is subjected to design lateral force of 200 kN in X direction. Size of column is 450 mm x 650 mm and mass is uniformly distributed. Using appropriate clauses of code carry out lateral forces on the column.
07

Describe seismic waves briefly.
07
OR
Q.5

Explain the causes and remedial measures of liquefaction
07

Explain various methods of dynamic analysis. Explain Response Spectrum Analysis in detail.
07

6 m
A
B
D
C
Figure 1
F
E
6 m
6 m
20,000 kg
5 m
A
B
C
Figure 2
4 m
4 m


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