STUPIDSID
1 (a)
For a two storey Steel framed railway station building with concentric bracing and without infill wall, find the seismic base shear, using equivalent lateral load
method. Consider following data. (i) Location : Ahmedabad (ii) Soil condition :
Medium soil (iii) Plan dimensions : 3 bays of 4 m each along X direction and 4
bays of 3 m each along Y direction. The intensity of dead load including column,
beam and slab is 12 kN/m2 . Consider Live load on floor 3 kN/m2 . Consider 20 % damping. Height of floor is 3m.Also plot lateral load distribution diagram.
9 M
Answer following questions.
1 (b) 1
Define Resonance.
1 M
1 (b) 2
Evaluate with reason: For very stiff system PGA is equal to ZPA.
1 M
1 (b) 3
In which type of wave propagation volume of the medium changes but shape
does not change? Explain.
1 M
1 (b) 4
Give difference between accelerogram and accelerograph.
1 M
1 (b) 5
What are the basic elements of any mathematical model in Earthquake
engineering? Give the equation of forced damped vibration for SDOF system.
1 M
2 (a)
For a square column of size 400 mm × 400 mm work out the diameter of the
special confining hoop reinforcement as per IS:13920-1993. Take the concrete
grade M 25 and steel grade Fe 415. Clear cover to longitudinal reinforcement is
40 mm.
7 M
2 (b)
Derive the equation of damped free vibration of single degree of freedom system.
7 M
2 (c)
Define Logarithmic decrement, how it is measured and derive the equation of
Logarithmic decrement.
7 M
3 (a)
A two storey single bay RC frame is supported by four corner columns. Building is located in Surat has lumped floor weights of 200 kN & having storey stiffness 80 kN/m at every floor level. Perform free vibration analysis and determine all natural frequencies & sketch all mode shape
7 M
3 (b)
An acceleration response spectrum for SDOF system having 5% damping is shown in figure 1. Calculate maximum base shear and moment if the time period of the system is 0.5 sec. Take mass 8000 kg and height 4 m. What is the peak ground acceleration for this ground motion?
7 M
3 (c)
A spring mass model consists of 10 kg mass and spring with stiffness 7 N/mm,
was tested for viscous damped vibration. Test recorded two successive amplitudes
2and 1.5 Determine the natural frequency of undamped system, the logarithmic
decrement , damping ratio, damping coefficient, damped natural period.
7 M
3 (d)
Set up the equation of motion for the following damped SDOF system without
external force and solve for the response under given condition.
K=320 N/m, m=5kg, c=4N-s/m, x(0)=1 and [dot{x}](0)=7.6.
K=320 N/m, m=5kg, c=4N-s/m, x(0)=1 and [dot{x}](0)=7.6.
7 M
4 (a)
Explain earthquake resistant features of masonry structures.
7 M
Give difference between
4 (b) i)
Magnitude and intensity
4 M
4 (b) ii)
Soft storey and weak storey.
3 M
Write a short note
4 (c) i)
Types of waves.
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4 (c) ii)
Earth interior.
3 M
5 (a)
Analyze the three bay two storeys RC frame by Portal method. Lateral force of
200 kN & 120 kN is acting at first & second floor respectively. Height of first and
second storey is 4 m and 3 m respectively. Bay width of each bay is.4 m. Draw
axial force, shear force and bending moment diagram.
Write short note on liquefaction. Explain factors affecting liquefaction.
7 M
5 (b)
Write short note on liquefaction. Explain factors affecting liquefaction.
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Explain in detail
5 (c) i)
Rigid floor Diaphragm effect
4 M
5 (c) ii)
Torsionally coupled and uncoupled system
3 M
5 (d)
Enlist the different methods of structural control and explain any one in detail.
7 M
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