GTU Civil Engineering (Semester 6)
Earthquake Engineering
May 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 Calculate lateral forces in the critical direction at each floor level for a building of government office having building frame with following data by collector office seismic coefficient method. also draw lateral load distribution diagram & shear diagram.
(a) No. of storeys =5
(b) No. of bay of X & Y direction=7
(c) Storey height=3.5 m
(d) width of each bay in X & Y direction=6 m
(e) Size of beam=0.3 m × 0.45 m
(f) Size of column=0.45 m × 0.45 m
(g) Wall thickness =0.230 meter
(h) L.L.=4 KN/m2
(i) Location:- Gandhinagar
14 M

2 (a) i) What points should be kept in mind while designing earthquake resistant brick masonry structure?
4 M
2 (a) ii) Describe seismic waves in detail.
3 M
2 (b) Derive an equation for single degree undamped vibration system.
7 M
2 (c) Rigid frame shown in Fig.1, having infinitely rigid girder which is disturbed horizontally by initial condition of X0 =0, X0 =4 m/s, t=0.
(a)Find natural period and frequency
(b)The displacement and velocity at any time t.

7 M

3 (a) Explain base isolation techniques in details.
7 M
3 (b) Explain how 'Ductility of Building' can be effectively designed.
7 M
3 (c) i) Discuss Seismography and its applications.
4 M
3 (c) ii) Define: Focus, Epicenter and Foreshocks
3 M
3 (d) Explain how rigid diaphragm effect can be considered while analyzing buildings for seismic forces.
7 M

4 (a) A mobile tower is pulled by a steel cable by applying 35 kN force horizontally and displaced by 40 0 mm. The cable suddenly breaks and the resulting free vibration recorded. At the end of five cycles the time is 3.0 second and the amplitude is 30 mm . Determine damping ratio, natural period of an damped vibration, effective stiffness. , effective weight, and damping co-efficient.
7 M
4 (b) i) Short column effect and its implications in seismic design.
4 M
4 (b) ii) Strong column weak beam design.
3 M
4 (c) With Neat sketches discuss the concept of ductile detailing in columns.
7 M
4 (d) Analyze building shown in Fig. 2 and draw shear, bending and axial force diagrams.

7 M

5 (a) Draw neat sketches of 2 rigid jointed frames and 2 pin jointed trusses and find degrees of freedom for each.
7 M
5 (b) How does 'Elastic Rebound theory' play a role in design for seismic forces.
7 M
5 (c) What are the known causes of Earthquakes? Explain with neat sketches.
7 M
5 (d) Discuss flexural verses shear failure of Beam .
7 M



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