06cv834USN

Eighth Semester B.E. Degree Examination, June/July 2011Earthquake Resistant Design of Structures

Time:3 hrs. Max. Marks:100Note: 1. Answer FIYEfull questions selecting

at least TWO questions from each part.2. Assume any missing dato if anY.3. Use of only IS-1893

-

2002 is permitted.

PART -

AI a. Explain with sketches, details of different types of seismic waves and their propagation.

(10 Marks)b. Explain seismic zoning map of India. With specific reference to

i) Background and bases on which the seismic zone is done.ii) Use of seismic zoning in computation of seismic forces and zone factors for prominent

areas. (r0 Marks)

2 a. Explain strong motion characteristics and how they affect the structural response. (10 Marks)b. Explain principles of seismic instrumentation to measure seismic waves. (10 Marks)

3 a. Explain the acceleration response spectrum of IS-1893 giving in details the factors on whichthe response acceleration depends. (10 Marks)

b. What are the methods to control or modifu the structural response to seismic activity?Elaborate any one of them. (r0 Marks)

4 a. Explain vertical irregularities in general and soft storey in particular with reference toearthquake resistance. What are special provisions of design of buildings with soft storey?

(10 Marks)b. What are different lateral load resisting systems in building structure? Explain in detail with

sketches. (10 Marks)

PART _ BA four storey building of plan shown in Fig.Q.5 is located in seismic zone IV. Number ofstories

- 4 (G + 3). Infill walls are of 250 mm thick along x direction and 150 mm thick

along y direction. Frame type -

special moment resisting frame. Type of soil : rock.Column sizes 250mm x 450mm. Beam sizes 250mm x 400mm. Depth of slab : l00mm'Floor height: 3.5m imposed load : 3.5 kN/m2. Compute the base shear and storey shearalong the height of RCC framed structure. Neglect the effect of infill for computation ofperiod. Importance factor : l. (20 Marks)

-*-Sn1 '9'--*I ofZ

5

+9*t.L

I9rr

J^

Fig.Q.s

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6 For the residential RCC (SMRI') building founded on soft soil and situated in zone V shownin Fig.Q.6. Compute the seismic forces for each storey using dynamic analysis procedure.Given : the free vibration analysis results.frequencv : {w} = ftl;tJi 120'1ssr,.l3' l'modes : {0}, = ]r.rrr l t*1, = ]- o.ror l t6t, =

lo :roJ l- r r szJseismic weights : Wr : Wz: W:: 1962 kNstiffrress : kr : k2 = 160 x 103 kN/m and k3 :240 x l0

\Jt

Fig.Q.6.

Write short note on various load combinations to be considered for seismic resistant design

I r.oo I)-z.qztlI oor, l

3 kN/m. (20 Marks)

7a.b.

of RCC structures. (08 Marks)What are the ductile detailing provisions for beams (for flexure and shear)? Explain withneat sketches. (12 Marks)

Explain various modes of failure of masonry buildings with neat sketches. (10 Marks)What are the special measures to make the masonry structures earthquake resistant?

(I0 Marls)

8a.b.

1af )