bt31R0707

Page 1

Set No. 1

Code No: V3102/R07

III B.Tech I Semester Supplementary Examinations, May 2010 STRUCTURAL ANALYSIS-II (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. A parabolic arch hinged at the springings and crown has a span of 20 m. The central rise of the arch is 4 m. It is loaded with a uniformly distributed load of intensity 2 kN/m on the left 8 m length. Calculate (a) the direction and magnitude of reaction at the hinges,

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(b) bending moment, normal thrust and shear at 4m and 15m from left end. [16] 2. A two hinged parabolic arch of span L has central rise of one-fourth of the span. Show that the horizontal thrust on the arch due to a point load of W at its quarter span is 5W/8. Take I = Io Sec θ.

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3. Explain the Portal method for analyzing a building frame subjected to horizontal forces. [16]

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4. A horizontal beam ABCD, is carried on hinged supports and is continuous over three equal spans each of 3 m. All the supports are initially at the same level. The first span is loaded with central point load of 8 kN, second span is loaded with a UDL of intensity 2 kN/m and the third span is loaded with a point load of 9 kN acting 2 m from right support. Using the slope deflection method, plot the bending moment diagram, if the support A settles by 10 mm, B settles by 30 mm and C settles by 20 mm. Take I = 2.4 × 106 mm4 and E= 2 ×105 N/mm2 . [16]

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w w

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5. (a) Define the term “CARRY OVER FACTOR”. (b) Explain the term “Distribution Factor”. (c) Derive the relation for the stiffness factor for a beam S.S at its both ends. [3+3+10]

6. Analyse the continuous beam shown in figure 6 by Kani’s method and draw BMD. [16]

Figure 6 1 of 2


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