No. of Printed Pages: 5 IBCE-0411
DIPLOMA IN CIVIL ENGINEERING
DCLE(G) I DCLEVI
Term-End Examination
December, 2016

U0262
BCE-041 THEORY OF STRUCTURES -II
Time hours Maximum Marks: 70
Note: Question no. 1 is compulsory. Attempt any four questions from the remaining questions. Assume suitable data wherever needed and mention it clearly. Use of scientific calculator is allowed but IS 456 code is not permitted for use.


1. Choose the most appropriate answer from the given alternatives in questions to below: 7x2=14

In the notation 25 is considered in

cm2/g

N/m2

kN

N/mm2

For determining the characteristic strength of concrete, the cube size is

150 cm

150 mm

100 mm

75 mm

The value of aspect ratio for determining the nature of a slab as one-way or two-way is

1

2

3

4

In Limit state design approach

partial safety factors are taken for loads only

partial safety factors are taken for materials only

partial safety factors are taken for both loads and materials

partial safety factors are not considered


What type of forces may produce shear forces in columns in a building?

Dead loads

Live loads

Wind loads

Snow loads

The minimum number of bars in a square column is

4

8

6

12

Elastic linear distribution of strains across sections is considered in

Working stress method

Ultimate load method

Limit state method

None of the above


2. Cross-section of a doubly reinforced beam is subjected to a service load moment of 175 kNm. Determine the stresses in concrete and steel. Use the following data

b =300 mm, d =550 mm,

=50 mm, O'cbc MPa,

O'st 130 MPa

M 20 concrete and Fe 250 steel has been used. 2 -25 ell and 3 -36 ell reinforcement bars have been used in compression and tension sides respectively. Notations, here, have their usual meanings. Use working stress method. 14

3. What do you understand by chemical admixtures used in concrete Enlist the names of some of them and describe any one briefly. 7

What do you understand by a 'Limit state' Discuss the concept as used for the design of concrete structures. 7

4. Discuss why shear stirrups are provided in beams. 7
Draw a neat sketch of an RC retaining wall and explain how its stability is checked. 7

5. Design a RC slab for a room of size (effective) of 4m x 10m. The slab is simply supported on all sides on 230 mm thick walls. Use M 20 concrete and Fe 415 steel. Slab is subjected to an imposed load of 4 kN/m2 including floor finish. Nominal cover =20 mm. 14

6. What do you understand by 'Development length' Describe with a neat sketch. 7

What is the function and importance of lateral ties in concrete columns Discuss with a neat sketch. 7

7. Write short notes on any two of the following topics: 2 x 7=14

Compaction of Concrete

Balanced Beam Section

T-beam