Register Number
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act,1956)
Course & Branch :B.E - CIVIL
Title of the Paper :Reinforced Concrete Structures – I Max. Marks:80
Sub. Code :620502 (2007-08-09)
Time : 3 Hours
Date :27/04/2012
Session :AN
______________________________________________________________________________________________________________________
1.
PART - A
(10 x 2 = 20)
Answer ALL the Questions
Draw the stress strain curve for concrete and cold deformed steel
as per IS456-2000.
2.
What is the minimum and maximum percentage of steel in beams
as per IS456-2000?
3.
What is the live load in residential building and educational
building, as per BIS?
4.
How are slabs classified as one way and two way slab?
5.
What is the effective span of continuous beams or slabs?
6.
What is the basic value of span/depth ratio of continuous beams
and slabs?
7.
When is a column termed as long column? What is the
maximum slenderness ratio of a slender (long) column?
8.
What is the minimum and maximum percentage of steel for a
column?
9.
What are the critical forces for which an isolated footing is
designed?
10. When is a combined footing adopted?
PART – B
(5 x 12 = 60)
Answer All the Questions
11. Determine the ultimate moment capacity of a beam b = 280mm,
d=510mm, d’ = 50mm, Ast = 2455mm2, Asc = 402mm2, fck = 30
N/mm2, fy = 415N/mm2.
(or)
12. Determine the reinforcement required for a beam b = 300mm, D
= 600mm, Factored moment = 320 kNm. Assume fck = 15
N/mm2, fy = 415 N/mm2.
13. Design a one way slab with a clear span of 4m, simply supported
on 230mm thick masonry walls, and subjected to a live load of 4
kN/m2 and a surface finish of 1 kN/m2. Assume Fe415 steel.
Assume that the slab is subjected to moderate exposure
conditions.
(or)
14. Design a simply supported RCC slab for a roof of a hall 4m x
10m (inside dimensions) with 230mm walls all round. Assume a
live load of 4 kN/m2 and finish 1 kN/m2. Use grade 25 concrete
and Fe415 steel.
15. The floor slab system covering an area of 8.0m x 14.5m (clear
spans) rests on a 230mm thick masonry wall all round. For
economy, the span of the slab is reduced by providing three
(equally spaced) intermediate beams along the 8.0m direction.
The specified floor loading consists of a live load of 4 kN/m2 and
a dead load (due to floor finish, partition, etc.) of 1.5 kN/m2 in
addition to self weight. Assuming Fe415 steel, design and detail
the floor slab. Assume the beam is subjected to moderate
exposure conditions.
(or)
16. Design the interior span of a continuous one way slab for an
office floor continuous over T beams spaced at 4m centres.
Assume fck = 25 N/mm2 and Fe415 steel.
17. Design the reinforcement in a column of size 450mm x 600mm
subjected to an axial load of 2000kN under service dead and live
loads. The column has an unsupported length of 3m and is
braced against side sway in both directions. Use M20 concrete
and Fe415 steel.
(or)
18. A corner column 400 x 400mm located in the lowermost storey
of a system of braced frames is subjected to a factored loads,
Pu = 1300 kN, Mux = 190 kNm, Muy = 110 kNm. The
unsupported length of the column is 3.5m. Design the
reinforcement in the column assuming M25 concrete and Fe415
steel.
19. Design an isolated footing for a square column 450mm x 450mm
reinforced with 8-25mm bars carrying a service load of 2300kN.
Assume soil with a safe bearing capacity of 300 kN/m2 at a depth
of 1.5m below ground. Assume M20 concrete and Fe415 steel for
the footing and M25 concrete and Fe415 steel for the column.
(or)
20. A solid footing has to transfer a dead load of 1000kN and an
imposed load of 400kN from a square column 400 x 400mm with
16mm bars. Assuming fy = 415 N/mm2 and fck = 20N/mm2, safe
bearing capacity to be 200 kN/m2, design the footing.