Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 5th Semester (Fifth Semester) 2017-2018 NCE505 Design Of Concrete Structures I Question Paper
Paper Id: 0 0 4 0 Roll No:
B TECH
(SEM V) THEORY EXAMINATION 2017-18
DESIGN OF CONCRETE STRUCTURES -I
Time: 3 Hours T 0tal Marks: 100
Notes: Attempt all Sections. Assume any missing data.
M
1. Attempt all questions in brief. 2 x10 = 20
a) What is modular ratio?
b) Determine the modular ratio of M20 grade concrete.
c) What is effective depth in a beam section?
d) What is minimum grade of concrete for general reinforced concrete work recommended by the
IS code-45622000.
e) What is determined in slump cone test?
i) What is neutral axis?
g) What is effective cover?
h) What is lever arm?
i) What is creep of concrete?
j) What is shrinkage of concrete?
w
2. Attempt any three of the following: 10 x 3 = 30
a) Write short note on water-cement ratio.
b) Write assumption made in working stress method.
c) What are the over reinforced section and under reinforced section.
(1) Write formula to determine the moment of resistance of over reinforced section and under
reinforced section. With diagram of section
e) What is critical section and critical neutral axis?
SECTION C
3. Attempt any one part of the following 10 x 1 =10
a) Crass section of a singly reinforced concrete beam is 300mm wide and 500mm deep. To
centre of reinforcement which consist of 4 bars of 16mm diameter? If stresses in concrete and
steel are not exceed 7N/mm2 and 140N/mm2 .respectively. Determine the moment of resistance
ofbeam. Take m= 13.33.
b) A singly reinforced concrete beam in 300mm wide and 450mm deep to the centre of
reinforcement which consists of 4 bars of 16mm diameter. If safe stress in concrete and steel
are 7N/mm2 and 230N/mm2. Respectively. Find moment of resistance of section. Take
m=13.33.
4. Attempt any one part of the following: 10 x 1=10
a) A singly reinforced rectangular beam 350mm wide has a span of 6.25m and carries a load of
16.3KN/m. if stresses in concrete and steel shall not exceed 7N/mm2 and 230N/mm2. F ind the
effective depth and area of tensile reinforcement. Take m=13.33.
b) A doubly reinforced rectangular beam is 300mm wide and 500mm deep to centre of tension
steel. It is reinforced with 4 bars of 18mm dia. as compressive steel at an effective cover of
40mm and with 4 bars of 20mm dia. as tensile steel. If stresses in concrete and steel are not to
exceed 7N/mm2 and 230N/mm2.respectively. Find moment of resistance of section. Take
m=13.33.
5.
Attempt any one part of the following: 10 x 1=10
a) A beam of reinforced concrete is 300mm wide and 450mm deep to centre of tension steel. It is
reinforced with 4 bars of 16mm diai as compressive steel and 4 bars of 25mm diai as tensile
steel. Determine the moment of resistance of section Cover to centre of compressions
steel=50m use M20 concrete and F e415 steel Take m=13i33i
b) What is meant by segregations and bleeding of concrete?
6. Attempt any one part of the following: 10 x 1=10
b)
a) A singly reinforced beam 250mm wide is 400mm deep to the centre of tensile reinforcement
.determine the limiting moment of resistance of beam section and limiting area of
reinforcement use M20 concrete and Fe250 steel
b) A beam of rectangular section 300mm wide and 500mm effective depth is provided with 4
bars of 18 mm dia. as tensile steel. find depth of neutral axis use M20 concrete and F e250 steel
Attempt any one part of the following: 10 x 1=10
A T beam of ?ange width 1400mm, ?ange thickness 100mm, rib width 300mm and effective depth
500mm has to be designed as a balanced section F ind the reinforcement required and limiting
moment of resistance. use M20 concrete and Fe250 steel
A reinforced concrete column is 450mm x400mm and has to carry a factored load of 1800KN.
Length of column is 2m.find area of reinforcement required Use M20 concrete and F 6250 steeli
This post was last modified on 29 January 2020