B.Tech BASIC REINFORCED CONCRETE DESIGN AND DRAWING (Civil Engineering) question paper

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B.Tech. I Semester Supplymentary Exams, May/June û 2009
BASIC REINFORCED CONCRETE DESIGN AND DRAWING
(Civil Engineering)

Time: 3 hours Max. Marks.80


Part û A
(Answer any One Question 1×32=32)


1. Design beams for a class room of 6x12 m in size. The thickness of the slab above
the beams is 120 mm. The centre to centre distance of the beams is 3 m. Use M 2 o
grade concrete. Draw neatly the structural details to a suitable scale.


2. A circular column of 440 mm diameter transfers an axial dead load of 520 KN
and an axial live load of 450 kN. The column consists of 8 steel bars of 12mm
diameter. The safe bearing capacity of the soil is 120 KN/ m 2 . Concrete is of M 2 o
grade and steel is of fe 415 grade. Design a circular footing to support the column
and draw neatly the structural details to a suitable scale.


Part - B
(Answer any three Questions 3×16=48)


1.a] Explain the equivalent concrete cover of a reinforced concrete member?


b] A singly reinforced concrete beam is 300x450 mm deep to the centre of tension
reinforcement which consists of 4 bars of 16mm diameter. If the safe stresses on
concrete and steel are 7 N / mm 2 and 230 N / mm 2 respectively, find the moment
of resistance of the section. Take M = 13.33.


2.a] Explain the stress strain curves specified by IS 456 for reinforcing steel.


b] Why the limit state design method is considered superior to the working stress
design approach. Explain.


3.a] Explain the terms (a) bond and anchorage (b) development length in detail.


b] A reinforced concrete beam is having seven numbers of 16 mm diameter bars as
tension reinforcement. Find the distance from the centre of the beam where the
central reinforcement can be curtailed taking care that the arrangement of steel
will be symmetrical after curtailments. Concrete is M 2 o grade and steel is fe 415
grade. Take d=300mm and Span of the beam as 4m.


4. Design a slab over a residential room of 4m x 6m size. Two short edges of the
slab are discontinuous. Use M 2 o grade concrete and fe 415 grade steel.



5. A simply supported beam of 12m span is provided with 1.6 percent tension
reinforcement with no compression steel. The area of tension steel required by
calculation is only 1.25 percent. Determine the depths of beams for
(a) fe500 and

(b) fe 415 grade steel if the deflection is to be in safe limits.

B.Tech. I Semester Supplementary Exams, May/June û 2009
BASIC REINFORCED CONCRETE DESIGN AND DRAWING
(Civil Engineering)

Time: 3 hours Max. Marks.80

Part û A

(Answer any One Question 1×32=32)


1. Design a square footing to support a column of 540mm x 540 mm in size with
8 steel bars of 20 mm diameter which transfers a dead load of 560KN and a live
load of 880 KN to the footing. The bearing capacity of the footing is 100 KN/ m 2 .
Use M 2 o grade concrete and fe 415 steel. Draw neatly the structural details to a
suitable scale.


2. Design a rectangular slab for a class room of size 4.8 x 6.2m supported on its all
four edges. Two adjacent edges of the slab are discontinuous and the remaining
two edges are continuous. A finishing of 20mm brick concrete surface shall be
provided on the slab. Design the slab using M 2 o grade concrete and fe 415 grade
steel. Draw the structural details neatly to a suitable scale.


Part - B
(Answer any three Questions 3×16=48)

1.a] Explain balanced, under reinforced and over reinforced sections.


b] A singly reinforced concrete beam 300mm wide has an effective depth of 500mm
with an effective span of 5m. It is reinforced with 804mm 2 of steel. If the beam
carries a total load of 16 KN / m on the whole span, determine the stresses
produced in concrete and steel. Take m = 13.33.


2.a] What is meant by limit state. Enumerate the limit states commonly used in the
limit state design.


b] What are the various serviceability requirements recommended by IS 456.


3. A T beam slab system of a structure is made up of beams spread at 2.4m with
clear span of 7.0 m on supports of 300mm thick. The dimension of the T beam are
as follows D f = 120mm; bw = 300 mm; D = 600mm. The live load is 10 KN/ m 2 .
Design the shear reinforcement taking M 2 o grade concrete and fe 415 grade steel.
Assume that two numbers of 28 mm bars of tension are continued upto the
support.


4. Design a column of size 400 x 600 mm carrying an axial load of 1600 KN and
factored moments of 120 KN.m and 90 KN.m about major and minor axis. The
grade of concrete is M25 and steel is fe 415.


5.a] Explain the accepted limits for allowable deflection as per IS 456.


b] Explain about the minimum percentages of steel in beams and slabs for crack
control.

III B.Tech. I Semester Supplementary Exams, May/June û 2009

BASIC REINFORCED CONCRETE DESIGN AND DRAWING
(Civil Engineering)

Time: 3 hours Max. Marks.80


Part û A

(Answer any One Question 1×32=32)


1. A rectangular column 650mm x 450mm carries an axial load of 1800KN. Design
the column and rectangular footing for the column. The safe bearing capacity of
the soil is 150 KN/m 2 use M 2 o concrete and fe 415 steel. Draw the structural
details to a suitable scale.


2. Design a slab over 5m x 7m room supported on masonry walls all around with
adequate restraint with corners held down. The live load on slab is 2.5 KN /m 2 .
The slab has a bearing of 150 mm on the walls. Use M 2 o grade concrete. Draw the
structural detailing neatly to a suitable scale.


Part - B
(Answer any three Questions 3×16=48)


1.a] What is grading of aggregate. Explain in detail the role of grading on the
properties of concrete.

b] Explain the environmental exposure conditions as given in IS 456 û 2000.


2.a] Explain characteristic strength of materials and characteristic loads.


b] Explain the stress û strain curves adopted by IS 456 in flexural compression.


3.a] With neat sketches explain equivalent development length of hooks and bends?


b] A simple supported beam is 6m on span and carries a load of 50 KN/m.6 Numbers of 20mm bars are provided at the centre of the span and 4 numbers of
these bars are continued upto the supports. Check the development length if M2o
grade concrete and fe 415 steel are provided.


4. Design a symmetrically reinforced short column 450 x 450mm under bi axial
bending with a load of 1000 KN and Mx = 75 KN-m and My =60 KN-m use M 2 o
grade concrete and fe 415 grade steel.


5.a] Explain the loading conditions for checking Serviceability.


b] What are the IS code methods available for control of crack width on R.C
members? Explain.



B.Tech. I Semester Supplementary Exams, May/June û 2009

BASIC REINFORCED CONCRETE DESIGN AND DRAWING
(Civil Engineering)

Time: 3 hours Max. Marks.80


Part û A
(Answer any One Question 1×32=32)


1. Design completely a doubly reinforced rectangular simply supported beam of
6.20m clear span to carry a live load of 20KN/M and super imposed dead load of
17 KN/m. The dimensions of the beam are restricted to 350mm x 600mm. Use
M 2 o grade concrete and fe 415 steel. Draw the structural detailing neatly to a
suitable scale.


2. A rectangular column 380mm x 520mm size transfer a dead load of 750KN and a
live load of 1350 KN without any moment. The bearing capacity of the soil is
110 KN/ m 2 Design a rectangular footing to support the column and draw the
structural detailing to a suitable scale.


Part - B
(Answer any three Questions 3×16=48)


1.a] Explain how concrete is divided into different grades based on strength as per
IS456-2000.


b] Explain durability requirements as per IS456-2000.


2.a] Explain clearly different limit states.


b] Explain partial safety factors for materials and loads.


3.a] Explain various types of shear reinforcement.


b] Design the shear reinforcement for a beam with b = 350mm; d = 500mm and
Vu = 120KN. Use M25 grade concrete and fe 415 grade steel. The percentage of
steel is 1.67.


4. Design a slab over a residential room of 5mx7m size using IS code method. The
slab is supported on masonry walls of 300mm thick all around with adequate
restraint and the corners are held down. Use M 2 o grade concrete and fe 415 grade
steel.



5. A beam of 450mm width is having 6 Nos of 25mm bars of fe 415 grade. The total
depth of the beam is 950mm. Obtain the arrangement of steel to confirm to the
crack control as per IS456.
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