CE2306 Design of RC Elements Anna
University Question bank Question Paper 2 marks and 16 Marks , important
university questions
PART-A
UNIT – I
1. What are the advantages of limit state
method over working stress and ultimate load methods?
2. How do you find the moment of
resistance of a beam section?
3. Discuss the merits of working stress
method?
4. What is modular ratio? Determine the
modular ratio at M20 grade concrete.
5. What do you understand by limit state
of collapse?
6. Draw stress-strain curve for various
grades of steel.
7. State the assumptions made in working
stress method.
8. What is modular ratio? Determine
the modular ratio at M25 grade concrete.
UNIT – II
1. Distinguish between one –way and two way
slabs.
2. Explain the terms ‘balanced’, ‘over
reinforced’ and ‘under reinforced’ sections in bending
3. Discuss the different limit state to be
considered in reinforced concrete design?
4. Why is it necessary to provide transverse
reinforcement in a one way slab?
5. What are the three basic methods using
factor of safety to achieve safe workable structures?
6. Explain maximum depth of neutral axis.
7. Find the depth of neutral axis in terms of
‘d’ for a balanced section using Fe 415 steel, in limit state method.
8. What is the difference in the design of
one way slab and two way slabs?
UNIT – III
1. What are the types of reinforcements used
to resist shear?
2. Explain the difference between primary and
secondary torsion. Give two examples each.
3. Under what circumstances are doubly
reinforced beams used?
4. Reinforced concrete slab are generally
safe in shear and do not require shear reinforcement? Why?
5. What is modular ratio?
6. Mention the difference in design
principles for L Beam and T Beam.
7. When shear reinforcement is necessary in a
beam
8. What is bond stress? Write an expression
for it.
UNIT IV
1 What is the minimum and maximum percentage
of steel allowed in R.C.Column? Explain why it is necessary to specify the
minimum and maximum percentage.
2 Give example of columns that are in
practice subjected to unaxial and biaxial bending.
3 Explain (a) Equilibrium
torsion (b) Compatibility torsion
4 How do you classify a column as long?
5 What will be minimum and maximum area of
tension reinforcement in a beam?
6 How shear reinforcement improves the
strength of beam?
7 How do you classify a column as short or
long?
8 Write the procedure for the design of an
axially loaded short column.
Unit – V
1. Sketch the placement of steel in
rectangular footing with a non-central load.
2. What are the situations in which combined
footings are preferred over isolated footings?
3. Draw a neat sketch of a masonry footing.
4. What is slenderness ratio for a masonry
wall? State the maximum values?
5. Compare the behavior of tied and spirally
reinforced column.
6. How do you classify one-way footing and
two-way footing in foundation?
7. Under what circumstances a trapezoidal
footing become necessary?
PART-B
UNIT - I
1. A singly reinforced concrete beam is of
width 450mm and effective depth 715mm. It is reinforced with 8Nos.20mm mild
steel bars. Assuming M20 concrete, determine its moment of resistance according
to the working stress method. Determine also the stress in steel when the beam
is subjected to the above moment.
2. Determine the reinforcement for a T beam
with flange width = 1500mm, web width = 300mm, thickness of slab = 100mm,
effective depth 735mm, to carry a moment of 380kNm due to characteristic loads.
Use M25 concrete and Fe 415 steel. Using Working Stress Design.
3. A singly reinforced concrete beam is of
width 400mm and effective depth 615mm. It is reinforced with 8Nos.20mm mild
steel bars. Assuming M25 concrete, determine its moment of resistance according
to the working stress method. Determine also the stress in steel when the beam
is subjected to the above moment.
4. Design a rectangular slab supported on its
all four edges (600mm thick) over a classroom of size 4.8m x6.2m. Two adjacent
edges of the slab are discontinuous and the remaining two edges are continuous.
A finishing surface of cement concrete of 20mm shall be provided over the slab.
The slab shall be used as classroom. M20 grade of concrete and HYSD bars shall
be used. The unit weight of finishing surface concrete is 24KN/m3.
5. Design a rectangular beam section
subjected to an ultimate moment of 120kNm. Use concrete M20 and steel Fe415.
Adopt limit state method.
UNIT II
1. A rectangular beam has b=200mm, d=400mm if
steel used is Fe 415 and grade of concrete is M25. Find the steel required to
carry a factored moment of 12kNm.
2. Design of roof slab for an interior panel
of size 5mx6m. Live load is 5.0KN/m2. Use M30 Concrete and Fe 415
Steel.
3. Design a simply supported R.C.C.SLAB for a
roof of a hall 4mx10m (inside dimensions) with 230mm walls all around. Assume a
live load of 4kN/m2 and finish 1KN/m2.Use grade 25
concrete and Fe 415 steel.
4. A T beam continuous over several supports
has to carry a factored negative support moment of 1000kNm. Determine the area
of steel at supports if bW = 400MM, bfy =1600mm, Df
= 100mm, D=610mm, d’ = 60mm, fck = 30N/mm2, f
= 415 N/mm2.
5. A doubly reinforced concrete beam is 250mm
wide and 510mm depth the center of tensile steel reinforcement. The compression
reinforcement consists of 4 Nos. of 18mm dia bars placed at an effective cover
of 40mm from the compression edge of the beam. The tensile reinforcement
consists of 4Nos. of 20mm diameter bar. If the beam section is subjected to a
BM of 85kNm, calculate the stresses in concrete and tension steel.
6. Design a smallest concrete section of a RC
beam to resist an ultimate moment of 62kNm, assuming width 230mm, concrete
grade M20 and HYSD bars of grade Fe415.
7. A rectangular beam of width 300mm and
effective depth 500mm reinforced with 4 bars of 12mm diameter. Find the moment
of resistance and stresses in the top compression fiber of concrete and tension
steel. Use concrete M20 and steel Fe415. A dopt working stress method.
8. Design the interior span of a continuous
one way slab for an office floor continuous over tee beams spaced at 3 meters.
Live load = 4kN/m, Floor finish = 1kN/m2.Use concrete M20 and steel
Fe415. Adopt limit state method. Sketch the steel reinforcement.
UNIT – III
1. A rectangular beam width b=350mm and
d=550mm has a factored shear of 400kN at the critical section near the support.
The steel at the tension side of the section consists of four 32mm bars which
are continued to support. Assuming fck=25 and fy=415(N/mm2)
design vertical stirrups for the section.
2. A reinforced concrete rectangular beam has
a breadth of 350mm and effective depth of 800mm. It has a factored shear of
105kN at section XX. Assuming that fck=25, fy=415(N/mm2)
and percentage of tensile steel at that section is 0.5percent, determine the
torsional moment the section can resist if no additional reinforcement for
torsion is provided. Workout the problem according to IS456 principles of
design for torsion.
3. A simply supported beam is 5m in span and
carries a characteristic load at 75kN/m. If 6Nos. of 20mm bras are continued
into the supports. Check the development length at the supports assuming grade
M20 concrete and Fe415steel.
4. A rectangular RCC beam is 400x900mm in
size. Assuming the use of grade M25 concrete and Fe415 steel, determine the
maximum ultimate torsional moment at the section can take it.
(i)
No torsion
reinforcement is provided and
(ii) Maximum torsion reinforcement is provided.
5. A rectangular beam width b = 250mm and
effective depth 500mm reinforced with 4 bars of 20mm diameter. Determine the
shear reinforcement required to resist a shear force of 150kN. Use concrete M20
and steel Fe415.
6. Design a rectangular beam section of width
250mm and effective depth 500mm, subjected to an ultimate moment of 160kNm,
ultimate shear force of 30kN and ultimate torsional moment of 10kNm. Use
concrete M20 and steel 415.
7. A RC beam 300x450mm in cross section in
reinforced with 3 Nos. 20mm diameter of grade Fe250, with an effective cover of
50mm. The ultimate shear at the section of 138kn.Design the shear reinforcement
(i)Using only vertical strips without bending any bar for resisting. (ii) Bending
1 bar dia 20mm at 45 degree to resist shear at the section. Assume concrete of
grade M20.
8. A reinforced concrete beam 500mm deep and
230mm wide is reinforced with 8Nos.20mm diameter bars at mid span to carry a
UDL of 22.5kn/m (inclusive of its own weight) over simple span of 8m. Assuming
concrete grade M20, steel grade Fe415, load factor 1.5 and width of support
230mm (i) determine the minimum development length required for 20mm diameter
bar to develop full strength (ii) apply check for flexural development length
at support assuming all bar to continue at support (iii) determine the minimum
number of bars required at support for development length of flexure.
UNIT – IV
1. A rectangular column of effective height
of 4m is subjected to a characteristics axial load of 800kN and bending moment
of 100kNm about the major axis of the n. Design a suitable section for the
column so that the width should not exceed 400mm. Use the minimum percentage of
longitudinal steel. Assume fy=415N/mm2 and fck=20N/mm2.
2. An R.C.Column 500x400mm is subjected to an
axial ultimate load of 2500kN and bent in single curvature about the minor axis
with My(top)=90knm and My(bottom)=120knm as
ultimate moments. If L0=7.2m and Le=5.75m on both axes,
calculate the design moments for the column.
3. Design the reinforcement in a spiral
column of 400mm diameter subjected to a factored load of 1500kN.The column has
an supported length of 3.4m and is braced against side way. Use M20 concrete
and Fe415 steel.
4. A column 300x400mm has an unsupported
length of 3m and effective length of 3.6m.If it is subjected to pu=1100kNm and
Mu=230kNm about the major axis, determine the longitudinal steel using
fck=25N/mm2.
5. Calculate the ultimate strength in axial
compression of column 400mm in diameter and reinforced with 8Nos. of 20mm dia.
of grade Fe250 when the column in helically reinforced by 8mm dia at (i) 60mm
pitch, (ii) 30mm pitch. Assume concrete of grade M20. Assume clear cover equal
to 40mm.
6. Design an axially loaded tied column
400mmx400mm pinned at both ends with an unsupported length of 3m for carrying a
factored load of 2300kN.Use M20 concrete and Fe415 steel.
7. Design a circular column with helical
reinforcement of 400mm diameter and 4m in length to carry factored load of
1000kN.The column is hinged at both ends. Use concrete M25 and steel Fe415.
8. A column 300mmx400mm has an unsupported
length of 4m and fixed at both ends. It is subjected to a factored load of
1000KN and an ultimate moment of 200kNm about the major axis. Determine the
longitudinal reinforcement and lateral ties. Use concrete M25 and steel Fe415
d’=60mm.
UNIT
– V
1. A rectangular column 300mmx400mm
reinforced with 20mm diameter bars carries a load of 1400kN. Design a suitable
footing for the column. The safe bearing capacity of the soil is 200kN/m2.Use
concrete M20 and steel Fe415.
2. Design a combined rectangular footing for
two columns spaced at 5 centers. The first column 400mmx400mm carries a load of
1200kN and the second column 450mmx450mm carries a load of 1800kn at service
state. Weight of Soil = 20kN/m2, angle of repose=300 and
safe bearing capacity of soil = 150kN/m2. Use concrete M20 and steel
Fe415.
3. Design a interior wall of a single storied
workshop of height 5.4m surrounding a RCC roof. The bottom of the wall rests
over a foundation block. Assume roof load equal to 45kN/m. A pier provided at a
spacing of 3.6m along length of wall.
4. Design a compound wall of height 1.8m to
the top of 100mm thick coping. Assume wind pressure is equal to 1kN/m2
and is UDL. The safe bearing pressure of soil is 120kN/m2.
5. A solid footing has to transfer a dead
load of 1000kn and an imposed load of 400kn from a square column 400mmx400mm.
Assuming fck=20N/mm2 and fy=415N/mm2 and safe
bearing capacity to be 200KN/m2, Design the footing.
6. Design a combined rectangular footing for
two columns spaced at 500cm centers. The first column 300mmx300mm carried load
of 1000kn.and second column 300mmx300mm carries a load of 1500kn at service
state. Weight of Soil = 20kN/m2, angle of repose=300 and
safe bearing capacity of soil = 150kN/m2. Use concrete M25 and steel
Fe415.
7. A solid footing has to transfer a dead
load of 1000kN and an imposed load of 400kN from a square column 400x400mm
(with 16mm bars.) Assuming fy=415 and fck=20N/mm2
and safe bearing capacity to be 200kN/m2. Design the footing.
8. Design a plain concrete footing for a
450mm wall carrying 300kN per meter length. Assume grade 20 concrete and the
bearing capacity of soil to be 200kN/m2.
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