TKN/KS/16/2249 1

B.E. (Civil Engineering) Seventh Semester Advanced Concrete Structures

P. Pages : 4 TKN/KS/16/2249

Time : Four Hours Max. Marks : 80

_____________________________________________________________________

Notes : 1. Answer three questions from section A and two questions from section B.

2. Due credit will be given to neatness and adequate dimensions.

3. Assume suitable data wherever necessary.

4. I. S. 456 (Revised) I. S. 875 may be consulted.

5. Use of non-programmable calculator is permitted.

1. Find the moment of Resistance of T- Beam if the beam also carries a compression

reinforcement in the form of 4 x 20 mm provided at a distance of 40mm from the top fibre

as shown in fig (1). Use M20 concrete and Fe415 steel.

100mm

600mm

300

5x20

4x20mm

bf=750mm

Fig.1

13

2. Design a biaxially eccentrically loaded braced rectangular column to carry an ultimate

axial land of 1500 kN and ultimate by axial moments of Mux = 150 kN.m and Muy = 100

kN-m. acting about axes bisecting the depth and width of column respectively. The

effective length about x-axis is 3m and about y-axis is 2.75m. The unsupported length

about both axes is 3.5m.

Column size is B= 400mm

D= 600mm. Use M25 concrete and Fe415 steel.

13

3. Design isolated footing for a rectangular column 600mm x 400mm. Carrying an axial load

of 800 kN and a bending moment of 125 kN-m the safe bearing capacity of soil is 150

kN/m2. Use M20 grade of concrete and Fe500 grade of steel. Draw the reinforcement

details.

13

4. Determine the reinforcement required for a rectangular beam section with the following

data.

i) Width of section = 300 mm

ii) Factored B.M.= 90 kN-m.

iii) Depth of section = 600 mm.

iv) Factored torsional moment = 50 kN-m.

v) Factored shear force = 80 kN.

Use M20 grade concrete and Fe415 grade of steel.

13

*0869*

NagpurStudents.Org

TKN/KS/16/2249 2

5. a) Draw maximum Bending moment diagram for a fixed ended beam carrying 25 kN/m load

at collapse as shown in fig. 1. Use 25 % Redistribution of moments.

25kN/m

7.5m

Fig.1.

9

b) Explain in short the importance of moment redistribution.

5

SECTION – B

6. Design a combined footing for two columns 3m c/c apart carrying loads of 950 kN and

1200 kN respectively. The size of columns are 300 mm x 300mm and 450 x 450mm.

respectively. Length of footing is restricted to 5m. SBC of soil is 150 kN/m2.

Use M20 concrete and Fe500 steel. sketch the reinforcement details.

20

7. Design a two way slab panel for a room having effective dimensions of 4.5m x 5.5m. The

slab has one short edge continuous and all other edges discontinuous. The slab carries a live

load of 4 kN/m2 and finishing load of 1 kN/m2.

Design the panel using M20 concrete and Fe500 steel. Provide necessary check as per IS

code.

Sketch reinforcement details.

20

8. Design a cantilever retaining wall, which is required to support a back fill of earth 4.5m

high above the ground level or the toe side of the wall. Consider the backfill surface to be

inclined at an angle of 15º with the horizontal. Assume good soil for foundation at a depth

of 1m below ground level with bearing capacity of 150kN/m2. Further assume the backfill

to comprise granular soil with a unit weight of 16 kN/m3 and an angle of shearing resistance

of 30º Assume the coefficient of friction between soil and concrete to be 0.4. Use concrete

of M20 grade and steel of Fe415 grade. sketch details.

20

Table : Stress- Strain Relation for High Yield Strength Steel.

Stress LevelFe415 Fe500

Total Strain Stress N/mm2 Total Strain Stress (N/mm2)

0.80 fyd 0.00144 288.7 0.00174 347.8

0.85 fyd 0.00163 306.7 0.00195 369.8

0.90 fyd 0.00192 324.8 0.00226 391.3

0.95 fyd 0.00241 342.8 0.00277 413.0

0.975 fyd 0.00276 351.8 0.00312 423.9

1.00 fyd 0.00380 360.9 0.00417 434.8

NagpurStudents.Org

TKN/KS/16/2249 3

NagpurStudents.Org

TKN/KS/16/2249 4

*********

NagpurStudents.Org