Categories: 6th Semester

1

Seat No. ______________________ Enrolment No._______________________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE ? SEMESTER VI (NEW SYLLABUS) EXAMINATION – SUMMER- 2018

Subject Code: 2164001 Date: 28/04/2018

Subject Name: Design of Concrete Structures

Time: 10:30 am to 1:30 pm Total Marks: 70

Instructions:

1. Attempt all questions.

2. Use of IS 456 and SP 16 is allowed.

3. Make suitable assumptions wherever necessary.

4. Draw neat and clean sketches.

5. Figures to the right indicate full marks.

MARKS

Q.1 (a) Explain difference between working stress method (WSM) and

limit state method (LSM) of structural design philosophy.

07

(b) Derive the expression for depth of neutral axial and moment of

resistance for a balanced RCC beam section.

07

Q.2 (a) A singly reinforced beam having an effective span of 4 m and c/s

area of 230 mm ? 500 mm, is reinforced with 3 nos. of 20 mm

diameter HYSD bars with an effective cover 35 mm. Calculate

allowable superimposed load on the beam. Use M 25 grade of

concrete and Fe 415 grade of steel.

07

(b) A doubly RC rectangular beam with 230 mm wide and 500 mm

effective depth having 2 nos. 16 mm ? at compression side and

4 nos. 25 mm ? at tension side. Effective cover at both the side is

50 mm and grade of materials used are fck = 20 N/mm

2

and

fy = 415 N/mm

2

. Find Moment of resistance of the beam section.

07

OR

(b) A simply supported R.C.C. beam of size 230 mm wide and 450 mm

depth with clear span of 5 m is reinforced with 4 nos. of 16 mm

diameter bar and clear cover of 25 mm. Width of support is

230 mm. It is loaded by uniformly distributed load of 50 kN/m.

Design the Shear Reinforcement using 2 legged 8 mm HYSD steel

stirrups. Use M 20 grade of concrete and Fe-415 grade of steel.

07

Q.3 (a) A reinforced slab 120 mm thick is supported by simply supported

T ? beams with an effective span of 3.6 m. T- beams are spaced

3.2 m center to center. The effective depth and width of the web are

560 mm and 450 mm respectively. 8 nos. of HYSD bars are

provided in 2 layers in tension side with an effective cover 50 mm.

Determine the depth of neutral axis and moment of resistance of

T-beam. Use M20 concrete and Fe 415 steel.

07

(b) Design a simply supported one way slab having clear span of

3 m x 7 m supported on 250 mm wide beams. The slab carries a

3 kN/m

2

live load and 1.0 kN/m

2

floor finish load. Use M 20 grade

of concrete and Fe 415 grade of steel. Check criteria for deflection

and development length.

07

OR 1

Seat No. ______________________ Enrolment No._______________________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE ? SEMESTER VI (NEW SYLLABUS) EXAMINATION – SUMMER- 2018

Subject Code: 2164001 Date: 28/04/2018

Subject Name: Design of Concrete Structures

Time: 10:30 am to 1:30 pm Total Marks: 70

Instructions:

1. Attempt all questions.

2. Use of IS 456 and SP 16 is allowed.

3. Make suitable assumptions wherever necessary.

4. Draw neat and clean sketches.

5. Figures to the right indicate full marks.

MARKS

Q.1 (a) Explain difference between working stress method (WSM) and

limit state method (LSM) of structural design philosophy.

07

(b) Derive the expression for depth of neutral axial and moment of

resistance for a balanced RCC beam section.

07

Q.2 (a) A singly reinforced beam having an effective span of 4 m and c/s

area of 230 mm ? 500 mm, is reinforced with 3 nos. of 20 mm

diameter HYSD bars with an effective cover 35 mm. Calculate

allowable superimposed load on the beam. Use M 25 grade of

concrete and Fe 415 grade of steel.

07

(b) A doubly RC rectangular beam with 230 mm wide and 500 mm

effective depth having 2 nos. 16 mm ? at compression side and

4 nos. 25 mm ? at tension side. Effective cover at both the side is

50 mm and grade of materials used are fck = 20 N/mm

2

and

fy = 415 N/mm

2

. Find Moment of resistance of the beam section.

07

OR

(b) A simply supported R.C.C. beam of size 230 mm wide and 450 mm

depth with clear span of 5 m is reinforced with 4 nos. of 16 mm

diameter bar and clear cover of 25 mm. Width of support is

230 mm. It is loaded by uniformly distributed load of 50 kN/m.

Design the Shear Reinforcement using 2 legged 8 mm HYSD steel

stirrups. Use M 20 grade of concrete and Fe-415 grade of steel.

07

Q.3 (a) A reinforced slab 120 mm thick is supported by simply supported

T ? beams with an effective span of 3.6 m. T- beams are spaced

3.2 m center to center. The effective depth and width of the web are

560 mm and 450 mm respectively. 8 nos. of HYSD bars are

provided in 2 layers in tension side with an effective cover 50 mm.

Determine the depth of neutral axis and moment of resistance of

T-beam. Use M20 concrete and Fe 415 steel.

07

(b) Design a simply supported one way slab having clear span of

3 m x 7 m supported on 250 mm wide beams. The slab carries a

3 kN/m

2

live load and 1.0 kN/m

2

floor finish load. Use M 20 grade

of concrete and Fe 415 grade of steel. Check criteria for deflection

and development length.

07

OR

2

Q.3 (a) Design a continuous rectangular RC beam of span 6 m to carry self-

weight load, fixed imposed load of 10 kN/m and live load of

15 kN/m. The beam continuous over a three span. Use M 20 grade

of concrete and Fe 415 grade of steel.

07

(b) Design a simply supported RCC slab having clear span 4 m ? 4 m

rested on the 230 mm thick brick wall, subjected to live load of 3

kN/m

2

for the corners held down condition. Use M 20 grade of

concrete and Fe 415 grade of steel. Checks are not required.

Provide detailed sketches.

07

Q.4 (a) Design a single flight staircase in a residential building, having

floor height of 3 m. Staircase is supported at top and bottom riser

by beam having width 300 mm. Consider Thickness of waist slab

is 180 mm, riser is 200 mm and tread is 300 mm. Use M 30 grade

of concrete and Fe 415 grade of steel.

Evaluate : (a) The effective span (b) Design load (c) Reinforcement in waist slab. (d) Prepare a detail sketch of staircase.

07

(b) Design a short circular R.C.C. column to carry an axial load of 2000

kN. Use M25 grade concrete and Fe-415 grade steel. Show the

reinforcement details with neat sketches.

07

OR

Q.4 (a) Design a dog legged staircase in a residential building with clear

dimensions of staircase area as 2000 mm ? 4000 mm. Floor to floor

height is 3.2 m. Use M 30 grade of concrete and Fe 415 of steel.

07

(b) Design a R.C.C. short column square in section to carry out

factorized design axial load of 4500 kN. The unsupported length of

column is 3 m. Show the reinforcement details with neat sketches.

07

Q.5 (a) Design an isolated pad Footing for a square R.C.C. column of size

400 mm ? 400 mm carrying an axial load of 1800 kN. Safe bearing

capacity of soil is 200 kN/mm2. Use M-20 grade concrete and Fe-

415 as steel reinforcement. Check for shear and bearing pressure is

not required. Show the details with neat sketches

07

(b) Design a combined rectangular footing for 1200 kN and 1700 kN

column loads spaced at 4 m centre to centre. Each size of the

column is 500 mm ? 500 mm and Safe bearing capacity of soil is

280 kN/m

2

. Use M 20 grade of concrete and Fe 415 grade of steel.

07

OR

Q.5 (a) Design a square isolated sloped footing for a column of size 600

mm ? 600 mm carrying a service axial load of 2000 kN. Safe

bearing capacity of soil is 250 kN/m

2

. Use M 20 grade of concrete

and Fe 415 grade of steel. Check for one way share only.

07

(b) Design a cantilever retaining wall (T type) to retain earth for a

height of 4m. The backfill is horizontal. The density of soil is

18 kN/m

3

. Safe bearing capacity of soil is 200 kN/m

2

. Take the co-

efficient of friction between concrete and soil as 0.6. The angle of

repose is 30?. Use M20 grade of concrete and Fe 415 grade of steel.

07

*************

746268 PAPER V - REHABILITATION MEDICINE INCLUDING GERIATRIC MEDICINETHE TAMIL NADU DR. M.G.R. MEDICAL UNIVERSITY…

4 years ago

746268 PAPER V - REHABILITATION MEDICINE INCLUDING GERIATRIC MEDICINETHE TAMIL NADU DR. M.G.R. MEDICAL UNIVERSITY…

4 years ago

746267 PAPER IV - P.T. IN ORTHOPAEDICSTHE TAMIL NADU DR. M.G.R. MEDICAL UNIVERSITY [LN 6267]…

4 years ago

746267 PAPER IV - P.T. IN ORTHOPAEDICSTHE TAMIL NADU DR. M.G.R. MEDICAL UNIVERSITY [LN 6267]…

4 years ago

746266 PAPER III – CLINICAL ORTHOPAEDICSTHE TAMIL NADU DR. M.G.R. MEDICAL UNIVERSITY [LN 6266] AUGUST…

4 years ago

746265 PAPER II – P.T. IN NEUROLOGYTHE TAMIL NADU DR. M.G.R. MEDICAL UNIVERSITY [LN 6265]…

4 years ago