Design Drawing Of Reinforced Concrete Structures 154c43
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Code: 9A01501 III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall. Part A (Answer any one question, 1 x 28 marks) ***** 1 Design a RC cantilever beam with tension steel only to carry a super imposed load of 10kN/m over a clear span of 3.5 m with a uniform breadth of 300 mm overall depth of beam at the free end is to be 300 mm. Permissible stresses in concrete and steel are 7 N/mm2 and 190 N/mm2. 2
(a) (b)
3
(a)
(b)
4
5
What is meant by limit state? Discuss the different ‘limit states’ to be considered in reinforced concrete design. Why is the partial safety factor for concrete (γc) greater than that for reinforcing steel (γs) in the consideration of ultimate limit states? Part B (Answer any three questions, 3 x 14 marks) A RC floor slab of 100 mm thick is ed by T-beam at 3 m intervals c/c. The slab carries a total superimposed load of 3 kN/m2 in addition to itself weight. The effective span of T-beams is 9 m. Design the beam using M20 grade concrete and Fe 415 grade steel. Determine the moment capacity of a doubly-reinforced rectangular cross-section beam for the following data: b = 350 mm, d = 700 mm, Ast=1400 mm2, fy = 415 N/mm2, fck=25 N/mm2, ASC=650 mm2.
D L
R O
W U
The critical section of an RC rectangular beam is subjected to a bending moment of 28 kNm, a torsional moment of 15 kNm and a shear force of 32 kN. The overall size of the section is 350 mm x 700 mm. provide effective cover to reinforcement as 50 mm. concrete grade M 25 and steel grade Fe 415 are used. Design the necessary reinforcements for the section. Draw the drawings showing the design details. (a) (b)
T N
Explain the limitations of the traditional limit state method with regard to the design of axially loaded reinforced concrete columns. Design the reinforcement in a column of size 300 mm x 450 mm, with an uned length of 6.0 m, subjected to a factored axial load of 1150 kN. Assume the column to be braced, and pinned at both ends in both end directions. Assume M20 concrete and Fe415 steel, and design by: (i) Strength reduction coefficient method. (ii) Additional moment method.
J
6
Design a footing of a brick wall 30 cm thick which is transmitting a load of 150 kN/m per unit length. The gross bearing capacity of the soil is 100 kN/m2. Use M20 grade concrete and Fe 415 HYSD. Assume suitable data.
7
Design reinforced concrete slab for a room measuring 5 m x 5 m. The slab is to rest upon 11/2 brick thick walls constructed all round. The flooring is to consist of 25 mm thick cement concrete layer. The flooring may be assumed to be subjected to a uniformly distributed super imposed load of 4kN/m2.The following data may be assumed in the design: Use M 20 grade of concrete and Fe 415 grade steel. Draw a cross section of the designed slab showing clearly the bar bending schedule of the reinforcement. *****
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2
Code: 9A01501
III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall.
1
(a) (b)
2
(a) (b)
3
(a)
(b)
D L
How the effective width of flange of a T-beam & L- beam is determine? A RC floor slab of 120 mm thick is ed by T-beam at 3.2 m intervals c/c. the slab carries a total superimposed load of 3.5kN/m2 in addition to its self weight. The effective span of T-beams is 9.6 m. Design the beam using M 20 grade concrete and Fe 415 grade steel. Part B (Answer any three questions, 3 x 14 marks) What is a bond stress? Explain what will happen if bond stress exceeds the allowable limit? What are the steps taken to keep the bond stress within allowable limits? If the beam is simply ed at what section is the bond stress maximum. Determine the shear carrying capacity of : (i) 8 mm Φ 2 legged vertical stirrups of mild steel provided at 200 mm centers and (ii) 8 mm Φ 2 legged inclined stirrups of mild steel provided at 200 mm centers with 450 inclinations to the axis of the beam if the effective depth of the beam is 540 mm. (iii) 8 mm Φ 2 legged inclined stirrups of mild steel provided at 200 mm centers with 600 inclinations to the axis of the beam if the effective depth of the beam is 500 mm. Draw the drawing for each case.
R O
W U
T N
J
Consider a square column,400 mm x 400 mm, with 4-25 Φ bars at corners placed with a clear cover of 45 mm, and lex=ley=12 D, subjected to axial loading conditions. Determine the maximum factored axial load Pu that the column can safely carry considering: (a) Short column behavior under axial loading, assuming l=12 D; (b) Short column behavior under biaxial loading with minimum eccentricities: (c) Slender column behavior (considering’ additional eccentricities’ alone). Comment on the result obtained. Assume M20 concrete and Fe415 steel. Draw the drawings showing the design details.
4
5
Part A (Answer any one question, 1 x 28 marks) ***** Explain the basis for the selection of partial safety and load factors recommended by the IS:456 for serviceability limit states Explain briefly about the codal recommendations for limit states design as per IS 456 – 2000.
(a) (b)
Explain with necessary sketches how an isolated RC footing is checked against the transverse and punching shears. Briefly explain the conditions in which transfer of forces at the interface of the column (or pedestal) and footing can be achieved without the aid of reinforcement. Contd. in Page 2 Page 1 of 2
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2
Code: 9A01501
6
Design a cantilever slab for a clear projection of 1.8m using M25 grade concrete and mild steel. Live load may be taken as 2000 N/m2. Weight of the weathering course is 1000 N/m2.
7
Check whether the following arrangements of reinforcement satisfy the bars spacing rules in beams shown below assume that cover is 40 mm. Indicate any modification that should be made 650
300
3T 20
400
R O
W U *****
D L
1500
5T 32
Page 2 of 2
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J
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Code: 9A01501
III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall.
1
(a) (b)
2
3
Part A (Answer any one question, 1 x 28 marks) ***** The concept of locating the neutral axis as a centroidal axis (in a reinforced concrete beam section under flexure) is applied in WSM, but not in LSM. Why? Why is it uneconomical to use high strength steel as compression reinforcement in design by WSM?
D L
The roof slab of a cycle stand having a uniform thickness 80 mm is ed by a central T-beam on an effective span of 8 m. The slab has clear over hangs of 1.2 m on either side of the web of beam which is 250 mm wide. Live load on the slab is 750 N/m2. Design the mid span of the T-beam using concrete grade M25 and steel grade Fe 415 taking the maximum sagging moments as W L2/10. Part B (Answer any three questions, 3 x 14 marks) A simply ed T-beam has the following details: Breadth of the flange=2500 mm; Thickness of the flange = 130 mm; Breadth of rib = 350 mm; Depth of rib = 400 mm; Effective span = 10 m. Total udl = 55 kN/m; Grade of concrete = M 25; Tension reinforcement at mid span = 8 nos. 20 mm Φ Fe 415 grade steel bars; Clear cover to reinforcement = 35 mm. Suggested suitable shear reinforcement for the maximum shear in the beam.
R O
W U
T N
J
4
Design a square column 7 m long to carry a load of 400 kN if its size is restricted to 40 cm. both ends of the column are hinged. Use helical reinforcement. Use M 20 concrete and Fe415 steel.
5
Design a square footing for a square column 400 mm x 400 mm, reinforced with 6-25 Φ bars, and carrying a service load of 1150 kN. Assume soil with an allowable pressure of 210kN/m2 at a depth of 1.4 m below ground. Assume Fe 415 grade steel and M 25 for both column and footing. Contd. in Page 2 Page 1 of 2
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3
Code: 9A01501
6
7
A hall 6 m x 8 m is to be covered with RC slab. Design suitable thickness of the slab and the reinforcement. The dead load on the slab consists of 75 mm earth of density 12kN/cu.m. And tiles 40 mm thick (density of tiles=15kN/cu.m). Assume live load of 1kN/sq.m. use M 20 & Fe 415 (a)
What is the magnitude of crack width allowed in concrete structures?
(b)
Check whether the following arrangements of reinforcement satisfy the bars spacing rules in beams shown below assume that cover is 40 mm Indicate any modification that should be made. 650
300
3T 20
D L
400 5T 32
R O
W U
T N
*****
Page 2 of 2
J
www.jntuworld.com
1500
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www.jwjobs.net
4
Code: 9A01501 III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall. Part A (Answer any one question, 1 x 28 marks) ***** 1 Enumerate the five limit states commonly used in limit state design and state briefly how they are provided for in design. 2
3
A portico slab of clear projections 3 m and length 5 m is ed by two cantilevered inverted T-beams at 3 m centers with equal overhangs of slab. Thickness of slab is 100 mm. Imposed load on the slab is 4kN/m2. Breadth of rib of T-beams is 250 mm. Design the section of the beam for bending using M25 grade concrete and mild steel.
(a) (b)
4
D L
Part B (Answer any three questions, 3 x 14 marks) What are the advantages and disadvantages to inclined stirrups over vertical stirrups A simply ed beam of effective span 6 m and M20 grade concrete carries an udl of 25kN/m. The overall size of the beam is 230 mm x 500 mm. It has 4 bars in the tension zone and 4 bars in the compression zone all of 18 mm dia. Fe415 grade steel without any curtailment or crank. Design the shear reinforcement for full length of the beam using mild steel.
R O
W U
A seven-storied building has a floor-to-floor height of 4.2 m and a plan area of 24 m x 36 m with columns spaced at 6 m intervals in the two directions. Assume that all columns have a size 450 mm x 450 mm with M25 concrete and all primary beams have a size 300 mm x 600 mm with M20 concrete. (a) Determine the stability indicates of the structure in the transverse and longitudinal directions, considering the second storey. Assume a total disturbed load of 50kN/m2 from all the floors above combined. (b) Determine the effective lengths of a corner column in the second storey.
T N
J
5
An RC column of 300 mm x 200 mm size carries an axial load of 450kN. Design a rectangular footing of uniform thickness using M20 grade concrete and Fe415 grade steel if the safe bearing capacity of soil is 125kN/m2. Keep the projections of footing beyond the faces of the column equal in both directions.
6
The internal dimension of a small hall with 30 cm thick walls on four sides is 4.5 m x 6.5 m. Design a suitable RC roof slab to span in two directions and to be capable of carrying a live load of 8kN/m2. Take the slab to be simply ed on all four sides. Allow 1.8kN/m2 for insulation and water proofing treatment. Sketch the details of the slab showing reinforcement and add a bar bending schedule.
7
A cantilever beam of span 5 m is subjected to a working superimposed dead load of 10kN/m and live load of 15kN/m. The beam is made of M20 concrete and HYSD-Fe415 bars. Design the beam by limit state design with a width equal to 300 mm and compute the deflection due to live load *****
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1
Code: 9A01501 III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall. Part A (Answer any one question, 1 x 28 marks) ***** 1 Design a RC cantilever beam with tension steel only to carry a super imposed load of 10kN/m over a clear span of 3.5 m with a uniform breadth of 300 mm overall depth of beam at the free end is to be 300 mm. Permissible stresses in concrete and steel are 7 N/mm2 and 190 N/mm2. 2
(a) (b)
3
(a)
(b)
4
5
What is meant by limit state? Discuss the different ‘limit states’ to be considered in reinforced concrete design. Why is the partial safety factor for concrete (γc) greater than that for reinforcing steel (γs) in the consideration of ultimate limit states? Part B (Answer any three questions, 3 x 14 marks) A RC floor slab of 100 mm thick is ed by T-beam at 3 m intervals c/c. The slab carries a total superimposed load of 3 kN/m2 in addition to itself weight. The effective span of T-beams is 9 m. Design the beam using M20 grade concrete and Fe 415 grade steel. Determine the moment capacity of a doubly-reinforced rectangular cross-section beam for the following data: b = 350 mm, d = 700 mm, Ast=1400 mm2, fy = 415 N/mm2, fck=25 N/mm2, ASC=650 mm2.
D L
R O
W U
The critical section of an RC rectangular beam is subjected to a bending moment of 28 kNm, a torsional moment of 15 kNm and a shear force of 32 kN. The overall size of the section is 350 mm x 700 mm. provide effective cover to reinforcement as 50 mm. concrete grade M 25 and steel grade Fe 415 are used. Design the necessary reinforcements for the section. Draw the drawings showing the design details. (a) (b)
T N
Explain the limitations of the traditional limit state method with regard to the design of axially loaded reinforced concrete columns. Design the reinforcement in a column of size 300 mm x 450 mm, with an uned length of 6.0 m, subjected to a factored axial load of 1150 kN. Assume the column to be braced, and pinned at both ends in both end directions. Assume M20 concrete and Fe415 steel, and design by: (i) Strength reduction coefficient method. (ii) Additional moment method.
J
6
Design a footing of a brick wall 30 cm thick which is transmitting a load of 150 kN/m per unit length. The gross bearing capacity of the soil is 100 kN/m2. Use M20 grade concrete and Fe 415 HYSD. Assume suitable data.
7
Design reinforced concrete slab for a room measuring 5 m x 5 m. The slab is to rest upon 11/2 brick thick walls constructed all round. The flooring is to consist of 25 mm thick cement concrete layer. The flooring may be assumed to be subjected to a uniformly distributed super imposed load of 4kN/m2.The following data may be assumed in the design: Use M 20 grade of concrete and Fe 415 grade steel. Draw a cross section of the designed slab showing clearly the bar bending schedule of the reinforcement. *****
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2
Code: 9A01501
III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall.
1
(a) (b)
2
(a) (b)
3
(a)
(b)
D L
How the effective width of flange of a T-beam & L- beam is determine? A RC floor slab of 120 mm thick is ed by T-beam at 3.2 m intervals c/c. the slab carries a total superimposed load of 3.5kN/m2 in addition to its self weight. The effective span of T-beams is 9.6 m. Design the beam using M 20 grade concrete and Fe 415 grade steel. Part B (Answer any three questions, 3 x 14 marks) What is a bond stress? Explain what will happen if bond stress exceeds the allowable limit? What are the steps taken to keep the bond stress within allowable limits? If the beam is simply ed at what section is the bond stress maximum. Determine the shear carrying capacity of : (i) 8 mm Φ 2 legged vertical stirrups of mild steel provided at 200 mm centers and (ii) 8 mm Φ 2 legged inclined stirrups of mild steel provided at 200 mm centers with 450 inclinations to the axis of the beam if the effective depth of the beam is 540 mm. (iii) 8 mm Φ 2 legged inclined stirrups of mild steel provided at 200 mm centers with 600 inclinations to the axis of the beam if the effective depth of the beam is 500 mm. Draw the drawing for each case.
R O
W U
T N
J
Consider a square column,400 mm x 400 mm, with 4-25 Φ bars at corners placed with a clear cover of 45 mm, and lex=ley=12 D, subjected to axial loading conditions. Determine the maximum factored axial load Pu that the column can safely carry considering: (a) Short column behavior under axial loading, assuming l=12 D; (b) Short column behavior under biaxial loading with minimum eccentricities: (c) Slender column behavior (considering’ additional eccentricities’ alone). Comment on the result obtained. Assume M20 concrete and Fe415 steel. Draw the drawings showing the design details.
4
5
Part A (Answer any one question, 1 x 28 marks) ***** Explain the basis for the selection of partial safety and load factors recommended by the IS:456 for serviceability limit states Explain briefly about the codal recommendations for limit states design as per IS 456 – 2000.
(a) (b)
Explain with necessary sketches how an isolated RC footing is checked against the transverse and punching shears. Briefly explain the conditions in which transfer of forces at the interface of the column (or pedestal) and footing can be achieved without the aid of reinforcement. Contd. in Page 2 Page 1 of 2
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2
Code: 9A01501
6
Design a cantilever slab for a clear projection of 1.8m using M25 grade concrete and mild steel. Live load may be taken as 2000 N/m2. Weight of the weathering course is 1000 N/m2.
7
Check whether the following arrangements of reinforcement satisfy the bars spacing rules in beams shown below assume that cover is 40 mm. Indicate any modification that should be made 650
300
3T 20
400
R O
W U *****
D L
1500
5T 32
Page 2 of 2
T N
J
www.jntuworld.com
www.jntuworld.com
www.jwjobs.net
3
Code: 9A01501
III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall.
1
(a) (b)
2
3
Part A (Answer any one question, 1 x 28 marks) ***** The concept of locating the neutral axis as a centroidal axis (in a reinforced concrete beam section under flexure) is applied in WSM, but not in LSM. Why? Why is it uneconomical to use high strength steel as compression reinforcement in design by WSM?
D L
The roof slab of a cycle stand having a uniform thickness 80 mm is ed by a central T-beam on an effective span of 8 m. The slab has clear over hangs of 1.2 m on either side of the web of beam which is 250 mm wide. Live load on the slab is 750 N/m2. Design the mid span of the T-beam using concrete grade M25 and steel grade Fe 415 taking the maximum sagging moments as W L2/10. Part B (Answer any three questions, 3 x 14 marks) A simply ed T-beam has the following details: Breadth of the flange=2500 mm; Thickness of the flange = 130 mm; Breadth of rib = 350 mm; Depth of rib = 400 mm; Effective span = 10 m. Total udl = 55 kN/m; Grade of concrete = M 25; Tension reinforcement at mid span = 8 nos. 20 mm Φ Fe 415 grade steel bars; Clear cover to reinforcement = 35 mm. Suggested suitable shear reinforcement for the maximum shear in the beam.
R O
W U
T N
J
4
Design a square column 7 m long to carry a load of 400 kN if its size is restricted to 40 cm. both ends of the column are hinged. Use helical reinforcement. Use M 20 concrete and Fe415 steel.
5
Design a square footing for a square column 400 mm x 400 mm, reinforced with 6-25 Φ bars, and carrying a service load of 1150 kN. Assume soil with an allowable pressure of 210kN/m2 at a depth of 1.4 m below ground. Assume Fe 415 grade steel and M 25 for both column and footing. Contd. in Page 2 Page 1 of 2
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3
Code: 9A01501
6
7
A hall 6 m x 8 m is to be covered with RC slab. Design suitable thickness of the slab and the reinforcement. The dead load on the slab consists of 75 mm earth of density 12kN/cu.m. And tiles 40 mm thick (density of tiles=15kN/cu.m). Assume live load of 1kN/sq.m. use M 20 & Fe 415 (a)
What is the magnitude of crack width allowed in concrete structures?
(b)
Check whether the following arrangements of reinforcement satisfy the bars spacing rules in beams shown below assume that cover is 40 mm Indicate any modification that should be made. 650
300
3T 20
D L
400 5T 32
R O
W U
T N
*****
Page 2 of 2
J
www.jntuworld.com
1500
www.jntuworld.com
www.jwjobs.net
4
Code: 9A01501 III B. Tech I Semester (R09) Regular & Supplementary Examinations, November 2012 DESIGN & DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering) Time: 3 hours Max Marks: 70 Use of IS 456-2000, IS-800 code books to be permitted in the examination hall. Part A (Answer any one question, 1 x 28 marks) ***** 1 Enumerate the five limit states commonly used in limit state design and state briefly how they are provided for in design. 2
3
A portico slab of clear projections 3 m and length 5 m is ed by two cantilevered inverted T-beams at 3 m centers with equal overhangs of slab. Thickness of slab is 100 mm. Imposed load on the slab is 4kN/m2. Breadth of rib of T-beams is 250 mm. Design the section of the beam for bending using M25 grade concrete and mild steel.
(a) (b)
4
D L
Part B (Answer any three questions, 3 x 14 marks) What are the advantages and disadvantages to inclined stirrups over vertical stirrups A simply ed beam of effective span 6 m and M20 grade concrete carries an udl of 25kN/m. The overall size of the beam is 230 mm x 500 mm. It has 4 bars in the tension zone and 4 bars in the compression zone all of 18 mm dia. Fe415 grade steel without any curtailment or crank. Design the shear reinforcement for full length of the beam using mild steel.
R O
W U
A seven-storied building has a floor-to-floor height of 4.2 m and a plan area of 24 m x 36 m with columns spaced at 6 m intervals in the two directions. Assume that all columns have a size 450 mm x 450 mm with M25 concrete and all primary beams have a size 300 mm x 600 mm with M20 concrete. (a) Determine the stability indicates of the structure in the transverse and longitudinal directions, considering the second storey. Assume a total disturbed load of 50kN/m2 from all the floors above combined. (b) Determine the effective lengths of a corner column in the second storey.
T N
J
5
An RC column of 300 mm x 200 mm size carries an axial load of 450kN. Design a rectangular footing of uniform thickness using M20 grade concrete and Fe415 grade steel if the safe bearing capacity of soil is 125kN/m2. Keep the projections of footing beyond the faces of the column equal in both directions.
6
The internal dimension of a small hall with 30 cm thick walls on four sides is 4.5 m x 6.5 m. Design a suitable RC roof slab to span in two directions and to be capable of carrying a live load of 8kN/m2. Take the slab to be simply ed on all four sides. Allow 1.8kN/m2 for insulation and water proofing treatment. Sketch the details of the slab showing reinforcement and add a bar bending schedule.
7
A cantilever beam of span 5 m is subjected to a working superimposed dead load of 10kN/m and live load of 15kN/m. The beam is made of M20 concrete and HYSD-Fe415 bars. Design the beam by limit state design with a width equal to 300 mm and compute the deflection due to live load *****
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