RCC and PSC MODEL QUESTION PAPER CIVIL DIPLOMA 5TH SEMESTER


RCC and PSC   MODEL QUESTION PAPER CIVIL DIPLOMA 5TH SEMESTER

Format of Model Question Paper for CIE(Tests)


Test/Date and Time

Semester/year

Course/Course Code

Max Marks

Ex: I Test/6 th week of sem 10-11 Am

Sem : V SEM

Course : RCC and PSC

 

20

Year : 2016-17

Course code:15CE51T

Name of Course coordinator :

Course outcome :CO1, CO2                                                            Note: Answer all questions

Q

No

Question

M

CL

CO

PO

1

List the basic assumption of design for limit state of collapse in flexure.

3

R

1

1,

2

2

Differentiate between under reinforced section and balanced section(Limiting section)

4

U

1

1,

2

3

An RCC rectangular beam of size 230X600mm overall is to carry a super imposed load of 40KN/m over an effective span of 6m. Find the area of tension and compression reinforcement. Use M20 & Fe500 steel. Take effective cover 40mm on both sides.

OR

Find the ultimate moment of a T-beam from the following sectional properties. Use M15 & Fe415 steel.

å         Width of flange = 1500mm

å         Thickness of flange = 100mm

å         Overall depth of beam = 600mm

å         Width of rib or web = 300mm

å   Ast = 2455mm2

å         Effective cover = 40mm

 

 

 

 

 

 

6

 

 

 

 

 

U/ A

y

 

 

 

 

 

 

1

 

 

 

 

1,

2,

4,

5,

7

4

Design a singly reinforced beam of clear span 6m to support a working live load of 15KN/m. Use M20 & Fe500 steel. Sketch the reinforcement details.

OR

 

Design a cantilever beam of clear span 3.5m to support a working live load of 15KN/m. Use M20 & Fe500 steel. Sketch the reinforcement details.

 

 

 

7

 

 

U/ A

p

 

 

 

2

 

1,

2,

6,

7



TEXT BOOKS
1. Ashok K. Jain,Reinforced Concrete by Limit State Design by Nem Chand & Bros, Roorkee.
2. UNNIKRISHNAN PILLAI AND DEVADAS MENON, Design Of Reinforced Concrete Structures –Tata McGraw Hill Publications.
3. Design of reinforced concrete structures by Krishna raju
4. Limit state design of concrete structural elements –TTTI (NITTTR), Chennai
5. Minocha&Diwedi, Design of R.C.C. Structures, B. Bharat Prakshain, Merrut.
6. S.K. Mallick, Reinforced Concrete, Oxford & IBH Publshing Co., Delhi.
7. Design of reinforced concrete structures by P.C. Varghees
8. Design of Reinforced Concrete Structures by S Ramamrutham& R Narayan
 
9. Theory & design of RCC Structures by Gurucharan Singh
10. Reinforced Concrete Structures by B C Punmia
11. Treasure of RCC Designs by Sushil Kumar S
12. SP-16 Design aid for IS 456-2000, SP-23 Hand book on concrete mixes
13. IS 875-1987 Loading standards, SP-34 Detailing of RC Structures

REFERENCES
1. Punmia B.C., Limit State Design of Reinforced Concrete, Laxmi Publication (P), Delhi.
2. Raju N.K., Reinforced Concrete Design IS 456 – 2000 Principles & Practice, New Age International Publishers, New Delhi.
3. BIS, IS 456 – 2000 Code of Practice for Plain & Reinforced Concrete.
4. SINHA S N, Reinforced Concrete Design, Tata McGraw Hill Publications
5. KARVE S R AND SHAH V L, Limit State Theory And Design Of Reinforced Concrete – Vidyarthi Prakashan, Pune
6. PARK AND PAULAY, Reinforced Concrete, John Wiley and Sons

E-Learning
https://books.google.co.in/books?id=o_mKzwhbeHkC&pg=PR9&lpg=PR9&dq=introduction+to
+limit+state+design+IS+456-2000 https://www.youtube.com/watch?v=Grv09rIAPQM https://youtu.be/Grv09rIAPQM
http://freevideolectures.com/Course/2686/Design-of-Reinforced-Concrete-Structures# https://youtu.be/hxakW1miEcM
https://www.google.co.in/url?-to-design-rcc-column-in-limit-state. https://www.google.co.in/url? concrete&usg=AFQjCNFmUZeUdmDxV3VSLCsQsKFf5f5V-w


Guidelines to the paper setter

Part-A : Answer any 5 questions. Each question carries 5 marks.

Part-B : Answer any 5 questions, two questions from each section. Each question carries 15 marks.

Part-A :

Q1, Q2, Q3, Q4, Q5 are based on RCC theory. Q6, Q7, Q8 are based on PSC.

Part-B :

Section-I :

Q9, Q10, Q11 based on analysis of SR, DR and T-beams.

 

Section-II :

Q12 based on design of SR beam or DR beam

Q13 based on design of Lintel or One way slab or Staircase.

Q14 based on design of One way continuous slab or Two way unrestrained or Two way restrained.

Q15 based on design of Columns or design of column by using SP 16 charts or design of column Footing.


Note :
In analysis problems, Ast is calculated by using codal formula by solving quadratic equation.
In design problems Ast is calculated by using tables.
IS 456-2000 & SP16 is permitted in the examination only original copy or hard bound xerox copy attested by head of the institution.

MODEL QUESTION PAPER
Diploma in Civil Engineering
5TH Semester
REINFORCED CEMENT CONCRETE
Time: 3Hrs. Max Marks: 100
Note: IS 456-2000 & SP16 is permitted in the examination only original copy or hard bound xerox copy attested by head of the institution.
Part –A
Answer any 5 questions 5X5=25 Marks
1) Explain interaction diagram in the design of column.
2) Explain characteristic strength of material, characteristic load and partial safety factor.
3) Define Neutral axis, Limiting neutral axis, moment of resistance, Lever arm, Effective depth.
4) Distinguish between singly reinforced and doubly reinforced sections.
5) Differentiate between short column and long column.
6) Explain the principle of prestressing.
7) Difference between pre-tensioned and post-tensioned members.
8) Mention the systems of pre-stress and its losses.

Part –B
Answer any 5 questions, atleast TWO questions from each section 5X15=75 Marks Section –I
1) An RCC rectangular beam of 200X500mm overall is used as a SS beam of an effective span of 6m. It is reinforced with a tensile steel of 4000mm2. What maximum UDL can be allowed on the beam. Take effective cover 35mm. Use M20 & Fe415 steel.
2) An RCC rectangular beam of size 230X600mm overall is to carry a super imposed load of 40KN/m over an effective span of 6m. Find the area of tension and compression reinforcement. Use M20 & Fe500 steel. Take effective cover 40mm on both sides.
3) A T-beam of depth 450mm has a flange width of 1000mm and depth of 120mm. It is reinforced with 6 of 20mmɸ as tension steel with a clear cover of 30mm. Use M20 & Fe415 steel. Find Mu and super imposed UDL. Take bw= 300mm.
Section –II
1) Design a singly reinforced beam of clear span 6m to support a working live load of 15KN/m. Use M20 & Fe500 steel. Sketch the reinforcement details.
2) The main stair of an office building has to be located in a hall measuring 3.3mX5.5m. The vertical distance between the floor is 3.6m. Design the stairs. The LL on the stair is 4KN/m2. Use M20 grade concrete and Fe415 steel.
3) Design a slab over a room of internal dimensions 4mX5m supported on 230mm thick brick wall all the edges are simply supported (the corners of the slab is held down). Live load on slab 3KN/m2, floor finish 1KN/m2. Take M20 concrete and Fe415 steel. Sketch the reinforcement details.
4) Design a rectangular footing for a column of size 300X500mm supporting an axial factored load of 1500KN. SBC of soil 200KN/m2. Use M20 & Fe415 steel.


Model Questions Bank

Unit 1-Introduction:

Cognitive level –Remember

ÿ  Explain briefly limit state method of designing RC structures.

ÿ  List the basic assumption of design for limit state of collapse in flexure.

ÿ  Explain characteristic strength, characteristic load and partial safety factor.

ÿ  What are serviceability requirements satisfied by designing an RC structures?

ÿ  Explain the concept of shear in beams and mention its types.

ÿ  What is meant by development length and mention the codal provisions ?

ÿ  What is meant by curtailment of tension reinforcement ?

ÿ  Write a short note on cracking in structural concrete members.

ÿ  Write the effective flange width of an intermediate T-beam and an isolated T-beam.

ÿ  Explain yield line theory concept in slabs.

ÿ  Define the terms: One way slab, Restrained two way slab, Unrestrained  two  way  slab, Cantilever slab, Continuous slab, Flat slab.

ÿ  Define the terms: Axially loaded, Eccentrically loaded column.

ÿ  Define the terms: Positive reinforcement, negative reinforcement, shear reinforcement, torsional reinforcement, lateral reinforcement, side face reinforcement.

Cognitive level –Understand

ÿ  Define Neutral axis, Limiting neutral axis, moment of resistance, Lever arm, Effective depth.

ÿ  Differentiate between under reinforced section and balanced section(Limiting section).

ÿ  Differentiate between analysis and design of an RC structure.

ÿ  List the different types of shear failure and how it is prevented.

ÿ  What are the factors which affects short term and long term deflection ?

ÿ  Distinguish between singly reinforced and doubly reinforced sections.

ÿ  List the conditions under which doubly reinforced beams are preferred.

ÿ  What are the advantages of a T-beam over a rectangular beam.

ÿ  Distinguish between T-beam and L-beam.

ÿ  Distinguish between a beam and a Lintel.

ÿ  Differentiate between one way slab and two way slab.

ÿ  Mention the section at which Max span moment, support moment, shear force occurs in case of a continuous slab or a beam.

ÿ  Under what conditions a slab is designed as two way.

ÿ  Differentiate between short column and long column.

ÿ  What are the points to be considered while designing long columns?

ÿ  Differentiate between uniaxial bending and bi-axial bending.

Cognitive level –Analysis


Unit 2- Design of Beams

Cognitive level –Application

Design of Singly reinforced Beams

 

Given – Clear span, bearing, super imposed UDL, end condition(SS & cantilever), grade of concrete or Exposure condition of concrete, grade of steel.

To find – Design the beam for flexure and shear. Check for deflection. Typical Problem:

ÿ  Design a singly reinforced beam of clear span 6m to support a working live load of 15KN/m.

Use M20 & Fe500 steel. Sketch the reinforcement details.

 

ÿ  Design a cantilever beam of clear span 3.5m to support a working live load of 15KN/m. Use M20 & Fe500 steel. Sketch the reinforcement details.

 

Design of Doubly reinforced Beams

 

Given – Clear span, bearing, super imposed UDL, Size of beam, effective cover on both sides, grade of concrete or Exposure condition of concrete, grade of steel.

To find – Design the beam for flexure (Find Ast and Asc) Typical Problem:

ÿ Design a simply supported beam of effective span 8m is subjected to an UDL of 35KN/m. Size of the beam is restricted to 300X700mm with an effective cover of 50mm. Use M20 & Fe500 steel. Sketch the reinforcement details.


Unit 3- Design of Slabs

 

Cognitive level –Application

 

Design of One way Slab

Typical Problem:

ÿ  A room has clear dimension 7mX3m. The live load on the slab is 3KN/m2 and floor finish load of 1KN/m2 using M20 grade concrete and Fe 415 steel. The slab is supported on 230mm thick wall.

 

Design of One way continuous Slab

Typical Problem:

ÿ  Design a one way continuous two span slab of effective span 4.5m each. The live load on the slab is 3KN/m2 and a floor finish(imposed dead load) of 1.5KN/m2. Use M20 grade concrete and Fe 500 grade steel.

ÿ  Design a continuous slab for an office floor. The slab is continuous over beams spaced at 4m c/c. It carries an imposed dead load of 1 kN/m2and a live load of 4kN/m2. Assume width of rib as 230mm. Use M20 grade concrete and Fe415 steel. (Design the slab for the maximum moment which occurs at support next to the end support). Take l/d ratio as 30 and sketch the reinforcement details.

 

Design of Two way slab (Corners are not held down)

Typical Problem:

ÿ  Design a slab over a room of internal dimensions 4mX5m supported on 230mm thick brick

wall having a live load of 2KN/m2, floor finish 1KN/m2. All the edges are simply supported (The corners are free to lift). Take M20 concrete and Fe415 steel. Sketch the reinforcement

details.

ÿ  A slab over a room is 5mX5m. The edges of the slab is simply supported on all the sides and corners are not held down. The live load on the slab is 3KN/m2, the slab has a bearing of 230mm on the supporting walls. Assume exposure condition to environment can be classified as mild. Grade of steel Fe415, design the slab.

 

Design of Two way slab (Corners are held down)

Typical Problem:

ÿ  Design a slab over a room of internal dimensions 4mX5m supported on 230mm thick brick wall all the edges are simply supported (the corners of the slab is held down). Live load on slab 3KN/m2, floor finish 1KN/m2. Take M20 concrete and Fe415 steel. Sketch the reinforcement details.



Unit 4- Design of Column and Footings

Cognitive level –Application



Design of Axially loaded short Column

 

Type 1 :

Given - Size of column, Asc, grade of concrete & steel To find – Ultimate and Working load.

 

Typical Problem:

ÿ A reinforced concrete short square column of size 300mm is reinforced with 4 bars of 20mmɸ.

Find the ultimate load capacity of the column using M20 & Fe415 steel. What will be the allowable service load?

 

Type 2 :

Given – Working axial load, shape of the column, grade of concrete & steel, assume Asc=0.8 to 6% To find – Size of column and Asc

 

Typical Problem:

ÿ Design an RCC rectangular short column to resist an axial load of 800KN. Use M20 concrete and Fe415 steel. Assume 0.8% steel of column area.

 

Type 3 :

Given – Size and shape of column, axial working load, effective length, grade of concrete & steel To find – Asc and Percentage of steel

 

Typical Problem:

ÿ  Design necessary reinforcement for an RCC column of size 400X600mm to carry an axial working load of 2000KN. The effective length of the column is 3m. Use M20 & Fe415 steel.

 

ÿ  Design a circular column of diameter 450mm subjected to a load of 1200 KN. The column is having lateral ties. The column is 3m long and is effectively held in position at both ends but not restrained against rotation. Use M25 concrete and Fe415 steel.

 

Design of uniaxial short Column

ÿ  Determine the reinforcement to be provided in  a  square column  subjected to  uniaxial bending with the following data :

å         Size of the column = 450X450mm

å         Grade of concrete = M25

å         Grade of steel = 500N/mm2

å         Factored load = 2500kN

å         Factored moment = 150kN-m

å         Arrangement of reinforcement = On two sides.

Assume 25mm bars with 40mm cover.

 

ÿ  Design the column from the following details using SP 16 charts.

å         Size of column = 300X450mm

å    Pu=1200KN

å         Assume d’=50mm

å         Mu=150kN-m

å         Use M25 and Fe415 steel. Provide reinforcement distributed equally on two sides.

 

Design of Isolated Footing (Sqaure& Rectangle)

 

Given - Size of column, Column load, SBC, grade of concrete & steel

To find – Design the size of footing, depth of footing , Ast, check for One way & Two way shear.

 

Typical Problem:

ÿ  Design a square footing to carry a column load of 1100KN from a 400X400mm column. The SBC of the soil is 100KN/m2. Use M20 & Fe415 steel.

 

ÿ  Design a rectangular footing for a column of size 300X500mm supporting an axial factored load

irectoraotfe1O50f0TKeNch. SnBicCaloEf sdouilc2a0ti0oKnN/m2. Use M20 & Fe415 steel.                                                                                                            Karnataka State



Unit 5- Design of Staircase & Lintels

Cognitive level –Application

Design of Staircase

Typical Problem:

ÿ The main stair of an office building has to be located in a hall measuring 3.3mX5.5m. The

vertical distance between the floor is 3.6m. Design the stairs. The LL on the stair is 4KN/m2.

Use M20 grade concrete and Fe415 steel.

Design of Lintels

Typical Problem:

ÿ Design a lintel using the following data:

å

Width of opening = 2.4m

å

Height of brick wall above lintel = 4m

å

Thickness of wall = 230mm

å

Bearing = 230mm

å

Grade of concrete = M20

å

Grade of steel = Fe415,

å

Density of brick wall = 19.2KN/m3

Check for flexure and shear. Sketch the reinforcement details.

ÿ Design a lintel using the following data :

å

Width of opening = 2.4m

å

Height of brick wall above lintel = 1.5m

å

Thickness of wall = 230mm

å

Grade of concrete = M20

å

Grade of steel = Fe415,

å

Density of brick wall = 19.2KN/m3

Check for flexure and shear. Sketch the reinforcement details.

 

Unit 6- Pre-Stressed Concrete

Cognitive level –Remember

ÿ

Explain the principle of prestressing.

ÿ

What are the advantages and disadvantages of prestressing?

ÿ

Explain the grades of concrete and steel used in PSC.

ÿ

Mention the systems of pre-stress and its losses.

Cognitive level –Understand

ÿ

Distinguish between RCC and PSC.

ÿ

Difference between pre-tensioned and post-tensioned members.

ÿ

Under what circumstances PSC members are preferred.



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