STEEL STRUCTURES DESIGN 6th ’19 Duration: 3Hrs. …

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STEEL STRUCTURES DESIGN

6th Exam/Civil/5130/Nov’19

Duration: 3Hrs. M.Marks:75

Note: Use of IS: 800 and Steel Tables are permitted in examination.

SECTION-A

Q1. a) Fill in the blanks. 15x1=15

i. ISSB stands for ________.

ii. Fe 410-S is designated for__________ grade of steel.

iii. Rivets are used as __________fastening.

iv. Nominal diameter od rivet is also called _________.

v. Types of weld are__________ and .

vi. The minimum size of fillet weld for 10mm plate is __________.

vii. The members subjected to direct tension are called __________.

viii. Slenderness ratio is expressed as ratio of __________.

ix. Roof truss are economical for span more than__________.

x. Long columns fail due to __________ .

b) State True or False.

xi. T section has two flanges.

xii. Testing of welded joints is difficult.

xiii. Strength of tension members = Net area*

xiv. Permissible tensile stress.

xv. Strut is a member in tension.

xvi. Channel section can be used as purlins.

SECTION-B

Q2. Attempt any five questions. 5x6=30

a) Explain the mechanical properties of steel.

b) Explain the types of fillet weld.

c) What are the various steps involved in design of tension member?

d) Explain various conditions for continuous and discontinuous strut based upon end con

e) Explain span, pitch, slope, principal rafter and purlin.

f) How the columns are classified based upon their length?

g) How beams are different from columns?

h) Explain various types of angle struts used in trusses

SECTION-C

Q3. Attempt any three questions. 3x10=30

i. Calculate rivet value of an 18 mm diameter power driven filed rivet (PDFR) which

connects two 8mm thick plates to a 10 mm thick plate one either side of it.

ii. A gusset plate 8 mm thick is to be connected to a tie bar 80mm 6mm by fillet weld

parallel to the load applied taking the permissible tensile stress to be 150 N/mm and shear

stress as 102.5 N/mm. Design suitable size weld for full strength to tie bar.

iii. Determine the strength of ISHT 75 which is used as tie member. It is connected

through flanges by means of 20 mm dia rivet. Assume permissible tensile stress to be 150

N/mm.

iv. Calculate the moment of resistance of rolled steel beam ISLB 500 @735.7 N/m.

Assume permissible bending stress as 165 MPa.

v. Calculate the load carrying capacity of ISMB 4002604 N/m to be used as column.

The effective length of column is 4m

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6th Exam/Civil/5130/May’19


Note: Use of IS: 800 and Steel Tables are permitted in examination.

SECTION-A


i. According to IS 800:1984, Maximum Permissible tensile stress in Steel

Sections is ________× fy.

ii. In IS 800: 1984, Symbol fy represents __________ stress in steel.

iii. For 28mm diameter rivet, the diameter of rivet hole will be __________.

iv. Sectional area of “ISLC 150 @ 141.3 N/m” is __________ mm².

v. For 75° Fusion Angle the Effective throat thickness of 6mm welds

is__________ mm.

vi. Maximum pitch in rivets shall not exceed __________.

vii. Increase in carbon content in steel cause __________.

viii. ΣV = 0, ΣH = 0 and ΣM = 0 are called __________.

ix. In plate girder Bearing stiffeners are provided at__________.

x. Zero bending stress occurs at __________ of beam.


xvii. Beam is a flexural member.

xviii. For Power Driven Shop Rivets (PDSR) allowable shear stress is 100N/mm²

xix. Minimum Pitch Distance in Rivets shall be two times of rivet diameter.

xx. Brittle Failure is not possible in Welding.

xxi. Strut is a member subjected to an axial pull.

SECTION-B

Q2. Attempt any five questions. 5x6=30

a. Draw neat and labeled sketches of Lap Joint, Single Cover Butt Joint &

Double cover Butt Joint with Riveted Connections.

b. Calculate minimum numbers of rivets required to connect a 14mm thick steel

flat with a 12mm thick gusset plate to support an axial pull of 230kN for shop

fabrication. Also Specify Diameter of Rivets.

c. Write the steps to design an axially loaded column.

d. What are purlins?

e. Differentiate between Clear Span, Effective Span & Total span of a beam with

the help of sketches.

f. What are disadvantages of welding?

g. What are laterally restrained beams? Explain with Sketches.

h. How depth of Masonry wall foundation is decided?

SECTION-C


vi. Design a simply supported beam of span 4.0 m to carry a superimposed load of 55

kN/m inclusive of its self-weight. The beam is laterally restrained throughout its

length.(Assume missing Data)

vii. Write about various components of Roof Trusses (Minimum Ten).

viii. Design a Single angle discontinue strut of 2.0 m length to carry an axial compressive

load of 100 kN. With welded end connection using 10mm gusset plate.

(Assume missing Data)

ix. Design a 2.5m long Single angle section to act as tension member subjected to a

tensile load of 160kN. With Shop Riveted (PDSR) Connections at end. Assume

thickness of gusset plate.

x. Calculate the efficiency of Joint shown in Figure A. for shop Fabrication.






6th Exam/5130/Civil/Nov’18


Important Note: Use of IS: 800 and Steel Tables are permitted in examination.

SECTION-A


i. Permissible shear stress in weld is taken as_______

ii. A truss is usually loaded at the _____ of its members.

iii. Rivets in double cover butt joint are in ______shear.

iv. Joint in the length of column is known as ________

v. Outward deflection of web of an I=section is called as ______

vi. In welded joints, if size of weld is S, then the effective throat thickness is = ______

vii. Net area of the connected leg of single ISA is given by the relation _______

viii. Fe 410-S is designated for _______ grade of steel.

ix. Gross diameter of the rivet is the diameter of the ______

x. A line of rivets parallel to meeting edges of the members is called______


xi. Vertical stiffeners, in a plate girder, are required when d/t ratio > 85.

xii. If the nominal diameter of rivet is 20 mm then the gross diameter will become 22 mm.

Minimum size of weld recommended for 10 mm thick plate is 3 mm.

xiii. Effective length l = 0.7 L to 0.85 L for continuous strut member.

xiv. Columns with both ends fixed have effective length = 0.80 L.

SECTION-B

Q2. Attempt any six questions. 6x5=30

a. Give utility of plug and slot weld in welded connections.

b. Why net sectional area is increased more in riveting than in welding, to get the gross

area of tension members?

c. What are the factors governing the selection for the type of roof truss?

d. Write short note on stiffeners and their role in plate girders.

e. How would you differentiate between web buckling & web crippling incase of rolled

steel beams?

f. How depth and width of a brick wall foundation is decided.

g. Explain degree of indeterminacy with suitable example.

h. Draw a neat sketch showing the following terms:

i) Row of rivets ii) Staggered pitch iii) Edge distance iv) Gauge distance v) Row

of rivets

SECTION-C


i. Design a T-section to act as a tension member carrying an axial load of 220 kN.

Draw a neat sketch of the riveted end connection.

ii. In a roof truss, a tie member ISA 90 X 60 X 10 mm carries a pull of 125 kN. The tie

is connected to a 10 mm thick gusset plate by using end and side fillet welding.

Design the welded joint. Take permissible shear stress in weld as 108 N/mm2.

iii. Design a suitable ISHB to carry an axial load of 410 kN. The column is 5 m long and

is effectively held in position at both ends. But not restrained against rotation.

Assume the safe compressive stress = 80 MPa.

iv. Two plates 12 mm and 10 mm thick are joined by a triple riveted lap joint. Find the

suitable pitch for the outer row of rivets if the pitch for central row of rivets is half of



the pitch for outer rows. Take allowable (safe) tensile stress =150 N/mm2. Use Power

Driven Shop Rivets. Also find the efficiency of the joint.

v. Write short notes on the following.

a) Important considerations in fabrication and erecting of steel structures.

b) Tension splices




6th Exam/5130/Civil/May'18


Note: Use of IS: 800-1984 and steel tables are allowed

SECTION-A


i. ISSQ means…………….

ii. ISLC stands for………………..

iii. Rivets in double cover butt joints are in…………….shear.

iv. Lap, Tee or corner joints required……………….weld.

v. Members subjected to direct tension are called………………

vi. In compression members……………..area of section is used.

vii. A truss is usually loaded at the………………of its member

viii. Bending stress at the neutral axis is…………..

ix. The strength of beam is depends upon……….

x. Long columns fail due to……….


xi. Riveted butt joints have no cover plates.

xii. Welding requires skilled labour. xiii. In tension members, strength depends upon the

gross area..

xiii. Compression member of a crane is called boom.

xiv. In design of beams clear span is used for calculations.

SECTION-B

Q2. Attempt any six questions. 6x5=30 a. What are the type of failures occur in riveted joint?

b. Explain the advantages and disadvantages of welded joint?

c. What do you mean by structural steel? Explain its properties.

d. What are the different cases by which we can find the net area of the tension

members?

e. Define i) Radius of gyration ii) slenderness ratio iii) effective length

f. Draw a neat sketch showing various parts of roof truss.

g. Differentiate between long and short columns.

h. What are the assumptions made with theory of simple bending?

i. Write a short note on precautions to be taken for the erection of steel

structures.

SECTION-C

Q3. Attempt any three questions. 3x10=30 i. A double riveted cover butt joint is used for connecting two plates of 12 mm

thickness. The diameter of the rivets is 22 mm. Calculate the necessary pitch and

efficiency of the joint. Use

ii. PDSR. (τvf=100 N/mm2, σpf=300N/mm2.)

iii. iSA 75 X 50 X 10 mm is to be connected to a gusset plate by 6 mm fillet weld. The

load to be transmitted is 160 kN. Design the weld, Take τvf=102.5 N/mm2.

iv. Design the double angle member if the angles are placed back to back with their

longer legs connected on the same side of the gusset plate. The tension member is

subjected to a pull of 210 kN. Use 16mm PDSR,., τvf=100 N/mm2, σpf=300N/mm2,

σat=150 N/mm2. v. A simply supported beam carries a superimposed load of 3 kN/m on a clear span of

6.5 m. Design the beam section if the beam is laterally supported along its span.

vi. A single strut ISA 65 X 65 X 8 mm of a roof truss is 1.36m long. It is connected by

one rivet at each end. Calculate the safe load, the strut can carry. Refer steel table for

stresses etc.




6th Exam/Civil/5130/Nov'17


Note: Use of BIS 800 and steel table is permitted in the examination. Assume any data

suitably, not given.

SECTION-A

Q1. Fill in the blanks: 10x1.5=15 a. ISLB means…………………………..

b. Minimum pitch recommended is……………………times the diameter of

rivet hole.

c. The……………..of a fillet is the length of perpendicular from the right angle

corner o the hypotenuse.

d. The structural members carrying tension in a truss are called …………

e. Rivets in single cover butt joint are in ………………..shear.

f. The ratio of rise to the span is called ……………….of truss.

g. The maximum permissible shear stress is…………….times the yield stress of

steel.

h. In any tension member, in which a reversal of direct stresses due to load other

than wind or earthquake force occurs, the slenderness ratio should not

exceed………

i. The top line of the roof truss is called……….line.

j. …………….. Joint is one in which plates to be connected overlap each other.

SECTION-B Q2. Attempt any five questions. 5x6=30

i. What do you understand by failure of riveted joint? Enlist various manners

through which riveted joint can fail.

ii. Give stepwise procedure to design axially loaded column.

iii. How strength of a compression member is calculated?

iv. What do you understand by buckling of a column? Explain slenderness ratio.

v. Discuss elements of a plate girder.

vi. What are purlins? How can you decide spacing of purlins?

SECTION-C

Q3. Attempt any three questions. 10x3=30 a. A tie in a truss consist of a pair of angles ISA 90x60x8 mm welled on either

side of a gusset plate 10mm thick through the longer legs. Design the welded

joint if the permissible stress in angle and fillet welds is 150 MPa and 108

MPa respectively.

b. Design a UN equal angle section to act at a tie member 2m long in a roof truss

if it is to carry an axial load of 150KN. Use power driven rivets at joints.

c. Design a beam of effective span 8m to carry superimposed load of 50KN/M

inclusive of its self weight. The beam is laterally restrained.

d. A discontinuous strut having effective length 2m consist of two equal angles

ISA 50x50x6 mm it is connected to the opposite sides of gusset plates by two

rivets on each angle at two ends. Calculate the load carrying capacity of the

strut.




6th Exam/Civil/5130/May'17 Duration: 3 hrs M.Marks:75

Note: Use of IS:800-1984 and steel tables are allowed.

SECTION- (A)

Q1Fill in the blanks. 10×1 = 10

a) The edge distance in riveting should be greater than

b) A line of rivets parallel to the direction of stress is called as

c) Brittleness is often referred to as

d) A built up beam to carry heavier loads over large span is called a

e) The effective length of column depends upon

f) ISSQ 50 rolled section means

g) Struts are the members of roof trusses.

h) Roof beam supported by roof trusses is called as.

i) Lap, tee, or corner joints require type welds.

j) Strength of beam depends upon

(B) State True or False. 5×1=5

a) Side fillet welds are also called longitudinal fillet weld.

b) Plasticity is the extreme opposite to elasticity.

c) For mild steel, yield stress fy =350N/mm2

d) When one end is fixed, other hinged then effective length=0.65L

e) Bending stress at neutral axis is zero.

SECTION-B Q2. Short Answer Type. Attempt any six questions. 6×5=30

a) Explain the advantages and disadvantages of welding.

b) Explain the strength of riveted joint.

c) What are tacking rivets? Explain their purposes in steel structures.

d) Explain the purposes of structural steel used in engineering structures.

e) Explain the function of column bases in steel structures.

f) Explain various types of Angle Struts used in trusses.

g) Explain the detail of fixing purlin with principal rafter with sketches.

h) Explain the assumptions made in the theory of simple bending

i) Explain the important considerations in fabrication and erection of steel

structures.

SECTION-C

Long answer type. Attempt any three Questions. 3×10=30 Q.3 Find the suitable pitch for triple riveted lap joint for plates 12mm thick. Use PDSR

rivets. Take permissible tensile stress in plate = 150MPa. Determine the efficiency of the

joint also.

Q.4 Two channels [email protected]/m with flanges butting and welded toe to toe are to be

used as a column. The length of the column is 4 m and is restrained in position but not in

direction at both ends. Take fy =250N/mm2 Calculate the safe load that can carry the column.

Q.5 Design an unequal angle as a tie member 2m long, in a bridge to carry an axial load of

150kN.Using power driven rivets at joints. Allowable tensile stress = 150 N/mm2

Q.6 Calculate the safe load carrying capacity of a discontinuous double angle strut made up

of 2ISA100X75X6 mm. placed back to back on the same side of a gusset plate 8mm thick by

one rivet at ends. Center to center length of strut is 2.15m.

Q.7 Design a suitable section of steel beam having an effective span of 8m and which carries

the superimposed load of 40kN/m Take E = 2x105N/mm2 Apply the checks for shear and

deflection.



STEEL STRUCTURE DESIGN

6th Exam /5130/4651/Civil/Nov' 2016

Duration: 3Hr M. Marks 75

Important note: Use of IS: 800 and steel Tables are permitted in exam

SECTION-A

Q1. Fill in the Blanks. 15x1=15

1. ______ is the property by which a metal can be drawn into thin wires without

breaking.

2. The size of rivet can be determined by the formula _______

3. The effective throat thickness for fillet weld is ________

4. The compression member of a roof truss is called _________

5. The slenderness ratio ƛ in column is given by ƛ =__________

6. If the nominal dia. of the rivet is 25mm then what is the gross dia._________

7. The least value of bearing and shearing strength of a rivet is called ________

8. The plate may fail in _______ if edge distance is not adequate.

9. The line of the rivets parallel to the direction of stress is called _________

10. The max. Size of the fillet weld for 10mm plate is _________ mm.

11. In laterally restrained beams the buckling of compression flange is prevented. (T/F)

12. Radius of gyration is given by =I min/A. (T/F)

13. A strut is a tension member.(T/F)

14. Effective throat thickness of a butt weld with partial penetration is 5/8xthickness of

Thinner plate.(T/F)

15. In a single riveted lap joint there is always one no. of rivet. (T/F)

SECTION-B

Q2. Attempt any five questions & all questions carry equal marks 6x5 = 30

1. What is shearing strength of a riveted joint?

2. What is rivet value?

3. Explain following terms;

(i) Size of a rivet (ii) Pitch of rivet (iii) Edge distance 4. What do you understand

by web buckling?

5. What are bearing stiffeners?

6. How are columns classified?

7. What are advantages of welded joint over riveted joints?

SECTION-C

Q3. Attempt any three questions & all questions carry equal marks 3x10 = 30

1. Two plates 12mm and 10mm thick are joined by a double riveted lap joint. The rivets

are 16mm in diameter and are provided at a pitch of 50mm, take permissible stresses

for rivet in shearing and bearing as 90Mpa and 270Mpa respectively. The permissible

tensile stress in plates is equal to 150 Mpa. Determine strength and efficiency of the

joint.

2. In a roof truss a tie member ISA 90x60x10mm carries a pull of 125KN. The tie is

connected to 10mm thick gusset plates by using end and side fillets. Design the

welded joint, ߬vf= 108N/mm2

3. Design a suitable section for a steel column to carry an axial load of 700kN. The

column is 7.5m long and restrained in position and direction at both ends. Yield stress

of steel = 250Mpa

4. The tension member of a roof truss carries an axial pull of 140kN. Design a single

angle section for 2m long member When it’s riveted at ends

takeߪat=150N/mm2,ߪpf=300N/mm2 and ߬vf= 108N/mm2

5. (a) Enlist the various components of a plate girder.

(b) Explain vertical and horizontal stiffeners of a plate girder.




6th/CIVIL/5130/4651/May’16

Duration: 3 hrs. M.Marks= 75

Note: Use of IS 800 and steel tables is permitted in the examination hall

SECTION A

Q.No.1. Fill in the blanks. 1.5x10=15

a. BIS Code for the design of steel structures is ………………………

b. The size of rivet is specify by diameter of ………………….. Of the rivet.

c. If the nominal diameter of the rivet is 25 mm, its gross diameter = ………………

d. The minimum pitch of the rivet is given by ……………………

e. The size of the fillet weld is specified by ………………………

f. Maximum size of fillet weld for connecting to plates of 10 mm thickness each is

……………

g. The permissible stress in axial tension for tension members is equal to………………

h. The permissible stresses in field driven rivets are …………………. Percent less than

those for shop driven rivets.

i. Slender ness ratio for a column is given by the ratio of effective length and ………….

j. The permissible deflection in case of a simply supported laterally restrained being of

effective Span L is given by …………………………

SECTION B

Q.No.2. Attempt any SIX questions. 6x5=30 a. What are the assumptions in the theory of riveted connections?

b. What are the merits of a welded joint over riveted joints?

c. How will you calculate the net affected area of a tension member using two

Angles placed back to back and connected on same side of the gusset plate?

d. Define the difference between net affective area and gross area and where each one of

them is used.

e. Define effective length, radius of gyration and slenderness ratio.

f. Write a short note on laterally restrained beams.

g. What is a plate girder? When they are used?

h. Define pitch, edge distance and gross diameter of rivet.

SECTION C

Q.No.3. Attempt any Two questions. 15x2=30

1. Design a riveted connection to connect 2 plates of 10 mm and 12 mm thickness using

IS 800 specifications.

2. Design a fillet welded joint to connect 2 plates of 200 mmx10mm and 180mm x8mm.

Take permissible stresses in axial tension and shear as 150 and 110 N/mm2

respectively.

3. Design a tension member to carry an axial load of 1000 KN. Also design the end

connection.

4. A discontinues angles strut consist of two ISA 90 x 60 x 8 placed back to back and

connected on both sides of 10 mm thick gusset plate by using a fillet weld.

Calculate its load carrying capacity.

5. Design a laterally restrained beam simply supported over a clear span of 4 meters and

carrying a super imposed load of 25 KN per meter throughout its span. The

permissible stress in bending compression is 165 N/mm2 and shear is 100 N/mm2.




6th/Civil/5130/Nov'15

Duration: 3 hrs M. Marks=75

Note: Use of IS: 800-1984 and steel tables are allowed.

SECTION-A

Q.1 (I) Fill in the blanks 10x1=10

a) Diameter of rivet is determined from formula

b) Effective throat thickness in fillet weld is

c) Permissible deflection for a steel beam is

d) A built up beam to carry heavier loads over large span is called a

e) Buckling exhibits the failure of member.

f) ISHB rolled sections are used for designing

g) Rise given to the bottom central panel of a roof truss is called

h) Rolled steel sections are designated by of its section and

i) Compression members in roof trusses are called

j) Splicing of the column is done to increase

(II)State True or False 5x1=5

a) The arrangement of triangles in a truss depends on span.

b) Unit of radius of gyration is mm2.

c) If the masonry wall is directly resting on foundation block, then B = 3t

d) Wrought iron is strong in compression.

e) Roof bracing is often necessary to provide stability.

SECTION-B

Q.2 Attempt any SIX questions. 6x5=30

i. What is a plate girder? What are its various components? Explain with sketch.

ii. Explain various forms of trusses with sketches.

iii. What do you understand by plug and slot welds?

iv. Explain any four rolled steel sections as per BIS.

v. Explain the terms slenderness ratio and radius of gyration.

vi. Explain various types of sections used as tension members.

vii. What are column bases and why these are used?

viii. What are laterally restrained beams?

SECTION-C

Q.3 Attempt any THREE Questions. 3x10=30

Q.3 Two plates 12 mm and 10 mm thick are joined by a double riveted lap joint. 16 mm Φ

rivets are provided at a pitch of 50 mm. Use PDSR rivets. Take permissible tensile

stress in plate = 150 MPa . Determine strength and efficiency of the joint .

Q.4 Design a suitable section for a steel column to carry an axial load of 660kN. The

length of the column is 7.5 m and is restrained in position and direction at

both ends. Take fy =250N/mm2

Q.5 Calculate the strength of ISA 100x65x8 mm used as a tie bar with longer leg

connected at ends by fillet welds. Allowable tensile stress = 150 N/mm2

Q.6 Design a single angle discontinuous strut 3m long to carry a load of 150kN. Also

design welded connections and use 10mm thick gusset plate. Take yield stress fy

=250N/mm2

Q.7 Design a suitable section of steel beam having an effective span of 6.5m loaded with

the

u.d.l. of 65kN/m (inclusive of self weight).Take E = 2x105N/mm2e girders




6th Exam/5130/4651/ Civil /May, 2015

Time: 3 Hrs. Max. Marks: 75

Important Note: Use of IS: 800 and Steel Tables are permitted in examination.

SECTION- A

Q1. (a) Fill in the blanks: 15 X 1 = 15

1. Fe 410-S is designated for………..grade of steel.

2. Gross diameter of the rivet is the diameter of the …………. .

3. A line of rivets parallel to meeting edges of the members is called………. .

4. In welded joints, if size of weld is S, then the effective throat thickness is = ………

5. Net area of the connected leg of single ISA is given by the relation ………….

(b) State True or False

1. Effective length l= 0.7 L to 0.85 L for continuous strut member.

2. Columns with both ends fixed have effective length = 0.65L.

3. Vertical stiffeners, in a plate girder, are required when d/t ratio > 85.

4. If the nominal diameter of rivet is 28 mm then the gross diameter will become 29.5

mm.

5. Minimum size of weld recommended for 8 mm thick plate is 5mm.

(c) Multiple Choice Questions:

1. For the same depth of member, the heavier section is

(a) ISWB (b) ISLB (c) ISMB (d) ISHB

2. For Power Driven Field Rivets, the value of shearing stress in N/mm2 is

(a) 80 (b) 90 (c) 100 (d) 270

3. For structures under fatigue stress, the preferred joint is

(a) Riveted (b) welded (c) both (d) none of these.

4. If fY is the minimum yield stress(in N/mm2) , then the permissible tensile stress is

given by the relation

(a) 0.4 fY (b) 0.5 fY (c) 0.6 fY (d) 0.7 fY

5. In a roof truss, the roofing material is supported by

(a) Bottom chord (b) purlins (c) principal rafter (d) none of these.

SECTION- B

Q2. Give briefly answers of any ten questions: 10 X 3 = 30

1. Explain degree of indeterminacy with suitable example.

2. Draw a neat sketch showing the following terms: (i) Row of rivets (ii) Staggered pitch

(iii) Edge distance

3. Why thickness of plate is taken as least of two plates, for strength calculations?

4. Give disadvantages of welded joints when compared to riveted joints.

5. Give utility of plug and slot weld in welded connections.

6. Why net sectional area is increased more in riveting than in welding, to get the gross

area of tension members?

7. Give IS: 800 specifications for tacking rivets, to be used in compression members.

8. Explain any two factors governing the selection for the type of roof truss.

9. Write the assumptions in the theory of simple bending in case of flexural members.

10. How would you differentiate between web buckling and web crippling in case of

rolled steel beams?

11. How depth and width of a brick wall foundation is decided.

12. Differentiate between lap joint and butt joint.

SECTION -C

Q3. Attempt any three questions: 3 X 10 = 30

1. Two plates 12mm and 10 mm thick are joined by a triple riveted lap joint. Find the

suitable pitch for the outer row of rivets if the pitch for central row of rivets is half of



the pitch for outer rows. Take allowable (safe) tensile stress =150 N/mm2. Use Power

Driven Shop Rivets. Also find the efficiency of the joint.

2. Design a T-section to act as a tension member carrying an axial load of 220 kN.

Draw a neat sketch of the riveted end connection.

3. Design a single angle discontinuous strut for a roof truss carrying a compressive load

of 80 kN. The length of the strut in between centre to centre is 3.5 m. Also design

welded end connection using 8mm thick gusset plate.

4. Design a suitable I- section for a steel column to carry an axial load of 750 kN. The

effective length of the column is 6m. Assume safe compressive stress = 80 N/mm2.

5. Write short notes on:

a) Important considerations in fabrication and erecting of steel structures

b) Use of vertical and horizontal stiffeners in plat


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