Reg No……………

14PMEST203KARPAGAM UNIVERSITY

(Under Section3 of UGC Act 1956) COIMBATORE-641 021

BE DEGREE EXAMINATION, April/May 2015. Civil Engineering

Sixth Semester 14PMEST203 -Design of steel structures (Use of IS 800:2007 and relevant tables are permitted) (assume missing data suitably)

Time 3 hours Maximum marks: 100Part-A

Answer all the questions (15 x 2 = 30 Marks)

1. Name the different types of connections?2. How the rolled steel beams are classified?3. What is a plug weld?4. Define tie member.5. Sketch the different forms of single section member6. What are the main objectives of the lug angles?7. Distinguish between the column and strut.8. What are the different types of column bases?9. Define the slenderness ratio.10. Mention the advantages of using rolled steel wide flange section as beams.11. What is a gantry girder?12. What is the meaning of web crippling?13. What are the factors to be considered in the designing of roof truss and why?14. What is meant by purlins?15. Define shoe angle.

Part-B(5 x 14 = 70 Marks)(Question No. 16 is compulsory-Unit-1)

16. a. Write about types of failures in tension members.(or)

b. Find the efficiency of the lap joint shown in the figure. Use M20 bolts of grade 4.6 and fe410 plates.

17. a. i)Find the tension capacity of single angle ISA 100x100x8 mm connected to gusset by means of three bolts of 22mm diameter at pitch of 80mm C/C in one line. Fy=250 Mpa.

ii) Explain the design procedure of tension members.

(Or)

b. Design a single angle section for a tension member of a roof truss to carry a factored tensile force of 225 KN. The member is subjected to the possible reversal of stress due to the action of wind. The effective length of the member is 3m. Use 20mm shop bolts of grade 4.6 for the connection.

18. a)A double angle discontinuous strut ISA 125x95x10 mm, longer legs are connected back to back on both sides of the gusset plate 10 mm thick with two bolts. The length of the Strut between centre to centre of intersection is 4m. Determine the safe load carrying capacity of the section.

(Or)

b) Design a laced column of 10 m long to carry a factored axial load of 1100 kN. The column is restrained in position but not in the direction at both ends. Provide single lacing system with bolted connection.

19. a) A Column of length 6m is buildup of an ISHB400 @822 N/m with two cover plates of 250mm x10mm size, one on each flange. The ends of the column are effectively held in position and restrained against rotation. The yield stress of steel used is 340 Mpa. Determine the load carrying capacity of the column section

(Or)

b) An ISHB300 @577 N/m section is used as a beam over a span of 7m with simply supported ends. Determine maximum factored Udl that the beam can carry, if the ends are restrained against torsion but compression flange is laterally un supported

20. a) Symmetric trusses of span 20 m and height 5 m are spaced at 4.5 m centre to centre. Design channel section purlins to be placed at suitable distances to resist the following

loads:Weight of sheeting including bolts = 171 kN/m2

Live load = 0.4 kN/m2

Wind load = 1.2 kN/m2

Spacing of purlins = 1.4 m.

(Or)

b) What are the components of a roof truss? Explain in detail with neat sketches.

Reg No……………14PMEST203

KARPAGAM UNIVERSITY(Under Section3 of UGC Act 1956)

COIMBATORE-641 021BE DEGREE EXAMINATION, April/May 2015.

Civil Engineering Sixth Semester

14PMEST203 -Design of steel structures (Use of IS 800:2007 and relevant tables are permitted) (assume missing data suitably)

Time 3 hours Maximum marks: 100Part-A

Answer all the questions (15 x 2 = 30 Marks)

1. Mention the advantages and disadvantages of welded connections?2. What is meant by gauge distance?3. What are the types of bolted connections?4. What is meant by throat thickness?5. How will you join the member of different thickness in a tension member?6. What is meant by Tension splice?7. What do you mean by compression members?8. What is meant for stanchions?9. What is a slab base?10. Why intermediate stiffeners are required for plate girder?11. What are the methods that are adopted to determine the flange design?12. What are laterally supported beams?13. Where the steel roof trusses are used?14. Sketch the various types of roof truss.15. What are the conditions that to be satisfied for the end supports?

Part-B(5 x 14 = 70 Marks) )(Question No. 16 is compulsory-Unit-1I)

16. a) Write shortly about types of failures in tension members.(Or)

b) Design the design tensile strength of the plate 130mm x 12mm with the holes for 16mm diameter bolts as shown in figure, steel used is of Fe415 grade quality.

17. a. . i) What are the advantages and disadvantages of welded connections?ii) A 18mm thick plate is joined to a 16mm plate by 200mm long(effective) butt weld. Determine the strength of joint if (a) A double V butt weld is used ; (b) A single V butt weld is usedAssume that Fe410 grade plates and shop welds are used.

(Or)b. i) What are the uses of mild steel?

ii) Explain about the different Properties of steel. iii) Explain briefly about the various types of loads to be considered in the design of steel

structures.

18. a. Design a rolled steel beam section column to carry an axial load of 1100 kN. The column is 4 m long and adequately restrained in position but not in the direction at both ends.

(Or)b. A column 4m long has to support a factored load of 6000 kN. The column is effectively held

at both ends and restrained in direction at one of the end. Design the column using beam sections and plates.

19. a. An ISHB 400 @ 77.4 kg/m section is used as a beam over a span of 7m with simply supported ends. Determine maximum factored Udl that the beam can carry, if the ends are restrained against torsion but compression flange is laterally un supported

(Or)b. A normal I section (symmetrical) plate girder is simply supported over a span pf 15 m carries

uniformly distributed load of 100 kN/m inclusive of its own weight. Design the section with the provisions for bearing stiffeners at the ends, intermediate vertical stiffeners and its welded connections and horizontal stiffeners and its connection.

20. a.The trusses for a factory building are spaced at 5m centre to centre and the purlins are spaced 2 m centre to centre. The pitch of the truss is ¼ and the span of roof truss is 12m.The vertical load from sheets etc., are 200 N/m2. While the wind loads on the truss surface Normal to roof is 1250 N/m2. Design

i) I section purlinii) Angle section purliniii) Channel purlin

(Or)b. What are the components in the crane system and write down the design steps for design of

gantry girders?

Reg No……………14PMEST203

KARPAGAM UNIVERSITY(Under Section3 of UGC Act 1956)

COIMBATORE-641 021BE DEGREE EXAMINATION, April/May 2015.

Civil Engineering Sixth Semester

14PMEST203 -Design of steel structures (Use of IS 800:2007 and relevant tables are permitted) (assume missing data suitably)

Time 3 hours Maximum marks: 100

Part-AAnswer all the questions

(15 x 2 = 30 Marks)

1. what are the advantages of high strength bolts?2. What is a rivet value?3. What is a slot weld?4. What is a single section member?5. What is a tension member? Write any four examples of tension member.6. What is the permissible stress in axial tension?7. What are the different modes of failures in colum?8. What are the thickness of single and double lacing bars used in the design of

columns?9. State the purpose of using column base.10. What is a beam?11. What do you mean by curtailment of flanges?12. What is the economical depth of a plate girder?13. Mention the advantages of a roof truss.14. Name the types of roofing systems.15. Write the equation for calculating the design wind pressure.

Part-B(5 x 14 = 70 Marks) (Question No. 16 is compulsory-Unit-1II)

16. a) Determine the design axial load capacity of the column ISHB300@577N/m if the length of column is 3m and its both ends are pinned.

(or)b) What are the usual steps in the design of compression members?

17. a. Find the efficiency of the butt joint shown in the figure. Use M20 bolts of grade 4.6 and fe410 plates.

(Or)b. A tie of roof truss consists of an angle section ISA 65x65x6 mm welded to 8 mm thick

gusset plate. Design a weld to transmit a load equal to the full strength of the member.

18. a. A single unequal angle 100x75x6 is connected to a 10mm gusset plate at the ends with 5 nos. of 16mm diameter bolts to transfer tension. The gauge and pitch distances are 60 mm and 40 mm respectively. Determine the tensile strength of the angle assuming that the yield and ultimate stress of steel used are 250 Mpa and 410 Mpa, if the gusset is connected to the 100mm leg.

(Or)b i) Write shortly about different types of tension members.

ii) Determine the design tensile strength of the plate 160mm x 8mm with the holes for 16mm diameter bolts as shown in figure, steel used is of Fe415 grade quality.

19. a. A roof of a hall measuring 8 m x 12 m consists of 100 mm thick R.S slab supported on steel I-beams of 8 m clear span, spaced 3 m apart. The finishing load may be taken as 1.5 kN/m2 and live load as 1.5 kN/m2 .Design the steel beam.

(Or)

b. Design a laterally unrestrained beam of length 4.5m. Maximum bending moment is 500 kNm and Maximum shear force = 250 kN. Use Fe 410 grade steel.

20. a. Design a purlin on sloping roof truss with the dead load of 0.15 kN/m2 (cladding and insulation), a live load of 2 kN/m2 and wind load of 0.5 kN/m2 (suction). The purlins are 2 m centre to centre and of span 4m, simply supported on a rafter at a slope of 20 degree. Provide channel section purlin.

(Or)

b..(i) Explain about the components of a crane systems with neat sketch. (ii) Explain about the different loads which are considered at the time of designing of roof

trusses.

Reg No……………14PMEST203

KARPAGAM UNIVERSITY(Under Section3 of UGC Act 1956)

COIMBATORE-641 021BE DEGREE EXAMINATION, April/May 2015.

Civil Engineering Sixth Semester

14PMEST203 -Design of steel structures (Use of IS 800:2007 and relevant tables are permitted) (assume missing data suitably)

Time 3 hours Maximum marks: 100Part-A

Answer all the questions (15 x 2 = 30 Marks)

1. Write the formula for calculating the efficiency of the joint in lap weld.2. What are the different series of rolled steel I sections manufactured in India?3. Define permissible stress and Working stress.4. Under which circumstances you are selecting a Built-up members?5. What is a net sectional area of tension member?6. What is the allowable stress in axial tension for channel section?7. When the slenderness ratio of compression member increases, the permissible

stressdecreases. Why?

8. What is the purpose of providing battens in compound steel columns?9. What are the advantages of cover plate?10. How the beams are failed? 11. What are the permissible stresses used in the beams?12. Mention the basic design assumptions of a plate girder.13. How the trusses are classified according to the pitch?14. What is a panel point?15. What is a drag force?

Part-B(5 x 14 = 70 Marks) (Question No. 16 is compulsory-Unit-1V)

16. a) An ISMB500 section is used as a beam over a span of 6m, with simply supported ends. Determine the maximum factored UDL that the beam can carry if the ends are restrained against torsion but compression flange is laterally unsupported.

(or) b) Briefly explain step by step procedure for design of channel section purlins.

17. a. Design a but joint to connect two plates 180mm x 10 mm using 20mm diameter common

bolts. Arrange the bolts to give maximum efficiency. What is the efficiency of joint?

(Or)

b. i) Explain about the different types of connections in the steel structures? ii) What are advantages and disadvantages of bolted connections over the welded

connection?

18. a. A single unequal angle 90x60x6 is connected to a 8 mm gusset plate at the ends with four 20mm diameter bolts to transfer tension. The gauge and pitch distances are 60 mm and 40 mm respectively. Determine the design tensile Strength of the angle. Assume that the yield and the ultimate stress used are 250 Mpa and 410 Mpa respectively.

(Or)

b. Design a single angle section for a tension member of a roof truss to carry a factored tensile force of 200 KN. The member is subjected to the possible reversal of stress due to the action of wind. The effective length of the member is 3m. Use 20mm shop bolts of grade 4.6 for the connection.

19. a. Design a single angle strut connected to the gusset plate to carry 180 kN factored load. Thelength of the strut between centre to centre intersection is 3m.

(Or)

b. A column consisting of ISHB 400 @ 77.4 kg/m carries on axial load of 670 kN and a bending moment of 120 kNm in the plane web. Design the base for the column with a provision of anchor bolts to resist bending moment. The grade of concrete pedestal under the base plate is M20.

20. a. Determine the design loads on the purlins of an industrial building near visagapatnam,Given,

Class of building: General with life of 50 years.Terrain: Category 2. Maximum dimension: 40 mWidth of building: 15 m Height at eve level: 8 mTopography: Ѳ less than 3◦ Permeability: mediumSpan of truss: 1.5 mPitch: 1/5 Sheeting: A.C SheetsSpacing of purlins: 1.35 m Spacing of trusses: 4 m

(Or)

b. i) Explain about different types of roof trusses with neat sketch . ii) Write down the design procedure for design of purlins.

Reg No……………14PMEST203

KARPAGAM UNIVERSITY(Under Section3 of UGC Act 1956)

COIMBATORE-641 021BE DEGREE EXAMINATION, April/May 2015.

Civil Engineering Sixth Semester

14PMEST203 -Design of steel structures (Use of IS 800:2007 and relevant tables are permitted) (assume missing data suitably)

Time 3 hours Maximum marks: 100

Part-AAnswer all the questions

(15 x 2 = 30 Marks)

1. What are the different modes of failure of a riveted joint?2. State the common defects in welding.3. What are Black bots? Where are they used?4. How the tension members are selected?5. What is a Lug angle?6. What will be the maximum pitch when the angles are placed back to back?7. Classify the columns according to the slenderness ratio.8. What is the minimum thickness of a batten plate?9. What is a boom?10. What do you mean by bending failure?11. Name the components of a plate girder.12. Why does buckling of web occurs in beams?13. Name the components of a roof truss.14. Why the bracings are provided in multi-storey steel structures?15. What is the permissible deflection where the electrically overhead cranes

operated over 500kN?

Part-B(5 x 14 = 70 Marks) (Question No. 16 is compulsory-Unit-V)

16. a) Symmetric trusses of span 20 m and height 5 m are spaced at 4.5 m centre to centre. Design channel section purlins to be placed at suitable distances to resist the following

loads:Weight of sheeting including bolts = 171 kN/m2

Live load = 0.4 kN/m2

Wind load = 1.2 kN/m2

Spacing of purlins = 1.4 m.

(or) b) Briefly explain step by step procedure for design of channel section purlins

17. a. Find the maximum force which can be transferred through the double covered butt joint shown in figure. Find the efficiency of the joint also. Use M20 bolts of grade 4.6 and Fe410 steel plates.

(Or)b. An ISA 75x75x6 acting as a tension member in a roof truss is connected to a gusset plate

8mm thick by welding. The member carries an axial factored load of 110 kN. Design the welded connection using site welds. Use Fe 410 grade steel.

18. a. Design a tension member to carry a factored tensile load of 400 kN. Two angles placed Back-to-back with long legs outstanding and desirable. The length of the member is 3m.Use Fe410 grade steel.

(Or)b. Design a single angle section for a tension member of a roof truss to carry a factored tensile

force of 300 KN. The member is subjected to the possible reversal of stress due to the action of wind. The effective length of the member is 4m. Use 20mm shop bolts of grade 4.6 for the connection.

19. a. Calculate the design compressive load for a stanchion ISHB 350, 4m high. The column is

fixed at both the ends. Use Fe 410 grade steel.(Or)

b. Design a single discontinuous strut to carry a factored axial compressive load of 70 kN. The length of the strut is 3m between intersections. It is connected to 12 mm thick gusset plate by 20 mm diameter 4.6 grade bolts. Use Fe 410 grade steel.

20. a. Design a laterally restrained simply supported beam of span 5 m. It carries a total udl of

40 kN/m (inclusive of self weight). Design an appropriate section using Fe410 grade Steel.(Or)

b. An ISMB300@577N/m section is used as a beam over a span of 5m, with simply supported ends. Determine the maximum factored UDL that the beam can carry if the ends are restrained

against torsion but compression flange is laterally unsupported.