PSBTE PAPER

## PSBTEPAPER.COM

Question Papers & Solutions

## SECTION-A

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.                                                                                                                                15×1=15

1. ISSQ means Indian Standard Square Bars.
2. ISLC standsfor Indian Standard Light Channels.
3. Rivets in double cover butt joints are in double.
4. Lap, Tee or corner joints required fillet
5. Members subjected to direct tension are called Tension member.
6. In compression members gross area of section is used.
7. A truss is usually loadedatthe joint of its member.
8. Bending stress at the neutral axis is Zero.
9. The strength of beam is depends upon Section Modulus.
10. Long columns fail due to Buckling.
##### b) State True or False.
1. Riveted butt joints have no coverplates. (False)
2. Welding requires skilled labour. (True)
3. In tension members, strength depends upon the grossarea. (False)
4. Compression member of a crane is calledboom. (True)
5. In design of beams clear span is used forcalculations. (False)

## SECTION-B

#### Q2. Attempt any five questions.                                                                    5×6=30

1. What are the type of failures occur in riveted joint?
3. What do you mean by structural steel? Explain its properties.
4. What are the different cases by which we can find the net area of the tension members?
5. Define i) Radius of gyration ii) slenderness ratio iii) effective length
6. Draw a neat sketch showing various parts of roof truss.
7. Differentiate between long and short columns.
8. What are the assumptions made with theory of simple bending?
9. Write a short note on precautions to be taken for the erection of steel structures.

## SECTION-C

#### Q3. Attempt any three questions.                                                       3×10=30

1. 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 PDSR. (τvf=100 N/mm2pf=300N/mm2.)
2. SA 75 X 50 X 10 mm is to be connected to a gusset plate by 6 mm fillet weld. The load tobe transmitted is 160 kN. Design the weld, Take τvf=102.5N/mm
3. 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 of210 kN. Use 16mm PDSR,.,τvf=100 N/mm2, σpf=300N/mm2, σat=150N/mm2.
1. 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.
2. A single strut ISA 65X65X8mm ofaro of truss is1.36mlong.It is connected by one rivet a teach end. Calculate the safe load, the strut can carry. Refer steel table for stresses etc.

## STEEL STRUCTURES DESIGN 6th Exam/Civil/5130/May 2018

### Section a :-STEEL STRUCTURES DESIGN 6th Diploma/Civil/5130/May 2019

According to IS 800:1984, Maximum Permissible tensile stress in Steel Sections is 0.6× fy.

In IS 800: 1984, Symbol fy represents minimum yield stress in Steel.

For 28mm diameter rivet, the diameter of rivet hole will be 28+2=30mm.

Sectional area of “ISLC 150 @ 141.3 N/m” is 1836 mm².

For 75° Fusion Angle the Effective throat thickness of 6mm welds is 2 mm.

Maximum pitch in rivets shall not exceed 30t or 300mm.

Increase in carbon content in steel cause  decrease ductility.

ΣV = 0, ΣH = 0 and ΣM = 0 are called equations of equilibrium.

In plate girder Bearing stiffeners are provided at the support.

Zero bending stress occurs at neutral axis of Beam.

(True)

(True)

(False)

(False)

(False)

### Section B :STEEL STRUCTURES DESIGN 6th Diploma /Civil/5130/May 2019

Lap Joint, Single Cover Butt Joint & Double cover Butt Joint with Riveted Connections.

Purlins

beams