## STEEL STRUCTURES DESIGN

6th Diploma Exam/Civil/5130/May 2016

## STEEL STRUCTURES DESIGN **6**^{th} Exam/Civil/5130/May 2016

^{th}Exam/Civil/5130/May 2016

** 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. 10×1.5=15**

- BIS Code for the design of steel structures is
**IS 800:2007** - The size of rivet is specify by diameter
**of shank**of the rivet. - If the nominal diameter of the rivet is 25 mm, its gross diameter =
**25+1.5=26.5mm** - The minimum pitch of the rivet is given by =
**2.5XD** - The size of the fillet weld is specified by
**effective throat thickness**. - Maximum size of fillet weld for connecting to plates of 10 mm thickness each is
**3mm**. - The permissible stress in axial tension for tension members is equal to
**0.6fy** - The permissible stresses in field driven rivets are
**10%**Percent less than those for shop driven rivets. - Slender ness ratio for a column is given by the ratio of effective length and
**least value of radius of gyration**. - The permissible deflection in case of a simply supported laterally restrained being of effective Span L is given by
**l/325**.

## ** SECTION-B**

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

- What are the assumptions in the theory of riveted connections?
- What are the merits of a welded joint over riveted joints?
- 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?
- Define the difference between net affective area and gross area and where each one of them is used.
- Define effective length, radius of gyration and slenderness ratio.
- Write a short note on laterally restrained beams.
- What is a plate girder? When they are used?
- Define pitch, edge distance and gross diameter of rivet.

** SECTION-C**

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

Q3(a). Design a riveted connection to connect 2 plates of 10 mm and 12 mm thickness using IS 800 specifications.

(b) Design a fillet welded joint to connect 2 plates of 200 mm x 10mm and 180mm x8mm. Take permissible stresses in axial tension and shear as 150 and 110 N/mm2 respectively.

(c) Design a tension member to carry an axial load of 1000 KN. Also design the end connection.

Q4.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.

Q5. 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.

## STEEL STRUCTURES DESIGN 6th Exam/Civil/5130/May 2019

### Section a :-STEEL STRUCTURES DESIGN

6th Diploma/Civil/5130/May 2019

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

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

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

In IS 800: 1984, Symbol fy represents__ minimum yield __stress in Steel.

For 28mm diameter rivet, the diameter of rivet hole will be ________

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

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

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

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

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

Maximum pitch in rivets shall not exceed _______.

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

Increase in carbon content in steel cause _________.

Increase in carbon content in steel cause **decrease ductility**.

ΣV = 0, ΣH = 0 and ΣM = 0 are called ________.

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

In plate girder Bearing stiffeners are provided at ________.

In plate girder Bearing stiffeners are provided at **the support**.

Zero bending stress occurs at _________ of Beam.

Zero bending stress occurs at **neutral axis** of Beam.

##### b) State True or False.

**(True)**

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

**(True)**

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

**(False)**

Brittle Failure is not possible in Welding.

**(False)**

Strut is a member subjected to an axial Pull.

**(False)**

#### STEEL STRUCTURES DESIGN

6th Diploma Exam/Civil/5130/May 2019 PSBTE Diploma Solved Paper May 2019 .

### Section B :STEEL STRUCTURES DESIGN

6th Diploma /Civil/5130/May 2019

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

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.

What are purlins ?

Purlins

Differentiate between Clear Span, Effective Span & Total span of a beam with the help of sketches.

What are disadvantages of welding?

Disadvantages of welding

What are laterally restrained beams? Explain with Sketches ?

beams

How depth of Masonry wall foundation is decided?