## STEEL STRUCTURES DESIGN 6th Diploma Exam/Civil/5130/May 2015

## STEEL STRUCTURES DESIGN **6**^{th} Exam/Civil/5130/May 2015

^{th}Exam/Civil/5130/May 2015

** SECTION-A**

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

- Fe 410-S is designated for
grade of Steel.__Standard quality steel__ - Gross diameter of the rivet is the diameter of the
.__hole__ - A line of rivets parallel to meeting edges of the members is called
__row of rivets__. - In welded joints, if size of weld is S, then the effective throat thickness is =
__7S__ - Net area of the connected leg of single ISA is given by the relation
__=__**[length of leg-thickness/2-nd]**

### (b) State True or False

- Effective length l= 7 L to 0.85 L for continuous strut member.
**(True)** - Columns with both ends fixed have effective length = 65L.
**(True)** - Vertical stiffeners, in a plate girder, are required when d/t ratio > 85.
**(True)** - If the nominal diameter of rivet is 28 mm then the gross diameter will become 29.5 mm.
**(False)**

- Minimum size of weld recommended for 8 mm thick plate is
**(False)**

### (c) Multiple Choice Questions:

- For the same depth of member, the heavier section is
- a) ISWB (b) ISLB (c) ISMB (d) ISHB

Ans – (d)

- For Power Driven Field Rivets, the value of shearing stress in N/mm
^{2}is (a) 80 (b) 90 (c) 100 (d) 270

Ans- (b)

- For structures under fatigue stress, the preferred joint is
- Riveted (b) welded (c) both (d) none of

Ans- (a)

- If f
_{Y}is the minimum yield stress(in N/mm^{2}) , then the permissible tensile stress is given by the relation

(a) 0.4 f_{Y} (b) 0.5 f_{Y} (c) 0.6 f_{Y} (d) 0.7 f_{Y}

Ans- (c)

- In a roof truss, the roofing material is supported by
- Bottom chord (b) purlins (c) principal rafter (d) none of

Ans- (b)

## ** SECTION-B**

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

** **

- Explain degree of indeterminacy with suitable Example ?
- Draw a neat sketch showing the following terms: (i) Row of rivets (ii) Staggered pitch (iii) Edge distance

- Why thickness of plate is taken as least of two plates, for strength calculations?
- Give disadvantages of welded joints when compared to riveted
- Give utility of plug and slot weld in welded
- Why net sectional area is increased more in riveting than in welding, to get the gross area of tension members?
- Give IS: 800 specifications for tacking rivets, to be used in compression
- Explain any two factors governing the selection for the type of roof
- Write the assumptions in the theory of simple bending in case of flexural
- How would you differentiate between web buckling and web crippling in case of rolled steel beams?
- How depth and width of a brick wall foundation is
- Differentiate between lap joint and butt Joint ?

** SECTION-C**

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

- 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/mm
^{2}. Use Power Driven Shop Also find the efficiency of the joint. - Design a T-section to act as a tension member carrying an axial load of 220 Draw a neat sketch of the riveted end connection.
- Design a single angle discontinuous strut for a roof truss carrying a compressive load of 80kN. The length of the strut in between centre to centre is 3.5 m. Also design welded end connection using 8mm thick gusset
- Design a suitable I- section for a steel column to carry an axial load of The effective length of the column is 6m. Assume safe compressive stress = 80 N/mm
^{2}. - Write short notes on: a) Important considerations in fabrication and erecting of steel structures b) Use of vertical and horizontal stiffeners in plate girders.

### Section a :-STEEL STRUCTURES DESIGN 6th Diploma/Civil/5130/May 2015

Fe 410-S is designated for ** Standard quality steel** grade of Steel.

Gross diameter of the rivet is the diameter of the ** hole**.

A line of rivets parallel to meeting edges of the members is called __row of rivets__.

In welded joints, if size of weld is S, then the effective throat thickness is = __7S__

Net area of the connected leg of single ISA is given by the relation__= [length of leg-thickness/2-nd]__

### (b) State True or False

Ans- (a)Riveted

#### STEEL STRUCTURES DESIGN

6th Diploma Exam/Civil/5130/May 2019 PSBTE Diploma Solved Paper May 2015 .

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

Degree of indeterminacy with suitable Example

(i) Row of rivets

(ii) Staggered pitch

(iii) Edge distance

Differentiate between lap joint and butt Joint

#### STEEL STRUCTURES DESIGN

6th Diploma/Civil/5130/May 2015 Click Here

### Section c STEEL STRUCTURES DESIGN 6th Diploma/Civil/5130/May 2015

a) Important considerations in fabrication and erecting of steel structures

b) Use of vertical and horizontal stiffeners in plate girders.

##### STEEL STRUCTURES DESIGN

6th Diploma/Civil/5130/May 2015 **Contact Us**

### 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.

#### 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.

Purlins

Disadvantages of welding