Steel Structures Design Civil 6th Sem/5130/May 2015 Paper

STEEL STRUCTURES DESIGN 6th Diploma Exam/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]

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)

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/mm² 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/mm²) , 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)

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 ?

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 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/mm².
Write short notes on: a) Important considerations in fabrication and erecting of steel structures b) Use of vertical and horizontal stiffeners in plate girders.