Civil war-Day 27-LSGD-Steel structures intro.

ISMB 200 is a hot rolled Standard Indian Steel Section in which 200 indicates.

• Depth
• Width
• Weight
• Thickness

Answer explanation

ISMB numbers indicate the nominal depth in mm.

What is the value of permissible deflection for a steel structure generally?

• L/180
• L/240
• L/325
• L/500

Answer explanation

Permissible deflection is typically span/325 as per IS 800.

Which among the following is also known as rolled steel joist?

• Rolled steel T section
• Rolled steel Angle section
• Rolled steel Channel section
• Rolled steel I section

Answer explanation

RSJ refers to an I-section.

ISWB stands for

• Indian Standard Web Beam
• Indian Standard Wide Flange Beam
• Indian Standard Welded Beam
• None of these

Answer explanation

ISWB is Indian Standard Wide Flange Beam.

Stress at which steel fails under repeated application of loads

• Toughness
• Hardness
• Fatigue strength
• None of these

Answer explanation

Repeating/cyclic loading governs fatigue strength.

Which of the following is an incorrect statement?

• Steel sections are named according to their cross-section shape
• Different categories of standard steel shapes are formed by hot rolling and cold forming
• Rolled steel sections commonly available due to demand are called regular steel sections
• With increase in carbon content, tensile strength reduces but ductility increases

Answer explanation

Higher carbon increases strength but reduces ductility, so this is incorrect.

Designation of a rolled steel plate is

• ISLC
• ISP
• ISPL
• ISMB

Answer explanation

Rolled steel plates are designated as ISPL.

Steel structures are ideally suitable for impact loads because they have

• Plastic modulus
• Design stress
• Ductility
• Toughness value

Answer explanation

Impact resistance depends on toughness.

Partial safety factor of a material governed by yielding

• 1.25
• 1.1
• 1.5
• 1.0

Answer explanation

For yielding, γm0 = 1.1.

Which of the following sections are mostly used as columns?

• ISHB
• ISLB
• ISJB
• ALL OF THE ABOVE

Answer explanation

The section mostly used as columns is ISHB (Indian Standard Heavy Beams).