The heaviest I-section for same depth is

Explanation:

Understanding I-Sections

I-sections, also known as rolled steel sections, are widely used in construction due to their high strength-to-weight ratio. The most common types of I-sections available are:

• ISMB: Indian Standard Medium Weight Beam

• ISLB: Indian Standard Light Weight Beam

• ISHB: Indian Standard Heavy Weight Beam

• ISWB: Indian Standard Wide Flange Beam

Key Characteristics of ISHB

Among the types mentioned, the ISHB (Indian Standard Heavy Beam) has the highest weight for the same depth. This is due to its design, which incorporates:

• Thicker flanges and webs, allowing for more material per unit length.

• Higher sectional modulus and moment of inertia, which contribute to its ability to bear heavier loads.

Analyzing the Given Options

1. Option 1: ISMB (Indian Standard Medium Beam)

   • This type of I-section is designed for medium loads and has a moderate weight. It is lighter than ISHB for the same depth.

2. Option 2: ISLB (Indian Standard Light Beam)

   • This is the lightest among the options, designed for light loads. It is not as heavy as ISHB.

3. Option 3: ISHB (Indian Standard Heavy Beam)

   • ISHB has the thickest flanges and webs, making it the heaviest I-section for the same depth.

4. Option 4: ISWB (Indian Standard Wide Flange Beam)

   • Although ISWB has wider flanges, it does not have the same weight as ISHB for the same depth.

Conclusion:

The correct answer is Option 3: ISHB, as it is the heaviest I-section for the same depth due to its design characteristics.