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Consider the following statements: 1. The thickness of the gusset plate should not be more than the thickness of the structural members being connected. 2. A plate girder is essentially a beam and its moment of resistance depends upon its section modulus. 3. The function of the flanges in a plate girder is to resist the bending moment and hence their respective areas can be reduced near the supports of a simply supported beam. Which of the above statements are correct?

Consider the following statements: 1. The thickness of the gusset plate should not be more than the thickness of the structural members being connected. 2. A plate girder is essentially a beam and its moment of resistance depends upon its section modulus. 3. The function of the flanges in a plate girder is to resist the bending moment and hence their respective areas can be reduced near the supports of a simply supported beam. Which of the above statements are correct? Correct Answer 2 and 3 only 

Statement I: False

Gusset plate is the plate provided at ends of tension members through which the forces are transferred to the main member. It is usual practice to provide the thickness of the gusset plate equal or slightly higher than the members that are connected by the gusset plate.

Statement II: True

A plate girder is a built-up I-beam section, used to carry heavy loads which cannot be carried economically by rolled I-sections. It is made by riveting or welding the steel plates in the I-beam shape. It has only one web which is continuous throughout the length of a plate girder. Its moment carrying capacity is given as

M = fy Z

Where Z is the section modulus and fy is the yield stress.

Statement III: True

In plate girder, the following assumptions are made:

1. Bending stress in flanges is resisted by flange plates. At supports bending moment is zero or very less, hence, reducing the area at supports leads to the economical design of plate girder.

2. Vertical shear force is resisted by the web.

3. Web buckling is resisted either by increasing thickness of the web or by providing vertical stiffeners.

4. The horizontal shear force between the flange and the web plate is resisted by fillet welding.

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