Correct Answer - Option 2 : Quarter span section
Concept-
When plate girders are longer the elements of their flanges, i.e., flange angles and flange plates may not be available in the required lengths so their splicing becomes necessary.
A joint in the flange element provided to increase the length of the flange angle or plate is known as flange splice.
In locating the flange splice, care should be taken to see that it is not located at the points of maximum stress.
The centre of gravity of the splice plate should be kept as close to the c.g. of the flange element spliced as possible.
There shall be enough rivets or welds on each side of the splice to develop the load in the element spliced plus 5 per cent, but in no case should the strength developed be less than 50 per cent of the effective strength of the material spliced.
In welded connection the flange splice is done through a full strength butt weld or through a single cover butt or double cover butt joint for the flange force at the section.
The flange splice in plate girders is preferably placed near about quarter span section.
