When loads are applied proportionately to a frame structure having its members in one plane, the structure is called
- Agrid frame
- Bplane frameCorrect
- Cspace frame
- Dtruss frame
Solution
Concept
A plane frame has all members and all loads in one plane.
Step-by-step solution
1. All members lie in one plane. 2. Loads also act in the same plane. 3. Such a structure is called a plane frame. 4. So the answer is (B).
Explanation
When all members and loads lie in a single plane, the structure is a plane frame. A space frame has members in three dimensions. A grid has loads acting perpendicular to its plane.
Why the other options are wrong
A: A grid has loads perpendicular to its plane. C: A space frame has members in 3D, not one plane. D: A truss has pin joints and axial forces only; the question asks for a frame with members in one plane.
Shortcut
Members and loads in one plane means plane frame.
Common mistake
Choosing grid frame, because a grid also has members in one plane, but its loads act normal to that plane.
Correct answer: B) plane frame