Question

Which one of the following statements is correct? The influence line diagram (ILD) for bending moment at a section in a cantilever is a triangle extending between the section and the

• A. fixed end with maximum ordinate under the fixed end
• B. unsupported end with maximum ordinate at the unsupported end
• C. unsupported end with maximum ordinate at the section
• D. fixed end with maximum ordinate under the section

Answer 1

The correct option is B unsupported end with maximum ordinate at the unsupported end



Introduce a pinned connection at C and give unit rotation. The ILD for bending moment at C is



So the ILD is the triangle between section and free end (unsupported end) with maximum ordinate at the unsupported end.