A bending moment influence line
for any given point X on a structure is a line whose ordinate at any point B qives the bending moment
at X when a load is placed at B (keep reading it and look at the example below - it will make sense eventually!). Influence lines can be obtained for bending moments, shear forces
and reactions.
A bending moment influence line is drawn for one point only which may not necessarily be the point of maximum bending.
A bending moment diagram, by comparison with a influence line, will give the bending moment at all points for one position of load.
Example - Simply Supported Single Span
Influence Lines for Continuous Beam Example | Back to Tutorial Index
Last Updated : 10/06/06
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Email: david@childs-ceng.demon.co.uk