Bending moment diagram for top chord of main truss

Question

Accepted Answer

The bending moment diagram for the top chord of a main truss shows the variation of bending moment along the length of the chord.

The diagram is typically plotted with the bending moment on the y-axis and the distance along the chord on the x-axis.
The bending moment is usually highest at the supports and lowest at the center of the span.
The shape of the diagram depends on the loading and support conditions of the truss.
The diagram can be used to determine the maximum bending moment and corresponding stress in the chord.
The design of the chord section and material can be optimized based on the bending moment and stress.
Example: A truss bridge with a uniform load will have a parabolic bending moment diagram.
Example: A truss with a concentrated load at the center will have a triangular bending moment diagram.

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