Simply supported beam
A simply supported beam is a structural element that is supported at two points, typically at its ends. It is one of the most common types of beams used in construction and engineering.

Moment at the support
The moment at the support refers to the bending moment experienced by the beam at the point where it is supported. Bending moment is a measure of the internal forces that cause a beam to bend.

Maximum moment
The maximum moment in a simply supported beam occurs at the center of the beam span, where the beam is subjected to the highest bending forces. At this point, the beam experiences the greatest amount of bending and therefore the maximum moment.

Zero moment at the support
At the support points of a simply supported beam, the moment is always zero. This is because the beam is supported and restrained from rotating at these points. The support effectively prevents any bending moment from being transferred to the support.

Reasoning
The moment at the support is always zero because the support provides a reaction force that counteracts the bending moment in the beam. This reaction force prevents any rotation or bending from occurring at the support. As a result, the moment at the support is always zero.

Significance
Knowing that the moment at the support is always zero is important in the analysis and design of simply supported beams. It allows engineers to accurately determine the internal forces and stresses in the beam, which in turn helps ensure the structural integrity and safety of the beam.

Conclusion
In a simply supported beam, the moment at the support is always zero. This is due to the support providing a reaction force that counters the bending moment in the beam, preventing any rotation or bending at the support. Understanding this concept is crucial in the analysis and design of simply supported beams.