How do you design bending moment envelope?

To design a bending moment envelope, begin by determining the loading conditions and support reactions for the structural member using structural analysis methods. Next, calculate the bending moments at critical sections along the member's length under various loading scenariOS, such as dead loads, live loads, and environmental factors. Plot the maximum and minimum bending moments on a graph to visualize the envelope, which represents the range of moments that the structure will experience. Finally, use this envelope to ensure that the member's design conforms to strength and serviceability criteria.