How beams of uniform section vary in section?

Beams of uniform section maintain a consistent cross-sectional shape and dimensions along their entire length, which ensures uniform strength and stiffness. However, when beams vary in section, they may change in shape, size, or material properties at different points, allowing for adjustments in load-bearing capacity and structural efficiency. This variation can help optimize material usage and reduce weight while maintaining necessary performance under specific loading conditions. Common examples include tapered beams or those with varying heights or widths to accommodate bending moments and shear forces more effectively.