Which type of rigid frame configuration decreases bending stresses and enhances compression efficiency?

The gabled frame configuration is effective in decreasing bending stresses and enhancing compression efficiency due to its inherent geometric properties. When a gabled frame is subjected to loads, particularly vertical loads from the roof or superstructure, the sloped nature of the gable directs these forces downward along the sloped rafters, which minimizes lateral bending moments. This direct load path ensures that the structural elements primarily experience axial loading rather than bending.

Moreover, the triangular shape formed by the gabled frame is highly efficient for resisting forces. Triangles are inherently stable shapes, which allow the frame to distribute loads evenly across its members. This stability helps to limit the bending stresses that can be introduced by wind or snow loads. The design allows for a more efficacious use of materials, as the compression forces are carried through the sloped rafters to the support columns with minimal deflection.

This configuration is especially advantageous in conditions where wind loads can induce lateral bending in structures, as the sloped roof helps to shed these forces rather than allow them to build up within the frame.

In contrast, flat frames typically do not provide the same level of efficiency in compression and can lead to higher bending stresses due to the horizontal nature of their members. Arched frames can enhance compression but might