What are the two closely related structural frames used to resist lateral wind and earthquake loads?

The correct answer, which identifies the two closely related structural frames used to resist lateral wind and earthquake loads, highlights the importance of both braced frames and moment frames in ensuring a building's stability against these forces.

Braced frames consist of diagonal members that provide additional stiffness and strength, effectively helping to distribute lateral loads and prevent excessive sway during wind or seismic events. This configuration allows the structure to maintain its integrity while minimizing deformation.

Moment frames, on the other hand, rely on the rigid connections between beams and columns to resist lateral forces. In essence, they allow for the transfer of loads through bending, providing significant resilience against movements caused by wind or earthquakes.

Together, these two structural systems form a comprehensive approach to safeguarding buildings from lateral loads, illustrating their vital role in modern construction. The emphasis on both frames in the correct answer underscores how different structural strategies contribute to enhancing a building's overall stability in face of dynamic environmental forces.