The primary function of a foundation is to transfer the weight of the structure to the ground and provide stability against overturning and settlement.

Moment-resisting frames are commonly used for high-rise buildings due to their ability to resist lateral forces and provide stiffness to the structure.

Reinforcing steel is used in concrete structures to increase the tensile strength of concrete, which is weak in tension.

Ductility refers to the ability of a structure to undergo large deformations without losing its load-carrying capacity, which is crucial for resisting seismic forces.

Suspension bridges are characterized by a single, long span supported by cables that are anchored to towers.

The primary purpose of a retaining wall is to support soil and prevent landslides, especially in areas with steep slopes or unstable soil conditions.

Pile foundations are commonly used for structures built on soft or unstable soil because they transfer the load of the structure to deeper, more stable layers of soil.

Ultimate strength refers to the maximum force that a structural member can withstand before it fails and loses its load-carrying capacity.

Truss roofs are commonly used for large, open spaces because they can span long distances without the need for intermediate supports.

Expansion joints are provided in concrete structures to allow for thermal expansion and contraction of concrete, which can cause cracking if not accommodated.

All of the mentioned structural systems are commonly used for bridges, depending on factors such as span length, site conditions, and design requirements.

Lateral stability refers to the ability of a structure to resist lateral forces such as wind and earthquakes, which can cause the structure to sway or overturn.

Spread footings are commonly used for structures built on rock or hard soil because they distribute the load of the structure over a large area.

Shear walls are structural elements designed to resist lateral forces such as wind and earthquakes by transferring these forces to the foundation.

Gable roofs are commonly used for residential buildings due to their simple design, cost-effectiveness, and ability to shed water and snow efficiently.